{"id":219,"date":"2026-04-03T03:28:48","date_gmt":"2026-04-03T03:28:48","guid":{"rendered":"https:\/\/hxcnc.com\/?page_id=219"},"modified":"2026-05-14T05:54:03","modified_gmt":"2026-05-14T05:54:03","slug":"cast-iron-cnc-machining","status":"publish","type":"page","link":"https:\/\/hxcnc.com\/ru\/cast-iron-cnc-machining\/","title":{"rendered":"\u041e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u043b\u0430\u0442\u0443\u043d\u0438 \u043d\u0430 \u0427\u041f\u0423"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"219\" class=\"elementor elementor-219\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4c1b420 e-con-full e-flex e-con e-parent\" data-id=\"4c1b420\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f543df2 elementor-widget elementor-widget-html\" data-id=\"f543df2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<!-- FAQ Structured Data -->\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is cast iron and why is it used for CNC machining?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Cast iron is a family of iron-carbon alloys with carbon content greater than 2% (typically 2.5\u20134.5%), which causes the excess carbon to precipitate as graphite or iron carbide during solidification. This microstructure gives cast iron its defining characteristics: excellent compressive strength, outstanding vibration damping, inherent lubricity from graphite, and very good machinability despite its hardness. Cast iron is widely used for machine tool bases, engine blocks, pump housings, brake components, and heavy-duty structural parts where rigidity, wear resistance, and dimensional stability are required. Its machinability is significantly better than alloy steels of comparable hardness.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is gray cast iron and what are its main applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Gray cast iron (also written grey cast iron) is the most widely used cast iron grade, characterized by graphite precipitating as flake graphite within a pearlitic or ferritic iron matrix. The gray fracture surface appearance gives it its name. Common grades include ASTM A48 Class 20\u201340, ISO EN-GJL-150 to EN-GJL-300, and Chinese GB HT150\u2013HT350. Gray cast iron offers outstanding machinability (self-lubricating from graphite flakes), excellent vibration damping, good compressive strength, and low cost. It is used for engine blocks, cylinder heads, machine tool bases, brake drums, pump bodies, and gearbox housings. Its tensile strength is moderate (150\u2013350 MPa) but compressive strength is 3\u20135 times higher.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is ductile cast iron (nodular iron) and how does it differ from gray cast iron?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Ductile cast iron (also called nodular iron or spheroidal graphite iron, SG iron) is produced by adding magnesium or cerium to the melt, which causes graphite to solidify as spherical nodules rather than flakes. This transformation dramatically improves tensile strength (400\u2013900 MPa), yield strength, elongation (up to 18%), and impact resistance compared to gray cast iron \u2014 giving properties approaching those of steel while retaining excellent machinability. Common grades include ASTM A536 Grade 65-45-12, 80-55-06, and 100-70-03; ISO EN-GJS-400-18 to EN-GJS-700-2. Ductile iron is used for crankshafts, gears, differential housings, hydraulic valve bodies, and structural components that require both the machinability of cast iron and higher mechanical strength.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is alloy cast iron and when should it be specified?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Alloy cast iron is cast iron with deliberate additions of chromium, nickel, molybdenum, copper, or vanadium to improve specific properties beyond those of standard gray or ductile iron. Common types include high-chromium white iron (for extreme wear resistance in mining and crushing equipment), Ni-Hard iron (nickel-chromium white iron, extremely hard HRC 55+), and austenitic cast irons such as Ni-Resist (for corrosion and heat resistance up to 800\u00b0C). Alloy cast irons are specified when standard cast irons fail due to abrasive wear, elevated temperature, or corrosive service. They are significantly harder to machine than gray or ductile iron and require carbide tooling with conservative parameters.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What are the main machining challenges with cast iron?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Cast iron machining presents several specific challenges: (1) Hard skin \u2014 the as-cast surface contains scale, sand inclusions, and a hard chilled layer that rapidly destroys tooling if the first pass does not cut below it. The first pass must be deep enough to clear the skin entirely. (2) Abrasive graphite \u2014 graphite flakes are highly abrasive despite providing lubrication; they accelerate flank wear on carbide tools. (3) Dry or near-dry machining \u2014 unlike steel, cast iron is often machined dry or with minimum quantity lubrication (MQL) because coolant can cause thermal shock cracking in some alloy iron grades, and flooding can wash abrasive particles back into cuts. (4) Porosity \u2014 internal voids in castings can cause dimensional surprises when machined to thin walls. (5) Alloy iron hardness variation \u2014 alloy cast irons can vary significantly in hardness across a single casting due to cooling rate differences.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What tolerances can you hold on cast iron CNC machined parts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Standard CNC machining tolerance for gray and ductile cast iron is \u00b10.02 mm for turned features and \u00b10.05 mm for milled features. For precision bearing bores and sealing faces, we hold \u00b10.010\u20130.015 mm on gray and ductile iron. Alloy cast iron (particularly high-chromium white iron) has higher hardness variability and typically achieves \u00b10.02\u20130.03 mm on machined features. Note that castings themselves have inherent dimensional variation \u2014 datum selection and fixturing strategy must account for casting dimensional variability before machining begins. We offer first article inspection (FAI) with CMM report on all precision cast iron components.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does cast iron need surface treatment after machining?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Cast iron has limited inherent corrosion resistance \u2014 the graphite and iron matrix can corrode in humid or wet environments. Surface treatment depends on application: machine tool bases and internal components are often supplied with a coat of rust-preventive oil only. Parts in moderate environments receive black oxide, phosphate coating, or zinc plating. Pump bodies and valve housings in wet service receive epoxy paint, powder coating, or zinc electroplating. High-temperature alloy cast iron parts may be coated with high-temperature paint or left uncoated. Gray cast iron should not be electroplated with acid processes without proper pre-treatment as the graphite flake network can trap hydrogen and cause blistering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can cast iron be welded or heat treated after machining?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Cast iron welding is possible but requires specialized procedures. Gray cast iron must be preheated to 300\u2013600\u00b0C before welding to prevent heat-affected zone cracking (gray iron is brittle and thermal gradients cause cracking). Nickel-based or cast iron welding rods are used. Ductile iron is more weldable than gray iron but still requires preheat. Alloy cast irons vary \u2014 high-chromium white irons are generally considered unweldable. For heat treatment: gray cast iron can be stress-relieved (550\u2013600\u00b0C) to reduce residual casting stresses before precision machining. Ductile iron can be annealed to soften or normalized\/quenched and tempered to increase hardness. Always consult your metallurgist before welding or heat treating cast iron components.\"\n      }\n    }\n  ]\n}\n<\/script>\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Roboto:wght@300;400;500;700;900&family=Roboto+Condensed:wght@400;700;900&family=Roboto+Mono:wght@400;500&display=swap\" rel=\"stylesheet\">\n\n<style>\n\/* \u2500\u2500 Namespace: .CIR \u2500\u2500 *\/\n.CIR{\n  --bg:#F7F9FC;--bg-white:#FFFFFF;--bg-light:#EEF3F8;\n  --text-1:#1F2937;--text-2:#5B6777;--text-3:#9CA8B4;\n  --border:#D7E0EA;\n  --blue:#2563EB;--blue-h:#1D4ED8;\n  --blue-dim:rgba(37,99,235,0.08);--blue-mid:rgba(37,99,235,0.15);\n  --teal:#0F766E;--teal-dim:rgba(15,118,110,0.08);--teal-border:rgba(15,118,110,0.2);\n  \/* Cast Iron accent \u2014 warm charcoal *\/\n  --ci:#44403C;\n  --ci-mid:#292524;\n  --ci-dim:rgba(68,64,60,0.07);\n  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img{width:100%;height:100%;object-fit:cover;transition:transform 0.45s;}\n.CIR .cgc:hover .cgc-img img{transform:scale(1.04);}\n.CIR .cgc-badge{position:absolute;top:14px;left:14px;padding:6px 14px;border-radius:100px;font-family:var(--ff-m);font-size:11px;font-weight:700;letter-spacing:.8px;text-transform:uppercase;}\n.CIR .cgcb-gray{background:var(--gray);color:#fff;}\n.CIR .cgcb-duct{background:var(--duct);color:#fff;}\n.CIR .cgcb-alloy{background:var(--alloy);color:#fff;}\n\n.CIR .cgc-body{padding:24px;display:flex;flex-direction:column;flex:1;}\n.CIR .cgc-grade{font-family:var(--ff-m);font-size:26px;font-weight:700;line-height:1;margin-bottom:4px;}\n.CIR .cgc-std{font-family:var(--ff-m);font-size:10px;color:var(--text-3);letter-spacing:1.5px;text-transform:uppercase;margin-bottom:8px;}\n.CIR .cgc-name{font-family:var(--ff-h);font-size:14px;font-weight:700;color:var(--text-1);margin-bottom:10px;}\n.CIR 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tr{border-bottom:1px solid var(--border);}\n.CIR .cgc-comp-table tr:last-child{border-bottom:none;}\n.CIR .cgc-comp-table td{padding:5px 0;font-size:11px;}\n.CIR .cgc-comp-table td:first-child{color:var(--text-3);font-family:var(--ff-m);font-size:10px;letter-spacing:.8px;text-transform:uppercase;width:55%;}\n.CIR .cgc-comp-table td:last-child{font-weight:700;text-align:right;}\n\n.CIR .cgc-grades-list{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:14px;}\n.CIR .cgc-grade-tag{padding:3px 9px;border-radius:100px;font-family:var(--ff-m);font-size:10px;font-weight:600;}\n\n.CIR .cgc-props{display:flex;flex-direction:column;gap:5px;margin-bottom:14px;}\n.CIR .cgc-prop{display:flex;align-items:flex-start;gap:7px;font-size:11px;color:var(--text-2);line-height:1.5;}\n.CIR .cgc-dot{width:5px;height:5px;border-radius:50%;flex-shrink:0;margin-top:4px;}\n.CIR .cgc-uses{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:14px;}\n.CIR .cgc-use{padding:2px 8px;border-radius:100px;background:var(--bg-light);border:1px solid var(--border);font-family:var(--ff-m);font-size:10px;color:var(--text-3);}\n.CIR .cgc-link{display:inline-flex;align-items:center;gap:5px;font-family:var(--ff-h);font-size:11px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;margin-top:auto;}\n.CIR .cgc-link::after{content:'\u2192';}\n.CIR .cgl-gray{color:var(--gray);}\n.CIR .cgl-duct{color:var(--duct);}\n.CIR .cgl-alloy{color:var(--alloy);}\n\n\/* \u2500\u2500 WHEN TO USE \u2500\u2500 *\/\n.CIR .cwhen-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;}\n@media(max-width:900px){.CIR .cwhen-grid{grid-template-columns:1fr;}}\n.CIR .cwhen-card{padding:22px;border-radius:var(--r3);border:1.5px solid var(--border);background:#fff;transition:all 0.2s;}\n.CIR .cwc-gray{border-color:var(--gray-border);}\n.CIR .cwc-gray:hover{border-color:var(--gray);box-shadow:0 8px 24px rgba(107,114,128,0.1);}\n.CIR .cwc-duct{border-color:var(--duct-border);}\n.CIR .cwc-duct:hover{border-color:var(--duct);box-shadow:0 8px 24px rgba(180,83,9,0.1);}\n.CIR .cwc-alloy{border-color:var(--alloy-border);}\n.CIR .cwc-alloy:hover{border-color:var(--alloy);box-shadow:0 8px 24px rgba(124,58,237,0.1);}\n.CIR .cwc-head{font-family:var(--ff-h);font-size:13px;font-weight:700;color:var(--text-1);margin-bottom:10px;display:flex;align-items:center;gap:8px;}\n.CIR .cwc-ico{width:24px;height:24px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:12px;flex-shrink:0;}\n.CIR .cwc-list{display:flex;flex-direction:column;gap:5px;}\n.CIR .cwc-item{display:flex;align-items:flex-start;gap:6px;font-size:11px;color:var(--text-2);line-height:1.5;}\n\n\/* \u2500\u2500 COMPARISON TABLE \u2500\u2500 *\/\n.CIR .ccmp-wrap{overflow-x:auto;}\n.CIR .ccmp-table{width:100%;border-collapse:collapse;border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;min-width:680px;}\n.CIR .ccmp-table thead th{padding:11px 14px;background:var(--bg-light);font-family:var(--ff-h);font-size:11px;font-weight:700;color:var(--text-3);letter-spacing:.5px;text-transform:uppercase;text-align:left;border-bottom:1.5px solid var(--border);}\n.CIR .ccmp-table thead th:nth-child(2){color:var(--gray);}\n.CIR .ccmp-table thead th:nth-child(3){color:var(--duct);}\n.CIR .ccmp-table thead th:nth-child(4){color:var(--alloy);}\n.CIR .ccmp-table thead th:nth-child(5){color:var(--text-3);}\n.CIR .ccmp-table tbody td{padding:11px 14px;font-size:12px;color:var(--text-2);border-bottom:1px solid var(--border);vertical-align:top;}\n.CIR .ccmp-table tbody tr:last-child td{border-bottom:none;}\n.CIR .ccmp-table tbody tr:hover td{background:var(--bg-light);}\n.CIR .ccmp-table tbody td:first-child{font-family:var(--ff-m);font-size:10px;color:var(--text-3);letter-spacing:1px;text-transform:uppercase;white-space:nowrap;font-weight:500;}\n\n\/* Stars *\/\n.CIR .cstars-gray{color:var(--gray);}\n.CIR .cstars-duct{color:var(--duct);}\n.CIR .cstars-alloy{color:var(--alloy);}\n\n\/* \u2500\u2500 MACHINING NOTES \u2500\u2500 *\/\n.CIR .cmc-cols{display:grid;grid-template-columns:1fr 1fr;gap:20px;}\n@media(max-width:700px){.CIR .cmc-cols{grid-template-columns:1fr;}}\n.CIR .cmc-box{padding:24px;background:#fff;border:1.5px solid var(--border);border-radius:var(--r3);}\n.CIR .cmc-head{font-family:var(--ff-h);font-size:16px;font-weight:700;color:var(--text-1);margin-bottom:14px;display:flex;align-items:center;gap:10px;}\n.CIR .cmc-ico{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:13px;flex-shrink:0;}\n.CIR .cmc-ico-red{background:rgba(239,68,68,0.1);}\n.CIR .cmc-ico-teal{background:var(--teal-dim);}\n.CIR .cmc-row{display:flex;gap:8px;align-items:flex-start;font-size:13px;color:var(--text-2);margin-bottom:10px;line-height:1.6;}\n.CIR .cmc-row:last-child{margin-bottom:0;}\n.CIR .cmc-dot-r{color:#DC2626;font-weight:700;flex-shrink:0;}\n.CIR .cmc-dot-t{color:var(--teal);font-weight:700;flex-shrink:0;}\n.CIR .cmc-row strong{color:var(--text-1);font-weight:600;display:block;margin-bottom:2px;}\n\n\/* \u2500\u2500 CAPABILITIES \u2500\u2500 *\/\n.CIR .ccap-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}\n@media(max-width:900px){.CIR .ccap-grid{grid-template-columns:1fr 1fr;}}\n@media(max-width:500px){.CIR .ccap-grid{grid-template-columns:1fr;}}\n.CIR .ccap-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;transition:all 0.22s;}\n.CIR .ccap-card:hover{border-color:var(--ci);transform:translateY(-3px);box-shadow:0 10px 28px rgba(68,64,60,0.1);}\n.CIR .ccc-img{aspect-ratio:16\/9;overflow:hidden;}\n.CIR .ccc-img img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}\n.CIR .ccap-card:hover .ccc-img img{transform:scale(1.05);}\n.CIR .ccc-body{padding:18px;}\n.CIR .ccc-num{font-family:var(--ff-m);font-size:10px;color:var(--text-3);letter-spacing:2px;margin-bottom:8px;}\n.CIR .ccc-title{font-family:var(--ff-h);font-size:15px;font-weight:700;color:var(--text-1);margin-bottom:6px;}\n.CIR .ccc-desc{font-size:12px;color:var(--text-2);line-height:1.65;margin-bottom:10px;}\n.CIR .ccc-tags{display:flex;flex-wrap:wrap;gap:4px;}\n.CIR .ccct{padding:2px 8px;border-radius:100px;background:var(--bg-light);border:1px solid var(--border);font-family:var(--ff-m);font-size:10px;color:var(--text-3);}\n\n\/* \u2500\u2500 TYPICAL PARTS \u2500\u2500 *\/\n.CIR .cparts-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;}\n@media(max-width:800px){.CIR .cparts-grid{grid-template-columns:1fr 1fr;}}\n@media(max-width:500px){.CIR .cparts-grid{grid-template-columns:1fr;}}\n.CIR .cpart-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;transition:all 0.22s;}\n.CIR .cpart-card:hover{border-color:var(--ci);transform:translateY(-3px);box-shadow:0 10px 28px rgba(68,64,60,0.1);}\n.CIR .cpc-img{aspect-ratio:4\/3;overflow:hidden;position:relative;}\n.CIR .cpc-img img{width:100%;height:100%;object-fit:cover;transition:transform 0.45s;}\n.CIR .cpart-card:hover .cpc-img img{transform:scale(1.07);}\n.CIR .cpc-badge{position:absolute;top:10px;left:10px;padding:3px 10px;border-radius:100px;background:rgba(255,255,255,0.92);backdrop-filter:blur(4px);font-family:var(--ff-m);font-size:10px;font-weight:700;}\n.CIR .cpc-body{padding:16px;}\n.CIR .cpc-title{font-family:var(--ff-h);font-size:14px;font-weight:700;color:var(--text-1);margin-bottom:8px;}\n.CIR .cpc-row{display:flex;gap:8px;margin-bottom:4px;}\n.CIR .cpc-k{font-family:var(--ff-m);font-size:10px;min-width:52px;color:var(--text-3);}\n.CIR .cpc-v{font-size:12px;color:var(--text-2);}\n\n\/* \u2500\u2500 CASE STUDIES \u2500\u2500 *\/\n.CIR .ccase-list{display:flex;flex-direction:column;gap:28px;}\n.CIR .ccase-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--r4);overflow:hidden;transition:all 0.25s;}\n.CIR .ccase-gray:hover{border-color:var(--gray);box-shadow:0 12px 40px rgba(107,114,128,0.1);}\n.CIR .ccase-duct:hover{border-color:var(--duct);box-shadow:0 12px 40px rgba(180,83,9,0.1);}\n.CIR .ccase-alloy:hover{border-color:var(--alloy);box-shadow:0 12px 40px rgba(124,58,237,0.1);}\n.CIR .ccase-inner{display:grid;grid-template-columns:380px 1fr;}\n@media(max-width:900px){.CIR .ccase-inner{grid-template-columns:1fr;}}\n.CIR .ccase-inner.crev{direction:rtl;}\n.CIR .ccase-inner.crev>*{direction:ltr;}\n.CIR .ccase-imgs{display:flex;flex-direction:column;}\n.CIR .cci-main{flex:1;overflow:hidden;min-height:240px;}\n.CIR .cci-main img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}\n.CIR .ccase-card:hover .cci-main img{transform:scale(1.04);}\n.CIR .cci-row{display:grid;grid-template-columns:1fr 1fr;border-top:3px solid #fff;}\n.CIR .cci-sm{overflow:hidden;aspect-ratio:4\/3;}\n.CIR .cci-sm img{width:100%;height:100%;object-fit:cover;}\n.CIR .ccase-body{padding:28px;display:flex;flex-direction:column;justify-content:center;}\n.CIR .ccase-num{font-family:var(--ff-m);font-size:10px;color:var(--text-3);letter-spacing:2px;text-transform:uppercase;margin-bottom:10px;}\n.CIR .ccase-title{font-family:var(--ff-h);font-size:19px;font-weight:700;color:var(--text-1);margin-bottom:12px;line-height:1.2;}\n.CIR .ccase-tags{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:14px;}\n.CIR .ccase-row{display:grid;grid-template-columns:72px 1fr;gap:8px;margin-bottom:8px;align-items:start;}\n.CIR .ccr-k{font-family:var(--ff-m);font-size:10px;color:var(--text-3);letter-spacing:1px;text-transform:uppercase;padding-top:1px;}\n.CIR .ccr-v{font-size:13px;color:var(--text-2);line-height:1.6;}\n.CIR .ccr-v strong{color:var(--text-1);font-weight:600;}\n.CIR .ccase-outcome{padding:12px 14px;border-radius:var(--r2);font-size:13px;color:var(--text-2);line-height:1.65;margin:12px 0 16px;}\n.CIR .cco-gray{background:var(--gray-dim);border:1px solid var(--gray-border);}\n.CIR .cco-gray strong{color:var(--gray);}\n.CIR .cco-duct{background:var(--duct-dim);border:1px solid var(--duct-border);}\n.CIR .cco-duct strong{color:var(--duct);}\n.CIR .cco-alloy{background:var(--alloy-dim);border:1px solid var(--alloy-border);}\n.CIR .cco-alloy strong{color:var(--alloy);}\n\n\/* \u2500\u2500 PROCESS FLOW \u2500\u2500 *\/\n.CIR .cflow-strip{display:grid;grid-template-columns:repeat(5,1fr);border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;background:#fff;box-shadow:0 2px 12px rgba(31,41,55,0.05);}\n@media(max-width:768px){.CIR .cflow-strip{grid-template-columns:1fr 1fr;}}\n.CIR .cflow-step{border-right:1px solid var(--border);transition:background 0.18s;}\n.CIR .cflow-step:last-child{border-right:none;}\n.CIR .cflow-step:hover{background:var(--bg-light);}\n.CIR .cfs-img{aspect-ratio:4\/3;overflow:hidden;}\n.CIR .cfs-img img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}\n.CIR .cflow-step:hover .cfs-img img{transform:scale(1.07);}\n.CIR .cfs-body{padding:16px;}\n.CIR .cfs-num{font-family:var(--ff-m);font-size:10px;color:var(--ci);letter-spacing:2px;font-weight:700;margin-bottom:7px;}\n.CIR .cfs-title{font-family:var(--ff-h);font-size:13px;font-weight:700;color:var(--text-1);margin-bottom:5px;}\n.CIR .cfs-desc{font-size:11px;color:var(--text-2);line-height:1.6;}\n\n\/* \u2500\u2500 SURFACE TREATMENTS \u2500\u2500 *\/\n.CIR .csf-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}\n@media(max-width:900px){.CIR .csf-grid{grid-template-columns:1fr 1fr;}}\n.CIR .csf-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;transition:all 0.22s;}\n.CIR .csf-card:hover{border-color:var(--teal);transform:translateY(-2px);box-shadow:0 8px 24px rgba(15,118,110,0.1);}\n.CIR .csf-img{aspect-ratio:4\/3;overflow:hidden;}\n.CIR .csf-img img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}\n.CIR .csf-card:hover .csf-img img{transform:scale(1.05);}\n.CIR .csf-body{padding:16px;}\n.CIR .csf-name{font-family:var(--ff-h);font-size:14px;font-weight:700;color:var(--text-1);margin-bottom:6px;}\n.CIR .csf-desc{font-size:12px;color:var(--text-2);line-height:1.65;margin-bottom:10px;}\n.CIR .csf-tags{display:flex;flex-wrap:wrap;gap:4px;}\n.CIR .csft{padding:2px 8px;border-radius:100px;background:var(--teal-dim);border:1px solid var(--teal-border);font-family:var(--ff-m);font-size:10px;color:var(--teal);}\n\n\/* \u2500\u2500 METRICS \u2500\u2500 *\/\n.CIR .cmetrics{display:grid;grid-template-columns:repeat(4,1fr);background:var(--ci-mid);}\n@media(max-width:640px){.CIR .cmetrics{grid-template-columns:1fr 1fr;}}\n.CIR .cmetric{padding:36px 24px;text-align:center;border-right:1px solid rgba(255,255,255,0.15);}\n.CIR .cmetric:last-child{border-right:none;}\n.CIR .cmetric-val{font-family:var(--ff-h);font-size:36px;font-weight:900;color:#fff;line-height:1;}\n.CIR .cmetric-unit{font-size:15px;}\n.CIR .cmetric-lbl{font-family:var(--ff-m);font-size:10px;letter-spacing:2px;text-transform:uppercase;color:rgba(255,255,255,0.6);margin-top:8px;}\n\n\/* \u2500\u2500 WHY US \u2500\u2500 *\/\n.CIR .cwhy-layout{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;}\n@media(max-width:800px){.CIR .cwhy-layout{grid-template-columns:1fr;}}\n.CIR .cwhy-img{border-radius:var(--r3);overflow:hidden;aspect-ratio:4\/3;border:1px solid var(--border);box-shadow:0 4px 24px rgba(31,41,55,0.08);}\n.CIR .cwhy-img img{width:100%;height:100%;object-fit:cover;}\n.CIR .cwhy-points{display:flex;flex-direction:column;gap:14px;}\n.CIR .cwp-item{display:flex;gap:13px;align-items:flex-start;padding:16px;background:#fff;border:1.5px solid var(--border);border-radius:var(--r2);transition:all 0.2s;}\n.CIR .cwp-item:hover{border-color:var(--ci);}\n.CIR .cwp-ico{width:38px;height:38px;border-radius:10px;background:var(--ci-dim);border:1px solid var(--ci-border);display:flex;align-items:center;justify-content:center;font-family:var(--ff-m);font-size:11px;font-weight:700;color:var(--ci);flex-shrink:0;}\n.CIR .cwp-title{font-family:var(--ff-h);font-size:14px;font-weight:700;color:var(--text-1);margin-bottom:4px;}\n.CIR .cwp-desc{font-size:12px;color:var(--text-2);line-height:1.65;}\n\n\/* \u2500\u2500 INDUSTRIES \u2500\u2500 *\/\n.CIR .cind-row{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;}\n@media(max-width:900px){.CIR .cind-row{grid-template-columns:repeat(3,1fr);}}\n@media(max-width:480px){.CIR .cind-row{grid-template-columns:1fr 1fr;}}\n.CIR .cind-mini{padding:18px 12px;text-align:center;background:#fff;border:1.5px solid var(--border);border-radius:var(--r2);transition:all 0.2s;}\n.CIR .cind-mini:hover{border-color:var(--ci);box-shadow:0 6px 18px rgba(68,64,60,0.1);}\n.CIR .cim-icon{font-size:22px;margin-bottom:8px;}\n.CIR .cim-name{font-family:var(--ff-h);font-size:13px;font-weight:700;color:var(--text-1);margin-bottom:3px;}\n.CIR .cim-grade{font-family:var(--ff-m);font-size:10px;color:var(--text-3);}\n\n\/* \u2500\u2500 FAQ \u2500\u2500 *\/\n.CIR .cfaq-layout{display:grid;grid-template-columns:1fr 2fr;gap:56px;align-items:start;}\n@media(max-width:800px){.CIR .cfaq-layout{grid-template-columns:1fr;}}\n.CIR .cfaq-list{border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;}\n.CIR .cfaq-item{border-bottom:1px solid var(--border);}\n.CIR .cfaq-item:last-child{border-bottom:none;}\n.CIR .cfaq-q{width:100%;padding:17px 20px;background:none;border:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:14px;font-family:var(--ff-h);font-size:14px;font-weight:700;color:var(--text-1);text-align:left;transition:background 0.15s;}\n.CIR .cfaq-q:hover{background:var(--bg-light);}\n.CIR .cfaq-q.copen{color:var(--ci-mid);background:var(--ci-dim);}\n.CIR .cfaq-icon{width:24px;height:24px;border-radius:50%;background:var(--bg-light);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:14px;flex-shrink:0;transition:all 0.2s;color:var(--text-2);}\n.CIR .cfaq-q.copen .cfaq-icon{background:var(--ci-mid);border-color:var(--ci-mid);color:#fff;transform:rotate(45deg);}\n.CIR .cfaq-a{display:none;padding:0 20px 16px;font-size:13px;color:var(--text-2);line-height:1.75;}\n.CIR .cfaq-a.copen{display:block;}\n\n\/* \u2500\u2500 CTA \u2500\u2500 *\/\n.CIR .ccta{position:relative;padding:96px 0;overflow:hidden;}\n.CIR .ccta-bg{position:absolute;inset:0;}\n.CIR .ccta-bg img{width:100%;height:100%;object-fit:cover;filter:brightness(0.18);}\n.CIR .ccta-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(41,37,36,0.92),rgba(68,64,60,0.7));}\n.CIR .ccta-dots{position:absolute;inset:0;background-image:radial-gradient(circle,rgba(255,255,255,0.08) 1px,transparent 1px);background-size:24px 24px;}\n.CIR .ccta-inner{position:relative;z-index:2;text-align:center;}\n.CIR .ccta-lbl{display:inline-flex;align-items:center;gap:8px;font-family:var(--ff-m);font-size:11px;font-weight:500;letter-spacing:3px;text-transform:uppercase;color:rgba(255,255,255,0.6);margin-bottom:14px;justify-content:center;}\n.CIR .ccta-h2{font-family:var(--ff-h);font-size:clamp(26px,3.5vw,50px);font-weight:700;color:#fff;margin-bottom:14px;line-height:1.1;}\n.CIR .ccta-sub{font-size:16px;color:rgba(255,255,255,0.75);margin-bottom:34px;max-width:540px;margin-left:auto;margin-right:auto;line-height:1.75;}\n.CIR .ccta-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}\n<\/style>\n\n<div class=\"CIR\">\n<!-- BREADCRUMB -->\n<div class=\"cbreadcrumb\">\n  <div class=\"cwrap\">\n    <div class=\"cbc-inner\">\n      <a href=\"\/\">Home<\/a><span class=\"cbc-sep\">\/<\/span>\n      <a href=\"\/material\/\">Materials<\/a><span class=\"cbc-sep\">\/<\/span>\n      <a href=\"\/material\/iron\/\">Cast Iron<\/a><span class=\"cbc-sep\">\/<\/span>\n      <span class=\"cbc-current\">Cast Iron \u2014 Gray \u00b7 Ductile \u00b7 Alloy Cast Iron<\/span>\n    <\/div>\n  <\/div>\n<\/div>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     1. HERO\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"chero\">\n  <div class=\"chero-dot\"><\/div>\n  <div class=\"cwrap\">\n    <div class=\"chero-inner\">\n      <div>\n        <div class=\"clabel\">Cast Iron CNC Machining<\/div>\n        <h1 class=\"chero-h1\">Cast Iron<br><span style=\"color:var(--ci);\">CNC Machining<\/span><\/h1>\n        <div class=\"chero-kicker\">\n          <span class=\"chk-pill\"><span class=\"chk-dot\" style=\"background:var(--gray);\"><\/span>Gray Cast Iron<\/span>\n          <span class=\"chk-pill\"><span class=\"chk-dot\" style=\"background:var(--duct);\"><\/span>Ductile (Nodular) Iron<\/span>\n          <span class=\"chk-pill\"><span class=\"chk-dot\" style=\"background:var(--alloy);\"><\/span>Alloy Cast Iron<\/span>\n          <span class=\"chk-pill\"><span class=\"chk-dot\" style=\"background:var(--ci);\"><\/span>Engine Blocks \u00b7 Housings \u00b7 Bases<\/span>\n          <span class=\"chk-pill\"><span class=\"chk-dot\" style=\"background:var(--ci);\"><\/span>Wear Parts \u00b7 Valves \u00b7 Brake Components<\/span>\n        <\/div>\n        <p class=\"chero-sub\">Precision CNC machining of gray cast iron, ductile (nodular) iron, and alloy cast iron for engine components, machine tool bases, pump housings, valve bodies, brake parts, and heavy-duty structural components where rigidity, vibration damping, and wear resistance are essential.<\/p>\n        <div class=\"chero-btns\">\n          <a href=\"#ciquote\" class=\"cbtn cbtn-primary\">Get a Quote \u2192<\/a>\n          <a href=\"#ciquote\" class=\"cbtn cbtn-outline\">Send Your Drawing<\/a>\n        <\/div>\n      <\/div>\n\n      <div class=\"chero-imgs\">\n        <div class=\"chi-main\">\n          <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Alloy-Cast-Iron.jpeg\" alt=\"Cast Iron CNC Machined Engine Block Housing Brake Drum\">\n        <\/div>\n        <div class=\"chi-badge\">\n          <div class=\"chib-l\">Compressive Strength<\/div>\n          <div class=\"chib-v\">3\u20135\u00d7 Tensile<\/div>\n        <\/div>\n        <div class=\"chi-sm1\">\n          <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Gray-Cast-Iron.jpeg\" alt=\"CNC Boring Gray Cast Iron Pump Housing\">\n        <\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"chero-bar\">\n      <div class=\"chbar-item\"><div class=\"chbar-v\">3 Grades<\/div><div class=\"chbar-l\">Gray \/ Ductile \/ Alloy<\/div><\/div>\n      <div class=\"chbar-item\"><div class=\"chbar-v\">900 MPa<\/div><div class=\"chbar-l\">Ductile Iron Tensile<\/div><\/div>\n      <div class=\"chbar-item\"><div class=\"chbar-v\">HRC 55+<\/div><div class=\"chbar-l\">Alloy Iron Hardness<\/div><\/div>\n      <div class=\"chbar-item\"><div class=\"chbar-v\">24hr<\/div><div class=\"chbar-l\">Quote Turnaround<\/div><\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- TICKER -->\n<div class=\"cticker\">\n  <div class=\"ctick-track\">\n    <span class=\"ctick-item\">Gray Cast Iron EN-GJL <span class=\"ct-gray\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Ductile \/ Nodular Iron EN-GJS <span class=\"ct-duct\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Alloy Cast Iron \u00b7 Ni-Hard \u00b7 Hi-Chrome <span class=\"ct-alloy\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Engine Blocks &amp; Cylinder Heads <span class=\"ct-gray\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Hydraulic Valve Bodies <span class=\"ct-duct\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Machine Tool Bases &amp; Beds <span class=\"ct-gray\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Wear-Resistant Impellers &amp; Liners <span class=\"ct-alloy\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Brake Drums &amp; Discs <span class=\"ct-gray\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Crankshafts &amp; Differential Housings <span class=\"ct-duct\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Gray Cast Iron EN-GJL <span class=\"ct-gray\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Ductile \/ Nodular Iron EN-GJS <span class=\"ct-duct\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Alloy Cast Iron \u00b7 Ni-Hard \u00b7 Hi-Chrome <span class=\"ct-alloy\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Engine Blocks &amp; Cylinder Heads <span class=\"ct-gray\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Hydraulic Valve Bodies <span class=\"ct-duct\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Machine Tool Bases &amp; Beds <span class=\"ct-gray\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Wear-Resistant Impellers &amp; Liners <span class=\"ct-alloy\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Brake Drums &amp; Discs <span class=\"ct-gray\">\u2726<\/span><\/span>\n    <span class=\"ctick-item\">Crankshafts &amp; Differential Housings <span class=\"ct-duct\">\u2726<\/span><\/span>\n  <\/div>\n<\/div>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     2. GRADE CARDS\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"csec csec-white\">\n  <div class=\"cwrap\">\n    <div class=\"csec-head\">\n      <div>\n        <div class=\"clabel\">Material Grades<\/div>\n        <h2 class=\"ch2\">Three Cast Iron Grades, <span style=\"color:var(--ci);\">Three Different Strengths<\/span><\/h2>\n      <\/div>\n    <\/div>\n\n    <div class=\"cgrade-grid\">\n\n      <!-- Gray Cast Iron -->\n      <div class=\"cgc cgc-gray\">\n        <div class=\"cgc-body\">\n          <div class=\"cgc-grade cgray\">GJL \/ HT<\/div>\n          <div class=\"cgc-std\">ASTM A48 \u00b7 ISO EN-GJL \u00b7 GB HT Series<\/div>\n          <div class=\"cgc-name\">Flake Graphite Cast Iron \u2014 The Industry Workhorse<\/div>\n          <div class=\"cgc-desc\">The most widely used and most cost-effective cast iron. Graphite precipitates as interconnected flakes within the iron matrix, giving gray iron its defining characteristics: outstanding vibration damping, self-lubrication (graphite acts as a dry lubricant), excellent machinability, and good compressive strength. The gray fracture surface is the origin of its name. Used in virtually every industry that requires large, complex castings machined to precision.<\/div>\n          <div class=\"cgc-stat-grid\">\n            <div class=\"cgc-stat cgs-gray\"><div class=\"cgc-stat-val cgray\">150\u2013350 MPa<\/div><div class=\"cgc-stat-lbl\">Tensile Strength<\/div><\/div>\n            <div class=\"cgc-stat cgs-gray\"><div class=\"cgc-stat-val cgray\">600\u20131400 MPa<\/div><div class=\"cgc-stat-lbl\">Compressive Strength<\/div><\/div>\n            <div class=\"cgc-stat cgs-gray\"><div class=\"cgc-stat-val cgray\">HB 170\u2013260<\/div><div class=\"cgc-stat-lbl\">Hardness<\/div><\/div>\n            <div class=\"cgc-stat cgs-gray\"><div class=\"cgc-stat-val cgray\">Excellent<\/div><div class=\"cgc-stat-lbl\">Machinability<\/div><\/div>\n          <\/div>\n          <div class=\"cgc-comp-title\">Common Grade Standards<\/div>\n          <div class=\"cgc-grades-list\">\n            <span class=\"cgc-grade-tag\" style=\"background:var(--gray-dim);color:var(--gray);border:1px solid var(--gray-border);\">ASTM A48 Class 20\u201340<\/span>\n            <span class=\"cgc-grade-tag\" style=\"background:var(--gray-dim);color:var(--gray);border:1px solid var(--gray-border);\">EN-GJL-150 to GJL-300<\/span>\n            <span class=\"cgc-grade-tag\" style=\"background:var(--gray-dim);color:var(--gray);border:1px solid var(--gray-border);\">GB HT150 \/ HT200 \/ HT250 \/ HT300<\/span>\n          <\/div>\n          <div class=\"cgc-comp-title\">Chemical Composition (Typical)<\/div>\n          <table class=\"cgc-comp-table\">\n            <tr><td>Carbon (C)<\/td><td class=\"cgray\">3.0\u20133.5%<\/td><\/tr>\n            <tr><td>Silicon (Si)<\/td><td class=\"cgray\">1.8\u20132.8%<\/td><\/tr>\n            <tr><td>Manganese (Mn)<\/td><td class=\"cgray\">0.5\u20130.9%<\/td><\/tr>\n            <tr><td>Phosphorus (P)<\/td><td class=\"cgray\">\u22640.25%<\/td><\/tr>\n            <tr><td>Sulfur (S)<\/td><td class=\"cgray\">\u22640.12%<\/td><\/tr>\n          <\/table>\n          <div class=\"cgc-props\">\n            <div class=\"cgc-prop\"><span class=\"cgc-dot\" style=\"background:var(--gray);\"><\/span>Exceptional vibration damping \u2014 ideal for machine tool bases<\/div>\n            <div class=\"cgc-prop\"><span class=\"cgc-dot\" style=\"background:var(--gray);\"><\/span>Self-lubricating graphite flakes \u2014 good for sliding wear surfaces<\/div>\n            <div class=\"cgc-prop\"><span class=\"cgc-dot\" style=\"background:var(--gray);\"><\/span>Low tensile strength \u2014 brittle; not for impact or tensile loading<\/div>\n            <div class=\"cgc-prop\"><span class=\"cgc-dot\" style=\"background:var(--gray);\"><\/span>Hard as-cast skin must be cleared on first machining pass<\/div>\n          <\/div>\n          <div class=\"cgc-uses\"><span class=\"cgc-use\">Engine Blocks<\/span><span class=\"cgc-use\">Cylinder Heads<\/span><span class=\"cgc-use\">Brake Drums<\/span><span class=\"cgc-use\">Machine Beds<\/span><span class=\"cgc-use\">Pump Housings<\/span><\/div>\n          <span class=\"cgc-link cgl-gray\">View Gray Iron Details<\/span>\n        <\/div>\n      <\/div>\n\n      <!-- Ductile Cast Iron -->\n      <div class=\"cgc cgc-duct\">\n      \n        <div class=\"cgc-body\">\n          <div class=\"cgc-grade cduct\">GJS \/ QT<\/div>\n          <div class=\"cgc-std\">ASTM A536 \u00b7 ISO EN-GJS \u00b7 GB QT Series<\/div>\n          <div class=\"cgc-name\">Spheroidal Graphite Iron \u2014 Steel-Like Strength, Iron Machinability<\/div>\n          <div class=\"cgc-desc\">Produced by adding magnesium to the melt before casting, which transforms graphite from flakes into spherical nodules. This one change transforms the mechanical properties dramatically: tensile strength jumps to 400\u2013900 MPa, elongation reaches up to 18%, and impact resistance approaches that of steel \u2014 while machinability remains close to gray iron. Ductile iron bridges the gap between gray cast iron and cast steel, making it the preferred choice for highly loaded structural castings.<\/div>\n          <div class=\"cgc-stat-grid\">\n            <div class=\"cgc-stat cgs-duct\"><div class=\"cgc-stat-val cduct\">400\u2013900 MPa<\/div><div class=\"cgc-stat-lbl\">Tensile Strength<\/div><\/div>\n            <div class=\"cgc-stat cgs-duct\"><div class=\"cgc-stat-val cduct\">Up to 18%<\/div><div class=\"cgc-stat-lbl\">Elongation<\/div><\/div>\n            <div class=\"cgc-stat cgs-duct\"><div class=\"cgc-stat-val cduct\">HB 140\u2013300<\/div><div class=\"cgc-stat-lbl\">Hardness<\/div><\/div>\n            <div class=\"cgc-stat cgs-duct\"><div class=\"cgc-stat-val cduct\">Good<\/div><div class=\"cgc-stat-lbl\">Machinability<\/div><\/div>\n          <\/div>\n          <div class=\"cgc-comp-title\">Common Grade Standards<\/div>\n          <div class=\"cgc-grades-list\">\n            <span class=\"cgc-grade-tag\" style=\"background:var(--duct-dim);color:var(--duct);border:1px solid var(--duct-border);\">ASTM A536 Gr. 65-45-12<\/span>\n            <span class=\"cgc-grade-tag\" style=\"background:var(--duct-dim);color:var(--duct);border:1px solid var(--duct-border);\">ASTM A536 Gr. 80-55-06<\/span>\n            <span class=\"cgc-grade-tag\" style=\"background:var(--duct-dim);color:var(--duct);border:1px solid var(--duct-border);\">EN-GJS-400-18 \/ 500-7 \/ 700-2<\/span>\n            <span class=\"cgc-grade-tag\" style=\"background:var(--duct-dim);color:var(--duct);border:1px solid var(--duct-border);\">GB QT400 \/ QT500 \/ QT700<\/span>\n          <\/div>\n          <div class=\"cgc-comp-title\">Chemical Composition (Typical)<\/div>\n          <table class=\"cgc-comp-table\">\n            <tr><td>Carbon (C)<\/td><td class=\"cduct\">3.5\u20133.9%<\/td><\/tr>\n            <tr><td>Silicon (Si)<\/td><td class=\"cduct\">2.0\u20132.8%<\/td><\/tr>\n            <tr><td>Magnesium (Mg)<\/td><td class=\"cduct\">0.03\u20130.06%<\/td><\/tr>\n            <tr><td>Manganese (Mn)<\/td><td class=\"cduct\">0.1\u20130.5%<\/td><\/tr>\n            <tr><td>Sulfur (S)<\/td><td class=\"cduct\">\u22640.02%<\/td><\/tr>\n          <\/table>\n          <div class=\"cgc-props\">\n            <div class=\"cgc-prop\"><span class=\"cgc-dot\" style=\"background:var(--duct);\"><\/span>High tensile strength with ductility \u2014 unlike gray iron it resists impact<\/div>\n            <div class=\"cgc-prop\"><span class=\"cgc-dot\" style=\"background:var(--duct);\"><\/span>Good fatigue resistance \u2014 suitable for cyclic loading applications<\/div>\n            <div class=\"cgc-prop\"><span class=\"cgc-dot\" style=\"background:var(--duct);\"><\/span>Can be heat-treated (annealed, normalized, Q&amp;T) to adjust properties<\/div>\n            <div class=\"cgc-prop\"><span class=\"cgc-dot\" style=\"background:var(--duct);\"><\/span>Better machinability than cast steel of equivalent strength<\/div>\n          <\/div>\n          <div class=\"cgc-uses\"><span class=\"cgc-use\">Crankshafts<\/span><span class=\"cgc-use\">Gears<\/span><span class=\"cgc-use\">Hydraulic Valves<\/span><span class=\"cgc-use\">Diff. Housings<\/span><span class=\"cgc-use\">Suspension Parts<\/span><\/div>\n          <span class=\"cgc-link cgl-duct\">View Ductile Iron Details<\/span>\n        <\/div>\n      <\/div>\n\n      <!-- Alloy Cast Iron -->\n      <div class=\"cgc cgc-alloy\">\n      \n        <div class=\"cgc-body\">\n          <div class=\"cgc-grade calloy\">ALLOY CI<\/div>\n          <div class=\"cgc-std\">Hi-Chrome \u00b7 Ni-Hard \u00b7 Ni-Resist \u00b7 ASTM A532<\/div>\n          <div class=\"cgc-name\">Engineered for Extreme Wear, Heat &amp; Corrosion Resistance<\/div>\n          <div class=\"cgc-desc\">Alloy cast irons incorporate deliberate additions of chromium, nickel, molybdenum, or copper to produce properties impossible in standard gray or ductile iron. High-chromium white iron (15\u201330% Cr) achieves HRC 55\u201365 for extreme abrasion resistance in mining and mineral processing. Ni-Hard (4% Ni, 2% Cr) provides excellent wear resistance with improved toughness. Austenitic Ni-Resist iron offers corrosion resistance and dimensional stability at elevated temperatures (up to 800\u00b0C). These grades are specified where standard cast irons fail due to wear, heat, or chemical attack.<\/div>\n          <div class=\"cgc-stat-grid\">\n            <div class=\"cgc-stat cgs-alloy\"><div class=\"cgc-stat-val calloy\">HRC 55\u201365<\/div><div class=\"cgc-stat-lbl\">Hardness (Hi-Cr)<\/div><\/div>\n            <div class=\"cgc-stat cgs-alloy\"><div class=\"cgc-stat-val calloy\">to 800\u00b0C<\/div><div class=\"cgc-stat-lbl\">Ni-Resist Temp<\/div><\/div>\n            <div class=\"cgc-stat cgs-alloy\"><div class=\"cgc-stat-val calloy\">Extreme<\/div><div class=\"cgc-stat-lbl\">Wear Resistance<\/div><\/div>\n            <div class=\"cgc-stat cgs-alloy\"><div class=\"cgc-stat-val calloy\">Low<\/div><div class=\"cgc-stat-lbl\">Machinability<\/div><\/div>\n          <\/div>\n          <div class=\"cgc-comp-title\">Common Types<\/div>\n          <div class=\"cgc-grades-list\">\n            <span class=\"cgc-grade-tag\" style=\"background:var(--alloy-dim);color:var(--alloy);border:1px solid var(--alloy-border);\">Hi-Chrome White Iron (15\u201328% Cr)<\/span>\n            <span class=\"cgc-grade-tag\" style=\"background:var(--alloy-dim);color:var(--alloy);border:1px solid var(--alloy-border);\">Ni-Hard (ASTM A532 Class I)<\/span>\n            <span class=\"cgc-grade-tag\" style=\"background:var(--alloy-dim);color:var(--alloy);border:1px solid var(--alloy-border);\">Ni-Resist Austenitic (ASTM A436)<\/span>\n          <\/div>\n          <div class=\"cgc-comp-title\">Key Alloying (Hi-Chrome, Typical)<\/div>\n          <table class=\"cgc-comp-table\">\n            <tr><td>Carbon (C)<\/td><td class=\"calloy\">2.4\u20133.5%<\/td><\/tr>\n            <tr><td>Chromium (Cr)<\/td><td class=\"calloy\">15.0\u201328.0%<\/td><\/tr>\n            <tr><td>Molybdenum (Mo)<\/td><td class=\"calloy\">0.5\u20133.5%<\/td><\/tr>\n            <tr><td>Nickel (Ni) max<\/td><td class=\"calloy\">up to 2.5%<\/td><\/tr>\n            <tr><td>Silicon (Si)<\/td><td class=\"calloy\">0.5\u20131.2%<\/td><\/tr>\n          <\/table>\n          <div class=\"cgc-props\">\n            <div class=\"cgc-prop\"><span class=\"cgc-dot\" style=\"background:var(--alloy);\"><\/span>Extreme abrasion resistance \u2014 10\u2013100\u00d7 life vs gray iron in wear service<\/div>\n            <div class=\"cgc-prop\"><span class=\"cgc-dot\" style=\"background:var(--alloy);\"><\/span>Requires carbide or CBN tooling \u2014 very hard, difficult to machine<\/div>\n            <div class=\"cgc-prop\"><span class=\"cgc-dot\" style=\"background:var(--alloy);\"><\/span>Hardness can vary significantly across a single casting<\/div>\n            <div class=\"cgc-prop\"><span class=\"cgc-dot\" style=\"background:var(--alloy);\"><\/span>Ni-Resist: corrosion and heat resistance, not primarily wear-focused<\/div>\n          <\/div>\n          <div class=\"cgc-uses\"><span class=\"cgc-use\">Wear Liners<\/span><span class=\"cgc-use\">Pump Impellers<\/span><span class=\"cgc-use\">Slurry Parts<\/span><span class=\"cgc-use\">Crusher Rings<\/span><span class=\"cgc-use\">High-Temp Parts<\/span><\/div>\n          <span class=\"cgc-link cgl-alloy\">View Alloy Iron Details<\/span>\n        <\/div>\n      <\/div>\n\n    <\/div>\n\n    <!-- Grade selection -->\n    <div style=\"margin-top:28px;\">\n      <div class=\"csec-head\" style=\"margin-bottom:20px;\">\n        <div>\n          <div class=\"clabel\">Grade Selection Guide<\/div>\n          <h2 class=\"ch2\">Choosing the Right <span style=\"color:var(--ci);\">Cast Iron Grade<\/span><\/h2>\n        <\/div>\n      <\/div>\n      <div class=\"cwhen-grid\">\n        <div class=\"cwhen-card cwc-gray\">\n          <div class=\"cwc-head\"><div class=\"cwc-ico\" style=\"background:var(--gray-dim);\">\u2b1b<\/div><span class=\"cgray\">Choose Gray Cast Iron when\u2026<\/span><\/div>\n          <div class=\"cwc-list\">\n            <div class=\"cwc-item\"><span style=\"color:var(--gray);font-weight:700;\">\u2713<\/span>Machine tool bases, beds, and columns requiring vibration damping<\/div>\n            <div class=\"cwc-item\"><span style=\"color:var(--gray);font-weight:700;\">\u2713<\/span>Engine blocks, cylinder heads, and exhaust manifolds<\/div>\n            <div class=\"cwc-item\"><span style=\"color:var(--gray);font-weight:700;\">\u2713<\/span>Brake drums, brake discs, and friction components<\/div>\n            <div class=\"cwc-item\"><span style=\"color:var(--gray);font-weight:700;\">\u2713<\/span>Pump and compressor housings \u2014 cost-effective in large volumes<\/div>\n            <div class=\"cwc-item\"><span style=\"color:var(--gray);font-weight:700;\">\u2713<\/span>Application is primarily compressive \u2014 low tensile loading<\/div>\n          <\/div>\n        <\/div>\n        <div class=\"cwhen-card cwc-duct\">\n          <div class=\"cwc-head\"><div class=\"cwc-ico\" style=\"background:var(--duct-dim);\">\u2b24<\/div><span class=\"cduct\">Choose Ductile Iron when\u2026<\/span><\/div>\n          <div class=\"cwc-list\">\n            <div class=\"cwc-item\"><span style=\"color:var(--duct);font-weight:700;\">\u2713<\/span>High tensile or impact load \u2014 gray iron would fracture<\/div>\n            <div class=\"cwc-item\"><span style=\"color:var(--duct);font-weight:700;\">\u2713<\/span>Crankshafts, gears, and automotive structural castings<\/div>\n            <div class=\"cwc-item\"><span style=\"color:var(--duct);font-weight:700;\">\u2713<\/span>Hydraulic valve bodies and pressure-containing components<\/div>\n            <div class=\"cwc-item\"><span style=\"color:var(--duct);font-weight:700;\">\u2713<\/span>Fatigue-loaded parts \u2014 superior fatigue life vs gray iron<\/div>\n            <div class=\"cwc-item\"><span style=\"color:var(--duct);font-weight:700;\">\u2713<\/span>Cast steel equivalent properties at lower cost and better machinability<\/div>\n          <\/div>\n        <\/div>\n        <div class=\"cwhen-card cwc-alloy\">\n          <div class=\"cwc-head\"><div class=\"cwc-ico\" style=\"background:var(--alloy-dim);\">\u25c6<\/div><span class=\"calloy\">Choose Alloy Cast Iron when\u2026<\/span><\/div>\n          <div class=\"cwc-list\">\n            <div class=\"cwc-item\"><span style=\"color:var(--alloy);font-weight:700;\">\u2713<\/span>Extreme abrasion \u2014 mining, mineral processing, slurry pumps<\/div>\n            <div class=\"cwc-item\"><span style=\"color:var(--alloy);font-weight:700;\">\u2713<\/span>Standard gray or ductile iron has unacceptable service life<\/div>\n            <div class=\"cwc-item\"><span style=\"color:var(--alloy);font-weight:700;\">\u2713<\/span>Elevated temperature service above 300\u00b0C (Ni-Resist)<\/div>\n            <div class=\"cwc-item\"><span style=\"color:var(--alloy);font-weight:700;\">\u2713<\/span>Corrosive chemical environments (austenitic Ni-Resist)<\/div>\n            <div class=\"cwc-item\"><span style=\"color:var(--alloy);font-weight:700;\">\u2713<\/span>Crusher wear parts, pump liners, and cyclone components<\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     3. COMPARISON TABLE\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"csec csec-light\">\n  <div class=\"cwrap\">\n    <div class=\"csec-head\">\n      <div>\n        <div class=\"clabel\">Material Comparison<\/div>\n        <h2 class=\"ch2\">Full Property Comparison \u2014 <span class=\"cblue\">Gray \u00b7 Ductile \u00b7 Alloy Cast Iron<\/span><\/h2>\n      <\/div>\n    <\/div>\n    <div class=\"ccmp-wrap\">\n      <table class=\"ccmp-table\">\n        <thead>\n          <tr>\n            <th>Property<\/th>\n            <th>Gray Cast Iron<\/th>\n            <th>Ductile Iron<\/th>\n            <th>Alloy Cast Iron (Hi-Cr)<\/th>\n            <th>1045 Steel (ref)<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td>Graphite Form<\/td>\n            <td>Flake \u2014 interconnected<\/td>\n            <td><span class=\"badge-duct\">Nodular spheres<\/span><\/td>\n            <td>Carbide matrix (white)<\/td>\n            <td>None (steel)<\/td>\n          <\/tr>\n          <tr>\n            <td>Tensile Strength<\/td>\n            <td>150\u2013350 MPa<\/td>\n            <td><span class=\"badge-duct\">400\u2013900 MPa<\/span><\/td>\n            <td>~500\u2013700 MPa (brittle)<\/td>\n            <td>~570\u2013700 MPa<\/td>\n          <\/tr>\n          <tr>\n            <td>Elongation<\/td>\n            <td><span class=\"badge-warn\">&lt;1% \u2014 brittle<\/span><\/td>\n            <td><span class=\"badge-ok\">2\u201318% \u2014 ductile<\/span><\/td>\n            <td>&lt;1% \u2014 very brittle<\/td>\n            <td>16\u201322%<\/td>\n          <\/tr>\n          <tr>\n            <td>Hardness<\/td>\n            <td>HB 170\u2013260<\/td>\n            <td>HB 140\u2013300<\/td>\n            <td><span class=\"badge-alloy\">HRC 55\u201365 (Hi-Cr)<\/span><\/td>\n            <td>HB 170\u2013220<\/td>\n          <\/tr>\n          <tr>\n            <td>Vibration Damping<\/td>\n            <td><span class=\"badge-ok\">Excellent \u2014 best of all<\/span><\/td>\n            <td>Good<\/td>\n            <td>Moderate<\/td>\n            <td>Poor<\/td>\n          <\/tr>\n          <tr>\n            <td>Abrasion Resistance<\/td>\n            <td>Moderate<\/td>\n            <td>Good<\/td>\n            <td><span class=\"badge-ok\">Extreme \u2014 10\u2013100\u00d7 gray<\/span><\/td>\n            <td>Moderate<\/td>\n          <\/tr>\n          <tr>\n            <td>Machinability<\/td>\n            <td><span class=\"cstars-gray\">\u2605\u2605\u2605\u2605\u2605<\/span> Best<\/td>\n            <td><span class=\"cstars-duct\">\u2605\u2605\u2605\u2605<\/span> Good<\/td>\n            <td><span class=\"cstars-alloy\">\u2605<\/span> Very difficult<\/td>\n            <td><span style=\"color:var(--blue);\">\u2605\u2605\u2605\u2605<\/span> Good<\/td>\n          <\/tr>\n          <tr>\n            <td>Weldability<\/td>\n            <td><span class=\"badge-warn\">Possible w\/ preheat<\/span><\/td>\n            <td><span class=\"badge-warn\">Possible w\/ preheat<\/span><\/td>\n            <td><span class=\"badge-warn\">Generally not recommended<\/span><\/td>\n            <td><span class=\"badge-ok\">Good<\/span><\/td>\n          <\/tr>\n          <tr>\n            <td>Heat Treatment<\/td>\n            <td>Stress relieve only<\/td>\n            <td>Full range (anneal, Q&amp;T)<\/td>\n            <td>Stress relieve \/ anneal<\/td>\n            <td>Full range<\/td>\n          <\/tr>\n          <tr>\n            <td>Primary Use<\/td>\n            <td>Engine parts, machine bases, brakes<\/td>\n            <td>Crankshafts, gears, hydraulics<\/td>\n            <td>Wear liners, slurry pumps, crushers<\/td>\n            <td>Shafts, gears, structural<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     4. MACHINING NOTES\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"csec csec-white\">\n  <div class=\"cwrap\">\n    <div class=\"csec-head\">\n      <div>\n        <div class=\"clabel\">Machining Notes<\/div>\n        <h2 class=\"ch2\">Machining Cast Iron \u2014 <span style=\"color:var(--ci);\">What Engineers Need to Know<\/span><\/h2>\n      <\/div>\n    <\/div>\n    <div class=\"cmc-cols\">\n      <div class=\"cmc-box\">\n        <div class=\"cmc-head\"><div class=\"cmc-ico cmc-ico-red\">\u26a0<\/div>Key Challenges with Cast Iron Machining<\/div>\n        <div class=\"cmc-row\"><span class=\"cmc-dot-r\">!<\/span><div><strong>Hard as-cast skin on every casting \u2014 first pass must go below it<\/strong>All cast iron castings have a chilled outer skin containing sand inclusions, oxide scale, and a harder layer caused by rapid solidification at the mold surface. This skin is significantly harder than the material beneath and destroys tooling if the first pass is too shallow to cut through it entirely. First pass depth of cut must always exceed the skin depth (typically 3\u20135 mm) \u2014 do not skim-cut on raw cast iron.<\/div><\/div>\n        <div class=\"cmc-row\"><span class=\"cmc-dot-r\">!<\/span><div><strong>Abrasive graphite accelerates tool flank wear<\/strong>Despite being a dry lubricant, graphite flakes are mechanically abrasive at the microscale. They cause progressive flank wear on carbide inserts \u2014 particularly at the depth-of-cut line where the tool transitions between cut and un-cut surface. Tool wear in cast iron is steady and predictable but requires regular insert changes, especially when switching between the hard skin and the bulk material.<\/div><\/div>\n        <div class=\"cmc-row\"><span class=\"cmc-dot-r\">!<\/span><div><strong>Dry or MQL preferred \u2014 not flood coolant for most grades<\/strong>Gray cast iron is typically machined dry or with minimum quantity lubrication (MQL). Flood coolant can cause thermal shock in the workpiece during interrupted cuts and does not improve surface quality significantly due to the graphite's self-lubricating nature. Alloy cast irons (especially high-chromium white iron) must be machined dry \u2014 thermal cycling from coolant causes surface micro-cracking in carbide-phase materials.<\/div><\/div>\n        <div class=\"cmc-row\"><span class=\"cmc-dot-r\">!<\/span><div><strong>Alloy cast iron hardness variation \u2014 expect tool surprises<\/strong>High-chromium and Ni-Hard alloy irons can have significant hardness variation across a single casting due to differences in cooling rate at different section thicknesses. A zone that cooled faster may be HRC 65 while an adjacent thicker section is HRC 55. This unpredictability demands conservative cutting parameters and frequent tool life checks when machining alloy irons.<\/div><\/div>\n        <div class=\"cmc-row\"><span class=\"cmc-dot-r\">!<\/span><div><strong>Porosity in castings \u2014 watch for voids when approaching thin walls<\/strong>Internal voids and porosity in castings can be exposed when walls are machined thin. Always confirm casting quality standard (e.g. ASTM A128, radiographic or ultrasonic inspection level) before committing to tight wall thickness dimensions on machined castings.<\/div><\/div>\n      <\/div>\n      <div class=\"cmc-box\">\n        <div class=\"cmc-head\"><div class=\"cmc-ico cmc-ico-teal\">\u2713<\/div>How We Handle Cast Iron Machining<\/div>\n        <div class=\"cmc-row\"><span class=\"cmc-dot-t\">\u2713<\/span><div><strong>First-pass depth programmed to clear skin on every casting<\/strong>Our CAM programs set a minimum first-pass depth of cut that accounts for the as-cast surface condition. For rough castings with heavy scale, we preview the casting stock allowance with the customer before programming \u2014 ensuring the first tool pass clears the hard skin completely on all faces.<\/div><\/div>\n        <div class=\"cmc-row\"><span class=\"cmc-dot-t\">\u2713<\/span><div><strong>Grade-specific tooling \u2014 uncoated carbide for gray, coated for ductile, CBN for alloy<\/strong>Gray cast iron: uncoated or lightly coated carbide \u2014 coolant-free, fast, and economical. Ductile iron: PVD-coated carbide (AlTiN) with slightly slower speeds to manage the tougher nodular matrix. Alloy cast iron: CBN (cubic boron nitride) or PCD inserts \u2014 the only practical tooling for high-chromium white irons above HRC 50.<\/div><\/div>\n        <div class=\"cmc-row\"><span class=\"cmc-dot-t\">\u2713<\/span><div><strong>Datum confirmation on castings \u2014 fixturing before first cut<\/strong>Cast iron castings arrive with inherent dimensional variation. We confirm datums and wall stock before fixturing \u2014 verifying that sufficient machining stock exists on all surfaces before committing to the first cut. This prevents discovering insufficient stock mid-operation on expensive castings.<\/div><\/div>\n        <div class=\"cmc-row\"><span class=\"cmc-dot-t\">\u2713<\/span><div><strong>Stress-relief verification for precision gray iron components<\/strong>For precision machine tool bases and bearing housings in gray iron, we confirm whether the casting has been stress-relieved (550\u2013600\u00b0C) before machining. Machining a non-stress-relieved casting releases residual casting stresses, causing gradual distortion after machining. Stress-relieved castings are specified and verified for all precision gray iron work.<\/div><\/div>\n        <div class=\"cmc-row\"><span class=\"cmc-dot-t\">\u2713<\/span><div><strong>Conservative parameters on alloy iron \u2014 protect the CBN investment<\/strong>CBN inserts for alloy iron machining are expensive. We use conservative cutting speeds, confirmed chip load, and machine rigidity tests before beginning alloy iron operations \u2014 maximising CBN tool life and avoiding catastrophic edge failure on high-value wear part castings.<\/div><\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     6. TYPICAL PARTS\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"csec csec-white\">\n  <div class=\"cwrap\">\n    <div class=\"csec-head\">\n      <div>\n        <div class=\"clabel\">Application Gallery<\/div>\n        <h2 class=\"ch2\">Typical Cast Iron Parts <span style=\"color:var(--ci);\">We Machine<\/span><\/h2>\n      <\/div>\n    <\/div>\n    <div class=\"cparts-grid\">\n      <div class=\"cpart-card\">\n        <div class=\"cpc-img\">\n          <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Engine-Blocks-scaled.webp\" alt=\"Gray Cast Iron Engine Block Cylinder Head CNC Machined\">\n          <span class=\"cpc-badge cgray\">Gray Iron<\/span>\n        <\/div>\n        <div class=\"cpc-body\">\n          <div class=\"cpc-title\">Engine Blocks &amp; Cylinder Heads<\/div>\n          <div class=\"cpc-row\"><span class=\"cpc-k\">Material<\/span><span class=\"cpc-v\">Gray Iron HT250 \/ EN-GJL-250<\/span><\/div>\n          <div class=\"cpc-row\"><span class=\"cpc-k\">Process<\/span><span class=\"cpc-v\">CNC Milling \u00b7 Boring \u00b7 Honing<\/span><\/div>\n          <div class=\"cpc-row\"><span class=\"cpc-k\">Industry<\/span><span class=\"cpc-v\">Automotive \u00b7 Power Equipment<\/span><\/div>\n        <\/div>\n      <\/div>\n      <div class=\"cpart-card\">\n        <div class=\"cpc-img\">\n          <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Hydraulic-Valve-Bodies.webp\" alt=\"Ductile Iron Hydraulic Valve Body CNC Machined\">\n          <span class=\"cpc-badge cduct\">Ductile Iron<\/span>\n        <\/div>\n        <div class=\"cpc-body\">\n          <div class=\"cpc-title\">Hydraulic Valve Bodies &amp; Manifolds<\/div>\n          <div class=\"cpc-row\"><span class=\"cpc-k\">Material<\/span><span class=\"cpc-v\">Ductile Iron QT500 \/ EN-GJS-500-7<\/span><\/div>\n          <div class=\"cpc-row\"><span class=\"cpc-k\">Process<\/span><span class=\"cpc-v\">CNC Milling \u00b7 Boring \u00b7 Threading<\/span><\/div>\n          <div class=\"cpc-row\"><span class=\"cpc-k\">Industry<\/span><span class=\"cpc-v\">Hydraulics \u00b7 Fluid Power \u00b7 Mobile<\/span><\/div>\n        <\/div>\n      <\/div>\n      <div class=\"cpart-card\">\n        <div class=\"cpc-img\">\n          <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Machine-Tool-Bases.jpg\" alt=\"Gray Cast Iron Machine Tool Bed Base CNC Machined\">\n          <span class=\"cpc-badge cgray\">Gray Iron<\/span>\n        <\/div>\n        <div class=\"cpc-body\">\n          <div class=\"cpc-title\">Machine Tool Bases &amp; Beds<\/div>\n          <div class=\"cpc-row\"><span class=\"cpc-k\">Material<\/span><span class=\"cpc-v\">Gray Iron HT300 \/ EN-GJL-300<\/span><\/div>\n          <div class=\"cpc-row\"><span class=\"cpc-k\">Process<\/span><span class=\"cpc-v\">Face Milling \u00b7 Grinding \u00b7 Scraping<\/span><\/div>\n          <div class=\"cpc-row\"><span class=\"cpc-k\">Industry<\/span><span class=\"cpc-v\">Machine Tools \u00b7 Industrial Equipment<\/span><\/div>\n        <\/div>\n      <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     7. INDUSTRIES\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"csec csec-light\">\n  <div class=\"cwrap\">\n    <div style=\"text-align:center;margin-bottom:40px;\">\n      <div class=\"clabel\" style=\"justify-content:center;\">Industries Served<\/div>\n      <h2 class=\"ch2\">Cast Iron Across <span style=\"color:var(--ci);\">Every Heavy Industry<\/span><\/h2>\n    <\/div>\n    <div class=\"cind-row\">\n      <div class=\"cind-mini\"><div class=\"cim-icon\">\ud83d\ude97<\/div><div class=\"cim-name\">Automotive<\/div><div class=\"cim-grade\">Gray &amp; Ductile<\/div><\/div>\n      <div class=\"cind-mini\"><div class=\"cim-icon\">\u2699<\/div><div class=\"cim-name\">Machine Tools<\/div><div class=\"cim-grade\">Gray Iron<\/div><\/div>\n      <div class=\"cind-mini\"><div class=\"cim-icon\">\ud83d\udca7<\/div><div class=\"cim-name\">Pumps &amp; Valves<\/div><div class=\"cim-grade\">Gray &amp; Ductile<\/div><\/div>\n      <div class=\"cind-mini\"><div class=\"cim-icon\">\u26cf<\/div><div class=\"cim-name\">Mining<\/div><div class=\"cim-grade\">Alloy Iron<\/div><\/div>\n      <div class=\"cind-mini\"><div class=\"cim-icon\">\ud83c\udfd7<\/div><div class=\"cim-name\">Heavy Machinery<\/div><div class=\"cim-grade\">Ductile Iron<\/div><\/div>\n      <div class=\"cind-mini\"><div class=\"cim-icon\">\ud83d\udd25<\/div><div class=\"cim-name\">High Temp<\/div><div class=\"cim-grade\">Ni-Resist<\/div><\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     9. PROCESS FLOW\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"csec csec-light\">\n  <div class=\"cwrap\">\n    <div style=\"text-align:center;margin-bottom:48px;\">\n      <div class=\"clabel\" style=\"justify-content:center;\">From Raw Casting to Finished Part<\/div>\n      <h2 class=\"ch2\">How We Produce <span style=\"color:var(--ci);\">Cast Iron Parts<\/span><\/h2>\n    <\/div>\n    <div class=\"cflow-strip\">\n      <div class=\"cflow-step\">\n        <div class=\"cfs-body\">\n          <div class=\"cfs-num\">STEP 01<\/div>\n          <div class=\"cfs-title\">Casting Review &amp; Datum Check<\/div>\n          <div class=\"cfs-desc\">Incoming casting inspected for surface condition, casting standard cert, and stock allowance on all machined faces. Stress-relief and hardness verified before release to machining.<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"cflow-step\">\n        <div class=\"cfs-body\">\n          <div class=\"cfs-num\">STEP 02<\/div>\n          <div class=\"cfs-title\">Rough Machining \u2014 Skin Removal<\/div>\n          <div class=\"cfs-desc\">First pass programmed deep enough to fully clear hard as-cast skin on all faces. Grade-specific tooling: uncoated carbide (gray), coated carbide (ductile), CBN (alloy iron).<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"cflow-step\">\n        <div class=\"cfs-body\">\n          <div class=\"cfs-num\">STEP 03<\/div>\n          <div class=\"cfs-title\">Finish Machining<\/div>\n          <div class=\"cfs-desc\">Final bores, mating faces, thread holes, and precision features. Boring and honing for critical bearing and seating surfaces. Dry or MQL as required by grade.<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"cflow-step\">\n        <div class=\"cfs-body\">\n          <div class=\"cfs-num\">STEP 04<\/div>\n          <div class=\"cfs-title\">Surface Treatment<\/div>\n          <div class=\"cfs-desc\">Rust preventive oil, phosphate coating, zinc plating, or paint as specified. Machined faces and bores masked where protective coating must not be applied.<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"cflow-step\">\n        <div class=\"cfs-body\">\n          <div class=\"cfs-num\">STEP 05<\/div>\n          <div class=\"cfs-title\">Inspection &amp; Delivery<\/div>\n          <div class=\"cfs-desc\">CMM dimensional report, casting cert, hardness records (alloy iron), and pressure test records where applicable \u2014 all shipped with the order.<\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     10. SURFACE TREATMENTS\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"csec csec-white\">\n  <div class=\"cwrap\">\n    <div class=\"csec-head\">\n      <div>\n        <div class=\"clabel\">Post-Processing<\/div>\n        <h2 class=\"ch2\">Surface Treatments for <span class=\"cteal\">Cast Iron Parts<\/span><\/h2>\n      <\/div>\n    <\/div>\n    <p style=\"font-size:14px;color:var(--text-2);line-height:1.75;max-width:720px;margin-bottom:32px;\">Cast iron has limited inherent corrosion resistance \u2014 the graphite-iron matrix corrodes in humid environments. Surface treatment requirements range from simple rust-preventive oil for internal components to full paint or plating systems for external parts in wet service.<\/p>\n    <div class=\"csf-grid\">\n      <div class=\"csf-card\">\n        <div class=\"csf-body\">\n          <div class=\"csf-name\">Rust Preventive Oil \/ VCI<\/div>\n          <div class=\"csf-desc\">The simplest and most common finish for cast iron internal machine components. A rust-preventive oil film or VCI (vapor corrosion inhibitor) paper provides protection during shipping and storage. Machined faces are oiled, unmachined surfaces left as-cast. Standard for machine tool bases, gearbox housings, and industrial equipment castings.<\/div>\n          <div class=\"csf-tags\"><span class=\"csft\">All Grades<\/span><span class=\"csft\">Machine Parts<\/span><span class=\"csft\">Internal Components<\/span><\/div>\n        <\/div>\n      <\/div>\n      <div class=\"csf-card\">\n        <div class=\"csf-body\">\n          <div class=\"csf-name\">Phosphate &amp; Black Oxide<\/div>\n          <div class=\"csf-desc\">Zinc phosphate (Parkerizing) creates a porous layer that retains oil for corrosion protection and improved paint adhesion. Black oxide provides a uniform dark appearance with minimal dimensional change. Both are used on automotive cast iron components, valve bodies, and hydraulic parts where appearance and mild corrosion protection are needed.<\/div>\n          <div class=\"csf-tags\"><span class=\"csft\">Gray &amp; Ductile<\/span><span class=\"csft\">Automotive<\/span><span class=\"csft\">Low Cost<\/span><\/div>\n        <\/div>\n      <\/div>\n      <div class=\"csf-card\">\n        <div class=\"csf-body\">\n          <div class=\"csf-name\">Epoxy Paint &amp; Powder Coating<\/div>\n          <div class=\"csf-desc\">Two-component epoxy paint or polyester powder coating for cast iron pump housings, valve bodies, and outdoor equipment in wet or corrosive environments. Machined bores and seating faces are masked before painting. Provides excellent corrosion protection for cast iron in water, chemicals, and outdoor service. Full RAL\/Pantone color matching available.<\/div>\n          <div class=\"csf-tags\"><span class=\"csft\">Pump Housings<\/span><span class=\"csft\">Outdoor<\/span><span class=\"csft\">Wet Service<\/span><\/div>\n        <\/div>\n      <\/div>\n      <div class=\"csf-card\">\n        <div class=\"csf-body\">\n          <div class=\"csf-name\">Zinc Plating &amp; Electroless Nickel<\/div>\n          <div class=\"csf-desc\">Zinc electroplating for corrosion protection on ductile iron fasteners, brackets, and small hydraulic components. Electroless nickel for dimensional uniformity and corrosion resistance on precision ductile iron valve bodies and instrument parts. Note: gray iron requires special pre-treatment before acid plating processes due to graphite flake porosity \u2014 confirm with plating house before specifying.<\/div>\n          <div class=\"csf-tags\"><span class=\"csft\">Ductile Iron<\/span><span class=\"csft\">Small Parts<\/span><span class=\"csft\">Pre-Treatment Req.<\/span><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- METRICS BAR -->\n<div class=\"cmetrics\">\n  <div class=\"cmetric\"><div class=\"cmetric-val\">3<\/div><div class=\"cmetric-lbl\">Cast Iron Grades<\/div><\/div>\n  <div class=\"cmetric\"><div class=\"cmetric-val\">900 <span class=\"cmetric-unit\">MPa<\/span><\/div><div class=\"cmetric-lbl\">Ductile Iron Tensile<\/div><\/div>\n  <div class=\"cmetric\"><div class=\"cmetric-val\">HRC 65<\/div><div class=\"cmetric-lbl\">Alloy Iron Max Hardness<\/div><\/div>\n  <div class=\"cmetric\"><div class=\"cmetric-val\">24<span class=\"cmetric-unit\">hr<\/span><\/div><div class=\"cmetric-lbl\">Quote Turnaround<\/div><\/div>\n<\/div>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     11. WHY US\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"csec csec-white\">\n  <div class=\"cwrap\">\n    <div class=\"cwhy-layout\">\n      <div class=\"cwhy-img\">\n        <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Technical-Specifications.jpg\" alt=\"Cast Iron CNC Machining Workshop Boring Milling Gray Ductile\">\n      <\/div>\n      <div>\n        <div class=\"clabel\">Why Work With Us<\/div>\n        <h2 class=\"ch2\" style=\"margin-bottom:24px;\">Why Choose Us for <span style=\"color:var(--ci);\">Cast Iron Machining<\/span><\/h2>\n        <div class=\"cwhy-points\">\n          <div class=\"cwp-item\">\n            <div class=\"cwp-ico\">SKN<\/div>\n            <div>\n              <div class=\"cwp-title\">Skin-Clearing First Pass \u2014 No Tooling Disasters on Your Casting<\/div>\n              <div class=\"cwp-desc\">We program every cast iron job with a first-pass depth that fully clears the hard as-cast skin. This single discipline prevents the most common and costly cast iron machining failure: destroying a \u2265\u00bd shift setup because the first pass cut too shallow.<\/div>\n            <\/div>\n          <\/div>\n          <div class=\"cwp-item\">\n            <div class=\"cwp-ico\">CBN<\/div>\n            <div>\n              <div class=\"cwp-title\">CBN Capability for Alloy Cast Iron \u2014 No Outsourcing<\/div>\n              <div class=\"cwp-desc\">High-chromium white iron and Ni-Hard require CBN tooling that most CNC shops decline to stock. We machine alloy cast iron wear parts in-house with CBN and PCBN \u2014 hardness spot-checked and dimensional CMM-verified on every piece.<\/div>\n            <\/div>\n          <\/div>\n          <div class=\"cwp-item\">\n            <div class=\"cwp-ico\">STR<\/div>\n            <div>\n              <div class=\"cwp-title\">Stress-Relief Confirmation Before Precision Gray Iron Work<\/div>\n              <div class=\"cwp-desc\">For precision machine bases, bearing housings, and flatness-critical gray iron components, we verify that the casting has been stress-relieved before machining \u2014 preventing the gradual post-machine distortion that ruins precision gray iron work.<\/div>\n            <\/div>\n          <\/div>\n          <div class=\"cwp-item\">\n            <div class=\"cwp-ico\">DOC<\/div>\n            <div>\n              <div class=\"cwp-title\">Full Casting Documentation \u2014 ASTM, CMM, Hardness<\/div>\n              <div class=\"cwp-desc\">Every cast iron order ships with casting material certificate (ASTM A48, A536, or A532), CMM dimensional report, and hardness records for alloy iron. Pressure test records where applicable. No document chasing after delivery.<\/div>\n            <\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     FAQ\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"csec csec-light\">\n  <div class=\"cwrap\">\n    <div class=\"cfaq-layout\">\n      <div>\n        <div class=\"clabel\">FAQ<\/div>\n        <h2 class=\"ch2\">Frequently Asked <span class=\"cblue\">Questions<\/span><\/h2>\n        <p style=\"font-size:14px;color:var(--text-2);line-height:1.75;margin-top:16px;\">Common questions about gray cast iron, ductile iron, and alloy cast iron \u2014 grade selection, machining challenges, tolerances, tooling, surface treatment, and welding.<\/p>\n        <div style=\"margin-top:28px;display:flex;flex-direction:column;gap:10px;\">\n          <a href=\"#ciquote\" class=\"cbtn cbtn-primary cbtn-sm\">Talk to an Engineer<\/a>\n          <a href=\"\/material\/steel\/\" class=\"cbtn cbtn-outline cbtn-sm\">\u2190 Carbon &amp; Alloy Steel<\/a>\n          <a href=\"\/material\/nickel-alloys\/\" class=\"cbtn cbtn-outline cbtn-sm\">\u2190 Nickel Alloys<\/a>\n        <\/div>\n      <\/div>\n\n      <div class=\"cfaq-list\" itemscope itemtype=\"https:\/\/schema.org\/FAQPage\">\n\n        <div class=\"cfaq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"cfaq-q\" onclick=\"cirfaq(this)\" itemprop=\"name\">What is cast iron and why is it used for CNC machining?<span class=\"cfaq-icon\">+<\/span><\/button>\n          <div class=\"cfaq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Cast iron is a family of iron-carbon alloys with carbon content greater than 2% (typically 2.5\u20134.5%), which causes the excess carbon to precipitate as graphite or iron carbide during solidification. This microstructure gives cast iron its defining characteristics: excellent compressive strength, outstanding vibration damping, inherent lubricity from graphite, and very good machinability despite its hardness. Cast iron is widely used for machine tool bases, engine blocks, pump housings, brake components, and heavy-duty structural parts where rigidity, wear resistance, and dimensional stability are required.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"cfaq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"cfaq-q\" onclick=\"cirfaq(this)\" itemprop=\"name\">What is gray cast iron and what are its main applications?<span class=\"cfaq-icon\">+<\/span><\/button>\n          <div class=\"cfaq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Gray cast iron is the most widely used cast iron grade, characterized by graphite precipitating as flake graphite within a pearlitic or ferritic iron matrix. Common grades include ASTM A48 Class 20\u201340, ISO EN-GJL-150 to EN-GJL-300, and GB HT150\u2013HT350. Gray cast iron offers outstanding machinability, excellent vibration damping, good compressive strength, and low cost. It is used for engine blocks, cylinder heads, machine tool bases, brake drums, pump bodies, and gearbox housings. Its tensile strength is moderate (150\u2013350 MPa) but compressive strength is 3\u20135 times higher.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"cfaq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"cfaq-q\" onclick=\"cirfaq(this)\" itemprop=\"name\">What is ductile cast iron (nodular iron) and how does it differ from gray cast iron?<span class=\"cfaq-icon\">+<\/span><\/button>\n          <div class=\"cfaq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Ductile cast iron is produced by adding magnesium to the melt, which causes graphite to solidify as spherical nodules rather than flakes. This dramatically improves tensile strength (400\u2013900 MPa), elongation (up to 18%), and impact resistance compared to gray cast iron \u2014 giving properties approaching those of steel while retaining excellent machinability. Common grades include ASTM A536 Grade 65-45-12, 80-55-06, and EN-GJS-400-18 to EN-GJS-700-2. Ductile iron is used for crankshafts, gears, differential housings, hydraulic valve bodies, and structural components requiring both the machinability of cast iron and higher mechanical strength.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"cfaq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"cfaq-q\" onclick=\"cirfaq(this)\" itemprop=\"name\">What is alloy cast iron and when should it be specified?<span class=\"cfaq-icon\">+<\/span><\/button>\n          <div class=\"cfaq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Alloy cast iron incorporates additions of chromium, nickel, molybdenum, or copper to produce properties beyond those of standard gray or ductile iron. High-chromium white iron (15\u201330% Cr) achieves HRC 55\u201365 for extreme abrasion resistance. Ni-Hard provides excellent wear resistance with improved toughness. Austenitic Ni-Resist iron offers corrosion resistance and dimensional stability at elevated temperatures up to 800\u00b0C. Alloy cast irons are specified when standard cast irons fail due to abrasive wear, elevated temperature, or corrosive service \u2014 they are significantly harder to machine and require CBN tooling.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"cfaq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"cfaq-q\" onclick=\"cirfaq(this)\" itemprop=\"name\">What are the main machining challenges with cast iron?<span class=\"cfaq-icon\">+<\/span><\/button>\n          <div class=\"cfaq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Cast iron machining presents several specific challenges: (1) Hard skin \u2014 the as-cast surface contains scale, sand inclusions, and a hard chilled layer that rapidly destroys tooling if the first pass does not cut below it. (2) Abrasive graphite \u2014 graphite flakes accelerate flank wear on carbide tools. (3) Dry or near-dry machining \u2014 cast iron is often machined dry or with MQL as flood coolant can cause thermal shock. (4) Porosity \u2014 internal voids can cause dimensional surprises when machining thin walls. (5) Alloy iron hardness variation \u2014 high-chromium white iron can vary significantly in hardness across a single casting.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"cfaq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"cfaq-q\" onclick=\"cirfaq(this)\" itemprop=\"name\">What tolerances can you hold on cast iron CNC machined parts?<span class=\"cfaq-icon\">+<\/span><\/button>\n          <div class=\"cfaq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Standard CNC machining tolerance for gray and ductile cast iron is \u00b10.02 mm for turned features and \u00b10.05 mm for milled features. For precision bearing bores and sealing faces, we hold \u00b10.010\u20130.015 mm on gray and ductile iron. Alloy cast iron typically achieves \u00b10.02\u20130.03 mm on machined features due to hardness variability. Note that castings themselves have inherent dimensional variation \u2014 datum selection and fixturing strategy must account for casting variability before machining begins. CMM reports are provided for all precision cast iron components.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"cfaq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"cfaq-q\" onclick=\"cirfaq(this)\" itemprop=\"name\">Does cast iron need surface treatment after machining?<span class=\"cfaq-icon\">+<\/span><\/button>\n          <div class=\"cfaq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Cast iron has limited inherent corrosion resistance and the graphite-iron matrix corrodes in humid or wet environments. Surface treatment depends on application: machine tool bases and internal components are often supplied with rust-preventive oil only. Parts in moderate environments receive black oxide, phosphate coating, or zinc plating. Pump bodies and valve housings in wet service receive epoxy paint or powder coating. Note that gray cast iron should not be electroplated with acid processes without proper pre-treatment, as the graphite flake network can trap hydrogen and cause blistering.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"cfaq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"cfaq-q\" onclick=\"cirfaq(this)\" itemprop=\"name\">Can cast iron be welded or heat treated after machining?<span class=\"cfaq-icon\">+<\/span><\/button>\n          <div class=\"cfaq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Cast iron welding is possible but requires specialized procedures. Gray cast iron must be preheated to 300\u2013600\u00b0C before welding to prevent heat-affected zone cracking. Nickel-based or cast iron welding rods are used. Ductile iron is more weldable than gray iron but still requires preheat. High-chromium alloy irons are generally considered unweldable. For heat treatment: gray cast iron can be stress-relieved (550\u2013600\u00b0C) to reduce residual casting stresses before precision machining. Ductile iron can be annealed to soften, or normalized and quenched and tempered to increase hardness.<\/div>\n          <\/div>\n        <\/div>\n\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<\/div><!-- end .CIR -->\n\n<script>\nfunction cirfaq(btn){\n  var open = btn.classList.contains('copen');\n  document.querySelectorAll('.CIR .cfaq-q').forEach(function(b){\n    b.classList.remove('copen');\n    var a = b.nextElementSibling;\n    if(a) a.classList.remove('copen');\n  });\n  if(!open){\n    btn.classList.add('copen');\n    var a = btn.nextElementSibling;\n    if(a) a.classList.add('copen');\n  }\n}\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-60ef0c48 e-con-full ciquote e-flex e-con e-parent\" data-id=\"60ef0c48\" data-element_type=\"container\" data-e-type=\"container\" id=\"ciquote\">\n\t\t<div class=\"elementor-element elementor-element-4e260072 e-con-full e-flex e-con e-child\" data-id=\"4e260072\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-465b104c elementor-widget elementor-widget-html\" data-id=\"465b104c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<!-- HXCNC CTA Left Panel | namespace .HXCL | Elementor HTML Widget -->\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Roboto:wght@300;400;500;700;900&family=Roboto+Condensed:wght@400;700;900&family=Roboto+Mono:wght@400;500&display=swap\" rel=\"stylesheet\">\n<style>\n.HXCL{\n  --bg:#F7F9FC;--wh:#FFFFFF;--lt:#EEF3F8;\n  --tx:#1F2937;--tx1:#5B6777;--tx2:#9CA8B4;--bd:#D7E0EA;\n  --a:#2563EB;--a2:#1D4ED8;--aA:rgba(37,99,235,.07);--aC:rgba(37,99,235,.20);\n  --ac:#0F766E;--acA:rgba(15,118,110,.08);--acB:rgba(15,118,110,.15);--acC:rgba(15,118,110,.22);\n  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Quote.<\/em>\n  <\/h2>\n\n  <p class=\"sub\">Every enquiry includes a DFM review \u2014 tolerance feasibility, material confirmation, and process approach confirmed before production starts. MOQ 1 piece.<\/p>\n\n  <!-- Stats row -->\n  <div class=\"stats\">\n    <div class=\"stat\">\n      <div class=\"sv\">24<small>hr<\/small><\/div>\n      <div class=\"sl\">Quote Response<\/div>\n    <\/div>\n    <div class=\"stat\">\n      <div class=\"sv\">MOQ <small>1<\/small><\/div>\n      <div class=\"sl\">Prototypes OK<\/div>\n    <\/div>\n    <div class=\"stat\">\n      <div class=\"sv\">ISO<\/div>\n      <div class=\"sl\">9001:2015<\/div>\n    <\/div>\n  <\/div>\n\n  <!-- Advantage list -->\n  <div class=\"avlist\">\n    <div class=\"avitem\">\n      <div class=\"ico\">&#128208;<\/div>\n      <div>\n        <div class=\"at\">DFM Review on Every Enquiry<\/div>\n        <div class=\"ad\">Tolerance feasibility, fixturing strategy, and material confirmation. Specific, actionable feedback \u2014 not generic pushback.<\/div>\n      <\/div>\n    <\/div>\n    <div class=\"avitem\">\n      <div class=\"ico\">&#127919;<\/div>\n      <div>\n        <div class=\"at\">First Article Inspection \u2014 Standard<\/div>\n        <div class=\"ad\">FAI report on every new run. Material certs and surface treatment certs included with every shipment.<\/div>\n      <\/div>\n    <\/div>\n    <div class=\"avitem\">\n      <div class=\"ico\">&#128260;<\/div>\n      <div>\n        <div class=\"at\">Same Process: Prototype to Production<\/div>\n        <div class=\"ad\">Process plan from your prototype applies to production batches. No re-qualification when you scale.<\/div>\n      <\/div>\n    <\/div>\n    <div class=\"avitem\">\n      <div class=\"ico\">&#9881;<\/div>\n      <div>\n        <div class=\"at\">3 \/ 4 \/ 5-Axis CNC + Turning<\/div>\n        <div class=\"ad\">Complex structural parts, shafts, housings, and transmission components. Metals and engineering plastics.<\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <!-- Cert tags -->\n  <div class=\"certs\">\n    <span class=\"cert hi\">ISO 9001:2015<\/span>\n    <span class=\"cert\">3\/4\/5-Axis Milling<\/span>\n    <span class=\"cert\">CNC Turning<\/span>\n    <span class=\"cert\">CMM Inspection<\/span>\n    <span class=\"cert\">Global Delivery<\/span>\n  <\/div>\n\n<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6b40d9da e-con-full e-flex e-con e-child\" data-id=\"6b40d9da\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2a1382f elementor-button-align-stretch elementor-widget elementor-widget-form\" data-id=\"2a1382f\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;step_next_label&quot;:&quot;Next&quot;,&quot;step_previous_label&quot;:&quot;Previous&quot;,&quot;button_width&quot;:&quot;100&quot;,&quot;step_type&quot;:&quot;number_text&quot;,&quot;step_icon_shape&quot;:&quot;circle&quot;}\" data-widget_type=\"form.default\">\n\t\t\t\t\t\t\t<form class=\"elementor-form\" method=\"post\" name=\"New Form\" aria-label=\"New Form\">\n\t\t\t<input type=\"hidden\" name=\"post_id\" value=\"219\"\/>\n\t\t\t<input type=\"hidden\" name=\"form_id\" value=\"2a1382f\"\/>\n\t\t\t<input type=\"hidden\" name=\"referer_title\" value=\"Cast Iron CNC Machining | Gray, Ductile &amp; Nodular Iron | HXCNC\" \/>\n\n\t\t\t\t\t\t\t<input type=\"hidden\" name=\"queried_id\" value=\"219\"\/>\n\t\t\t\n\t\t\t<div class=\"elementor-form-fields-wrapper elementor-labels-above\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-text elementor-field-group elementor-column elementor-field-group-name elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-name\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tName\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"text\" name=\"form_fields[name]\" id=\"form-field-name\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Name\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-text elementor-field-group elementor-column elementor-field-group-field_12786b6 elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-field_12786b6\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tCompany\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"text\" name=\"form_fields[field_12786b6]\" id=\"form-field-field_12786b6\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Company Name\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-email elementor-field-group elementor-column elementor-field-group-email elementor-col-100 elementor-field-required\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-email\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tEmail\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"email\" name=\"form_fields[email]\" id=\"form-field-email\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Email\" required=\"required\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-select elementor-field-group elementor-column elementor-field-group-field_0c79fc0 elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-field_0c79fc0\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tMaterial\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field elementor-select-wrapper remove-before \">\n\t\t\t<div class=\"select-caret-down-wrapper\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-eicon-caret-down\" viewBox=\"0 0 571.4 571.4\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M571 393Q571 407 561 418L311 668Q300 679 286 679T261 668L11 418Q0 407 0 393T11 368 36 357H536Q550 357 561 368T571 393Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t\t<select name=\"form_fields[field_0c79fc0]\" id=\"form-field-field_0c79fc0\" class=\"elementor-field-textual elementor-size-sm\">\n\t\t\t\t\t\t\t\t\t<option value=\"aluminium_6061_t6\">Aluminium 6061-T6<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"aluminium_7075_t6\">Aluminium 7075-T6<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"stainless_steel_304\">Stainless Steel 304<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"stainless_steel_316l\">Stainless Steel 316L<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"carbon_steel_4140\">Carbon Steel \/ 4140<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"titanium_ti_6al_4v\">Titanium Ti-6Al-4V<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"brass_c360\">Brass C360<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"copper\">Copper<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"peek\">PEEK<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"pom_acetal\">POM \/ Acetal<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"nylon_pa6_pa66\">Nylon PA6 \/ PA66<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"ptfe_teflon\">PTFE \/ Teflon<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"polycarbonate\">Polycarbonate<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"abs\">ABS<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"other_not_sure\">Other \/ Not sure<\/option>\n\t\t\t\t\t\t\t<\/select>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-select elementor-field-group elementor-column elementor-field-group-field_161b5ef elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-field_161b5ef\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tSurface Finish\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field elementor-select-wrapper remove-before \">\n\t\t\t<div class=\"select-caret-down-wrapper\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-eicon-caret-down\" viewBox=\"0 0 571.4 571.4\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M571 393Q571 407 561 418L311 668Q300 679 286 679T261 668L11 418Q0 407 0 393T11 368 36 357H536Q550 357 561 368T571 393Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t\t<select name=\"form_fields[field_161b5ef]\" id=\"form-field-field_161b5ef\" class=\"elementor-field-textual elementor-size-sm\">\n\t\t\t\t\t\t\t\t\t<option value=\"as_machined\">As-machined<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"anodised_type_ii\">Anodised Type II<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"anodised_type_iii_hard\">Anodised Type III (Hard)<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"electroplating\">Electroplating<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"powder_coating\">Powder Coating<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"black_oxide\">Black Oxide<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"passivation_ss\">Passivation (SS)<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"polishing_ra_requirement\">Polishing \/ Ra requirement<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"other_specify_below\">Other (specify below)<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"Select \">Select finish (optional)<\/option>\n\t\t\t\t\t\t\t<\/select>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-textarea elementor-field-group elementor-column elementor-field-group-message elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-message\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tAdditional Requirements\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t<textarea class=\"elementor-field-textual elementor-field  elementor-size-sm\" name=\"form_fields[message]\" id=\"form-field-message\" rows=\"4\" placeholder=\"Target delivery date, critical dimensions, tolerance callouts, inspection requirements, application 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\u00b7 Bases Wear Parts \u00b7 Valves \u00b7 Brake Components Precision CNC machining of gray cast iron, ductile (nodular) iron, and alloy [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-219","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Cast Iron CNC Machining | Gray, Ductile &amp; Nodular Iron | HXCNC<\/title>\n<meta name=\"description\" content=\"CNC machining of cast iron including gray iron, ductile iron and nodular iron. 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