{"id":158,"date":"2026-04-02T16:40:31","date_gmt":"2026-04-02T16:40:31","guid":{"rendered":"https:\/\/hxcnc.com\/?page_id=158"},"modified":"2026-05-14T05:51:30","modified_gmt":"2026-05-14T05:51:30","slug":"martensitic-stainless-steel-machining","status":"publish","type":"page","link":"https:\/\/hxcnc.com\/ro\/martensitic-stainless-steel-machining\/","title":{"rendered":"Prelucrare a o\u021belului inoxidabil martensitic"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"158\" class=\"elementor elementor-158\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-db34693 e-con-full e-flex e-con e-parent\" data-id=\"db34693\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-803e2a2 elementor-widget elementor-widget-html\" data-id=\"803e2a2\" 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 martensitic stainless steel and how does it differ from austenitic stainless?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Martensitic stainless steels are a family of chromium-alloyed steels (typically 11\u201318% Cr) that can be hardened by heat treatment \u2014 quenching and tempering \u2014 to achieve high hardness values up to HRC 60. Unlike austenitic grades (304, 316) which are non-hardenable and prized for corrosion resistance, martensitic grades trade some corrosion resistance for the ability to achieve high hardness, wear resistance, and edge retention. They are the only stainless steel family that can be through-hardened like tool steel, making them suitable for knives, bearings, valve components, and wear-critical precision parts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between 410, 420, and 440C stainless steel?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The three grades differ primarily in carbon content, which determines maximum achievable hardness and wear resistance. 410 has the lowest carbon (0.08\u20130.15%), making it the most weldable and toughest of the three \u2014 used for general structural parts, valve bodies, and pump components where moderate hardness suffices. 420 has higher carbon (0.15\u20130.40%) enabling hardness to HRC 50\u201352, with better wear resistance \u2014 common for cutlery, surgical instruments, and dental tools. 440C has the highest carbon (0.95\u20131.20%) of any standard stainless steel, achieving HRC 58\u201360 after heat treatment \u2014 the hardest stainless available, used for ball bearings, high-quality knives, valve seats, and precision wear surfaces.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can martensitic stainless steel be welded?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Martensitic stainless steels can be welded but require pre-heat and post-weld heat treatment to avoid cold cracking and hardened heat-affected zones. 410 has the best weldability of the three grades. 420 requires more care. 440C is generally considered difficult to weld and is rarely specified for welded assemblies \u2014 its high carbon content makes HAZ cracking a significant risk. If your part requires welding and stainless properties, consider austenitic 304L or 316L instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the maximum hardness achievable for 410, 420, and 440C?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"After quench and temper heat treatment: 410 achieves HRC 35\u201342 depending on tempering temperature. 420 achieves HRC 50\u201352. 440C achieves HRC 58\u201360 \u2014 the highest hardness of any standard stainless steel grade. These hardness values are achievable after proper austenitizing, quenching, and tempering. We coordinate heat treatment as part of the machining order, with hardness testing verification provided.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How should martensitic stainless steel be machined \u2014 before or after heat treatment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Parts are typically rough-machined in the annealed or pre-hardened condition, heat-treated to final hardness, then finish-ground or precision-turned on critical surfaces to recover final tolerance after heat treatment distortion. Machining in the hardened condition (particularly 440C at HRC 58\u201360) requires CBN tooling or grinding and is significantly more expensive. Our standard sequence is: rough machine \u2192 heat treat \u2192 finish grind critical dimensions \u2192 CMM verification. This sequence is coordinated and managed by us as a single-source process.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What surface treatments are suitable for martensitic stainless steel?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Unlike austenitic grades, martensitic stainless steel cannot be passivated as effectively due to lower chromium content and the presence of carbides. Common surface treatments include: passivation (improves corrosion resistance modestly \u2014 ASTM A967), black oxide (light protection, minimal dimensional change), PVD coating (for 440C cutting tools and wear surfaces \u2014 adds TiN or CrN wear layer), and polishing or superfinishing (for bearing surfaces and sealing faces). Hard chrome plating is also used on 410 valve stems and pump shafts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is 440C stainless steel used for in CNC machining?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"440C is primarily used in applications requiring the highest achievable hardness in a stainless steel combined with moderate corrosion resistance. CNC machining applications include: precision ball bearings and bearing races, high-quality knife blades and cutting tools, valve seats and valve balls requiring corrosion resistance plus wear resistance, pump impeller wear rings, precision dies and forming tools, dental and surgical instruments requiring edge retention, and nozzle seats in fluid control systems.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is martensitic stainless steel magnetic?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Unlike austenitic stainless steels (304, 316) which are non-magnetic in the annealed condition, martensitic stainless steels (410, 420, 440C) are ferromagnetic \u2014 strongly magnetic in both the annealed and hardened condition. This is due to their body-centered cubic (BCC) or body-centered tetragonal (BCT in hardened state) crystal structure. If non-magnetic properties are required for your application, specify an austenitic grade instead.\"\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:root{\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);\n  --ff-h:'Roboto Condensed',sans-serif;\n  --ff-b:'Roboto',sans-serif;\n  --ff-m:'Roboto Mono',monospace;\n  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1fr;gap:8px;margin-top:8px;}\n.hrc-ref-item{padding:10px 12px;background:var(--bg-light);border:1px solid var(--border);border-radius:var(--r2);font-size:12px;color:var(--text-2);display:flex;gap:6px;align-items:center;}\n.hrc-ref-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0;}\n\n\/* \u2550\u2550 HEAT TREATMENT FLOW \u2550\u2550 *\/\n.ht-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;background:#fff;}\n@media(max-width:768px){.ht-flow{grid-template-columns:1fr 1fr;}}\n.ht-step{padding:24px 20px;border-right:1px solid var(--border);text-align:center;transition:background 0.18s;}\n.ht-step:last-child{border-right:none;}\n.ht-step:hover{background:var(--bg-light);}\n.ht-ico{width:48px;height:48px;border-radius:50%;background:var(--blue-dim);border:1.5px solid rgba(37,99,235,0.2);display:flex;align-items:center;justify-content:center;font-size:20px;margin:0 auto 12px;}\n.ht-title{font-family:var(--ff-h);font-size:14px;font-weight:700;color:var(--text-1);margin-bottom:6px;}\n.ht-temp{font-family:var(--ff-m);font-size:11px;color:var(--blue);margin-bottom:6px;}\n.ht-desc{font-size:11px;color:var(--text-2);line-height:1.55;}\n\n\/* \u2550\u2550 MACHINING CONSIDERATIONS \u2550\u2550 *\/\n.mach-consider{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:32px;}\n@media(max-width:700px){.mach-consider{grid-template-columns:1fr;}}\n.mc-box{padding:24px;background:#fff;border:1.5px solid var(--border);border-radius:var(--r3);}\n.mc-box-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.mc-box-ico{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:14px;flex-shrink:0;}\n.mc-box-ico-red{background:rgba(239,68,68,0.1);}\n.mc-box-ico-blue{background:var(--blue-dim);}\n.mc-row{display:flex;gap:8px;align-items:flex-start;font-size:13px;color:var(--text-2);margin-bottom:9px;line-height:1.55;}\n.mc-row:last-child{margin-bottom:0;}\n.mc-dot-red{color:#DC2626;font-weight:700;flex-shrink:0;}\n.mc-dot-blue{color:var(--blue);font-weight:700;flex-shrink:0;}\n.mc-row strong{color:var(--text-1);font-weight:600;display:block;margin-bottom:1px;}\n\n\/* \u2550\u2550 CAPABILITIES \u2550\u2550 *\/\n.cap-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}\n@media(max-width:900px){.cap-grid{grid-template-columns:1fr 1fr;}}\n@media(max-width:500px){.cap-grid{grid-template-columns:1fr;}}\n.cap-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;transition:all 0.22s;}\n.cap-card:hover{border-color:var(--blue);transform:translateY(-3px);box-shadow:0 10px 28px rgba(37,99,235,0.1);}\n.cc-img{aspect-ratio:16\/9;overflow:hidden;}\n.cc-img img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}\n.cap-card:hover .cc-img img{transform:scale(1.05);}\n.cc-body{padding:18px;}\n.cc-num{font-family:var(--ff-m);font-size:10px;color:var(--text-3);letter-spacing:2px;margin-bottom:8px;}\n.cc-title{font-family:var(--ff-h);font-size:15px;font-weight:700;color:var(--text-1);margin-bottom:7px;}\n.cc-desc{font-size:12px;color:var(--text-2);line-height:1.65;margin-bottom:10px;}\n.cc-tags{display:flex;flex-wrap:wrap;gap:4px;}\n.cct{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\/* \u2550\u2550 TYPICAL PARTS \u2550\u2550 *\/\n.parts-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;}\n@media(max-width:800px){.parts-grid{grid-template-columns:1fr 1fr;}}\n@media(max-width:500px){.parts-grid{grid-template-columns:1fr;}}\n.part-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;transition:all 0.22s;cursor:pointer;}\n.part-card:hover{border-color:var(--blue);transform:translateY(-3px);box-shadow:0 10px 28px rgba(37,99,235,0.1);}\n.pc-img{aspect-ratio:4\/3;overflow:hidden;position:relative;}\n.pc-img img{width:100%;height:100%;object-fit:cover;transition:transform 0.45s;}\n.part-card:hover .pc-img img{transform:scale(1.07);}\n.pc-badge{position:absolute;top:10px;left:10px;padding:3px 10px;border-radius:100px;background:rgba(255,255,255,0.9);backdrop-filter:blur(4px);font-family:var(--ff-m);font-size:10px;font-weight:700;color:var(--blue);}\n.pc-body{padding:16px;}\n.pc-title{font-family:var(--ff-h);font-size:14px;font-weight:700;color:var(--text-1);margin-bottom:8px;}\n.pc-row{display:flex;gap:8px;font-size:11px;margin-bottom:4px;}\n.pc-k{font-family:var(--ff-m);font-size:10px;min-width:52px;color:var(--text-3);}\n.pc-v{font-size:12px;color:var(--text-2);}\n\n\/* \u2550\u2550 CASE STUDIES \u2550\u2550 *\/\n.case-list{display:flex;flex-direction:column;gap:28px;}\n.case-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--r4);overflow:hidden;transition:all 0.25s;}\n.case-card:hover{border-color:var(--blue);box-shadow:0 12px 40px rgba(37,99,235,0.1);}\n.case-inner{display:grid;grid-template-columns:400px 1fr;}\n@media(max-width:900px){.case-inner{grid-template-columns:1fr;}}\n.case-inner.rev{direction:rtl;}\n.case-inner.rev>*{direction:ltr;}\n.case-imgs{display:flex;flex-direction:column;}\n.ci-main{flex:1;overflow:hidden;min-height:260px;}\n.ci-main img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}\n.case-card:hover .ci-main img{transform:scale(1.04);}\n.ci-row{display:grid;grid-template-columns:1fr 1fr;border-top:3px solid #fff;}\n.ci-sm{overflow:hidden;aspect-ratio:4\/3;}\n.ci-sm img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}\n.case-card:hover .ci-sm img{transform:scale(1.06);}\n.case-body{padding:32px;display:flex;flex-direction:column;justify-content:center;}\n.case-num{font-family:var(--ff-m);font-size:10px;color:var(--text-3);letter-spacing:2px;text-transform:uppercase;margin-bottom:10px;}\n.case-title{font-family:var(--ff-h);font-size:20px;font-weight:700;color:var(--text-1);margin-bottom:14px;line-height:1.2;}\n.case-tags{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:16px;}\n.case-row{display:grid;grid-template-columns:80px 1fr;gap:8px;margin-bottom:9px;align-items:start;}\n.cr-k{font-family:var(--ff-m);font-size:10px;color:var(--text-3);letter-spacing:1px;text-transform:uppercase;padding-top:1px;}\n.cr-v{font-size:13px;color:var(--text-2);line-height:1.6;}\n.cr-v strong{color:var(--text-1);font-weight:600;}\n.case-outcome{padding:13px 15px;background:var(--blue-dim);border:1px solid rgba(37,99,235,0.18);border-radius:var(--r2);font-size:13px;color:var(--text-2);line-height:1.65;margin:14px 0 18px;}\n.case-outcome strong{color:var(--blue);}\n\n\/* \u2550\u2550 COMPARISON TABLE \u2550\u2550 *\/\n.cmp-table-wrap{overflow-x:auto;}\n.cmp-table{width:100%;border-collapse:collapse;border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;min-width:520px;}\n.cmp-table thead th{padding:11px 14px;background:var(--bg-light);font-family:var(--ff-h);font-size:11px;font-weight:700;color:var(--text-2);letter-spacing:.5px;text-transform:uppercase;text-align:left;border-bottom:1.5px solid var(--border);}\n.cmp-table thead th:nth-child(2){color:var(--blue);}\n.cmp-table thead th:nth-child(3){color:var(--blue);}\n.cmp-table thead th:nth-child(4){color:var(--blue);}\n.cmp-table thead th:nth-child(5){color:var(--text-3);}\n.cmp-table tbody td{padding:11px 14px;font-size:12px;color:var(--text-2);border-bottom:1px solid var(--border);vertical-align:top;}\n.cmp-table tbody tr:last-child td{border-bottom:none;}\n.cmp-table tbody tr:hover td{background:var(--bg-light);}\n.cmp-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\/* \u2550\u2550 PROCESS FLOW \u2550\u2550 *\/\n.flow-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){.flow-strip{grid-template-columns:1fr 1fr;}}\n.flow-step{border-right:1px solid var(--border);transition:background 0.18s;}\n.flow-step:last-child{border-right:none;}\n.flow-step:hover{background:var(--bg-light);}\n.fs-img{aspect-ratio:4\/3;overflow:hidden;}\n.fs-img img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}\n.flow-step:hover .fs-img img{transform:scale(1.07);}\n.fs-body{padding:16px;}\n.fs-num{font-family:var(--ff-m);font-size:10px;color:var(--blue);letter-spacing:2px;font-weight:700;margin-bottom:7px;}\n.fs-title{font-family:var(--ff-h);font-size:13px;font-weight:700;color:var(--text-1);margin-bottom:5px;}\n.fs-desc{font-size:11px;color:var(--text-2);line-height:1.6;}\n\n\/* \u2550\u2550 SURFACE TREATMENTS \u2550\u2550 *\/\n.sf-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}\n@media(max-width:900px){.sf-grid{grid-template-columns:1fr 1fr;}}\n.sf-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;transition:all 0.22s;}\n.sf-card:hover{border-color:var(--teal);transform:translateY(-2px);box-shadow:0 8px 24px rgba(15,118,110,0.1);}\n.sf-img{aspect-ratio:4\/3;overflow:hidden;}\n.sf-img img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}\n.sf-card:hover .sf-img img{transform:scale(1.05);}\n.sf-body{padding:16px;}\n.sf-name{font-family:var(--ff-h);font-size:14px;font-weight:700;color:var(--text-1);margin-bottom:6px;}\n.sf-desc{font-size:12px;color:var(--text-2);line-height:1.65;margin-bottom:10px;}\n.sf-tags{display:flex;flex-wrap:wrap;gap:4px;}\n.sft{padding:2px 8px;border-radius:100px;background:var(--teal-dim);border:1px solid rgba(15,118,110,0.2);font-family:var(--ff-m);font-size:10px;color:var(--teal);}\n\n\/* \u2550\u2550 WHY US \u2550\u2550 *\/\n.why-layout{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;}\n@media(max-width:800px){.why-layout{grid-template-columns:1fr;}}\n.why-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.why-img img{width:100%;height:100%;object-fit:cover;}\n.why-points{display:flex;flex-direction:column;gap:14px;}\n.wp-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.wp-item:hover{border-color:var(--blue);}\n.wp-ico{width:38px;height:38px;border-radius:10px;background:var(--blue-dim);border:1px solid rgba(37,99,235,0.15);display:flex;align-items:center;justify-content:center;font-family:var(--ff-m);font-size:12px;font-weight:700;color:var(--blue);flex-shrink:0;}\n.wp-title{font-family:var(--ff-h);font-size:14px;font-weight:700;color:var(--text-1);margin-bottom:4px;}\n.wp-desc{font-size:12px;color:var(--text-2);line-height:1.65;}\n\n\/* \u2550\u2550 INDUSTRY ROW \u2550\u2550 *\/\n.ind-row{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;}\n@media(max-width:900px){.ind-row{grid-template-columns:repeat(3,1fr);}}\n@media(max-width:480px){.ind-row{grid-template-columns:1fr 1fr;}}\n.ind-mini{padding:18px 12px;text-align:center;background:#fff;border:1.5px solid var(--border);border-radius:var(--r2);transition:all 0.2s;}\n.ind-mini:hover{border-color:var(--blue);box-shadow:0 6px 18px rgba(37,99,235,0.09);}\n.im-icon{font-size:22px;margin-bottom:8px;}\n.im-name{font-family:var(--ff-h);font-size:13px;font-weight:700;color:var(--text-1);margin-bottom:3px;}\n.im-grade{font-family:var(--ff-m);font-size:10px;color:var(--text-3);}\n\n\/* \u2550\u2550 FAQ \u2550\u2550 *\/\n.faq-layout{display:grid;grid-template-columns:1fr 2fr;gap:56px;align-items:start;}\n@media(max-width:800px){.faq-layout{grid-template-columns:1fr;}}\n.faq-list{border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;}\n.faq-item{border-bottom:1px solid var(--border);}\n.faq-item:last-child{border-bottom:none;}\n.faq-q{width:100%;padding:18px 22px;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.faq-q:hover{background:var(--bg-light);}\n.faq-q.open{color:var(--blue);background:var(--blue-dim);}\n.faq-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.faq-q.open .faq-icon{background:var(--blue);border-color:var(--blue);color:#fff;transform:rotate(45deg);}\n.faq-a{display:none;padding:0 22px 18px;font-size:14px;color:var(--text-2);line-height:1.75;}\n.faq-a.open{display:block;}\n\n\/* \u2550\u2550 METRICS \u2550\u2550 *\/\n.metrics{display:grid;grid-template-columns:repeat(4,1fr);background:var(--blue);}\n@media(max-width:640px){.metrics{grid-template-columns:1fr 1fr;}}\n.metric{padding:36px 24px;text-align:center;border-right:1px solid rgba(255,255,255,0.15);}\n.metric:last-child{border-right:none;}\n.metric-val{font-family:var(--ff-h);font-size:38px;font-weight:900;color:#fff;line-height:1;}\n.metric-unit{font-size:16px;}\n.metric-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\/* \u2550\u2550 CTA \u2550\u2550 *\/\n.cta{position:relative;padding:100px 0;overflow:hidden;}\n.cta-bg{position:absolute;inset:0;}\n.cta-bg img{width:100%;height:100%;object-fit:cover;filter:brightness(0.24);}\n.cta-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(37,99,235,0.78),rgba(15,118,110,0.52));}\n.cta-dots{position:absolute;inset:0;background-image:radial-gradient(circle,rgba(255,255,255,0.1) 1px,transparent 1px);background-size:24px 24px;}\n.cta-inner{position:relative;z-index:2;text-align:center;}\n.cta-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:16px;justify-content:center;}\n.cta-lbl::before{content:'';width:16px;height:1.5px;background:rgba(255,255,255,0.5);}\n.cta-h2{font-family:var(--ff-h);font-size:clamp(26px,3.5vw,52px);font-weight:700;color:#fff;margin-bottom:14px;line-height:1.1;}\n.cta-sub{font-size:16px;color:rgba(255,255,255,0.75);margin-bottom:36px;max-width:520px;margin-left:auto;margin-right:auto;line-height:1.75;}\n.cta-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}\n<\/style>\n\n<!-- BREADCRUMB -->\n<div class=\"breadcrumb\">\n  <div class=\"wrap\">\n    <div class=\"bc-inner\">\n      <a href=\"\/\">Home<\/a><span class=\"bc-sep\">\/<\/span>\n      <a href=\"\/material\/\">Materials<\/a><span class=\"bc-sep\">\/<\/span>\n      <a href=\"https:\/\/hxcnc.com\/stainless-steel-cnc-machining\/\">Stainless Steel<\/a><span class=\"bc-sep\">\/<\/span>\n      <span class=\"bc-current\">Martensitic Stainless \u2014 410 \/ 420 \/ 440C<\/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=\"hero\">\n  <div class=\"hero-dot\"><\/div>\n  <div class=\"wrap\">\n    <div class=\"hero-inner\">\n      <div>\n        <div class=\"label\">Martensitic Stainless Steel CNC Machining<\/div>\n        <h1 class=\"hero-h1\">Martensitic Stainless<br><span class=\"blue\">Steel Machining<\/span><\/h1>\n        <div class=\"hero-kicker\">\n          <span class=\"hk-pill\"><span class=\"hk-dot\"><\/span>410 \/ 420 \/ 440C<\/span>\n          <span class=\"hk-pill\"><span class=\"hk-dot\"><\/span>440C up to HRC 60<\/span>\n          <span class=\"hk-pill\"><span class=\"hk-dot\"><\/span>Heat Treatment Coordination<\/span>\n          <span class=\"hk-pill\"><span class=\"hk-dot\"><\/span>Precision Grinding Post-HT<\/span>\n          <span class=\"hk-pill\"><span class=\"hk-dot\"><\/span>Bearings \u00b7 Valves \u00b7 Cutlery \u00b7 Surgical<\/span>\n        <\/div>\n        <p class=\"hero-sub\">CNC machining of 410, 420, and 440C martensitic stainless steel \u2014 the only stainless family that can be hardened like tool steel. From general structural parts in 410 to HRC 60 bearing-grade 440C, with heat treatment, post-HT grinding, and full material certification.<\/p>\n        <div class=\"hero-btns\">\n          <a href=\"#quote\" class=\"btn btn-primary\">Get a Quote \u2192<\/a>\n          <a href=\"#quote\" class=\"btn btn-outline\">Send Your Drawing<\/a>\n        <\/div>\n      <\/div>\n\n      <div class=\"hero-imgs\">\n        <div class=\"hi-main\">\n          <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Martensitic-Stainless-Steel-420.jpg\" alt=\"Martensitic Stainless Steel 440C Precision Parts\">\n        <\/div>\n        <div class=\"hi-badge\">\n          <div class=\"hib-l\">Max Hardness<\/div>\n          <div class=\"hib-v\">HRC 60 (440C)<\/div>\n        <\/div>\n        <div class=\"hi-sm1\">\n          <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Martensitic-Stainless-Steel-Machining-scaled.webp\" alt=\"CNC Turning Martensitic Stainless\">\n        <\/div>\n        <div class=\"hi-sm2\">\n          <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Martensitic-Stainless-Steel.webp\" alt=\"Heat Treatment Stainless Steel\">\n        <\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"hero-bar\">\n      <div class=\"hbar-item\"><div class=\"hbar-v\">3<\/div><div class=\"hbar-l\">Grades: 410 \/ 420 \/ 440C<\/div><\/div>\n      <div class=\"hbar-item\"><div class=\"hbar-v\">HRC60<\/div><div class=\"hbar-l\">Max Hardness (440C)<\/div><\/div>\n      <div class=\"hbar-item\"><div class=\"hbar-v\">\u00b10.005<span style=\"font-size:12px\">mm<\/span><\/div><div class=\"hbar-l\">Post-HT Grinding<\/div><\/div>\n      <div class=\"hbar-item\"><div class=\"hbar-v\">24hr<\/div><div class=\"hbar-l\">Quote Turnaround<\/div><\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- TICKER -->\n<div class=\"ticker\">\n  <div class=\"tick-track\">\n    <span class=\"tick-item\">410 Martensitic Stainless <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">420 Stainless Steel <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">440C Bearing Grade <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">HRC 60 Achievable <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Heat Treatment + Grinding <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Ball Bearings &amp; Valve Seats <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Surgical Instruments <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Precision Wear Parts <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">410 Martensitic Stainless <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">420 Stainless Steel <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">440C Bearing Grade <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">HRC 60 Achievable <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Heat Treatment + Grinding <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Ball Bearings &amp; Valve Seats <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Surgical Instruments <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Precision Wear Parts <span class=\"tick-sep\">\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=\"sec sec-white\">\n  <div class=\"wrap\">\n    <div class=\"sec-head\">\n      <div>\n        <div class=\"label\">Material Grades<\/div>\n        <h2 class=\"h2\">Martensitic Stainless Steel Grades <span class=\"blue\">We Machine<\/span><\/h2>\n      <\/div>\n    <\/div>\n    <div class=\"grade-grid\">\n\n      <!-- 410 -->\n      <div class=\"grade-card\">\n        <div class=\"gc-body\">\n          <div class=\"gc-grade\">410<\/div>\n          <div class=\"gc-sub\">General-Purpose Martensitic \u00b7 11.5\u201313.5% Cr<\/div>\n          <div class=\"gc-name\">Structural Martensitic Stainless<\/div>\n          <span class=\"gc-highlight gch-blue\">Best Toughness &amp; Weldability<\/span>\n          <div class=\"gc-desc\">The most widely used martensitic stainless grade. Lowest carbon content of the three (0.08\u20130.15%) makes it the most weldable, toughest, and most corrosion resistant of the martensitic family. Heat-treatable to HRC 35\u201342. The default choice for general martensitic applications \u2014 valve bodies, pump shafts, fasteners, and structural stainless hardware requiring moderate hardness.<\/div>\n          <div class=\"gc-props\">\n            <div class=\"gc-prop\"><span class=\"gcp-dot\"><\/span>Max hardness: HRC 35\u201342 after Q&amp;T<\/div>\n            <div class=\"gc-prop\"><span class=\"gcp-dot\"><\/span>Weldability: Good (pre\/post-heat required)<\/div>\n            <div class=\"gc-prop\"><span class=\"gcp-dot\"><\/span>Corrosion resistance: Moderate<\/div>\n          <\/div>\n          <div class=\"hrc-bar-wrap\">\n            <div class=\"hrc-bar-label\"><span>Hardness Range<\/span><span>HRC 35\u201342<\/span><\/div>\n            <div class=\"hrc-bar-track\"><div class=\"hrc-bar-fill\" style=\"width:52%;\"><\/div><\/div>\n          <\/div>\n          <div class=\"gc-uses\"><span class=\"gc-use\">Valve Bodies<\/span><span class=\"gc-use\">Pump Shafts<\/span><span class=\"gc-use\">Fasteners<\/span><span class=\"gc-use\">Flanges<\/span><\/div>\n          <span class=\"gc-link\">View 410 Details<\/span>\n        <\/div>\n      <\/div>\n\n      <!-- 420 -->\n      <div class=\"grade-card\">\n        <div class=\"gc-body\">\n          <div class=\"gc-grade\">420<\/div>\n          <div class=\"gc-sub\">Cutlery Grade \u00b7 12\u201314% Cr \u00b7 Higher C<\/div>\n          <div class=\"gc-name\">Cutlery &amp; Instrument Grade Stainless<\/div>\n          <span class=\"gc-highlight gch-amber\">Best Balance of Hardness &amp; Corrosion<\/span>\n          <div class=\"gc-desc\">Higher carbon than 410 (0.15\u20130.40%) enables hardness up to HRC 50\u201352 after heat treatment \u2014 suitable for cutting edges, instrument surfaces, and wear-critical precision parts. The standard grade for stainless cutlery, surgical instruments, dental tools, and precision pivot pins. Better corrosion resistance than 440C in many environments while providing a hard, polishable surface.<\/div>\n          <div class=\"gc-props\">\n            <div class=\"gc-prop\"><span class=\"gcp-dot\"><\/span>Max hardness: HRC 50\u201352 after Q&amp;T<\/div>\n            <div class=\"gc-prop\"><span class=\"gcp-dot\"><\/span>Excellent polishability \u2014 mirror finish achievable<\/div>\n            <div class=\"gc-prop\"><span class=\"gcp-dot\"><\/span>Corrosion resistance: Good<\/div>\n          <\/div>\n          <div class=\"hrc-bar-wrap\">\n            <div class=\"hrc-bar-label\"><span>Hardness Range<\/span><span>HRC 50\u201352<\/span><\/div>\n            <div class=\"hrc-bar-track\"><div class=\"hrc-bar-fill\" style=\"width:72%;\"><\/div><\/div>\n          <\/div>\n          <div class=\"gc-uses\"><span class=\"gc-use\">Cutlery<\/span><span class=\"gc-use\">Surgical Tools<\/span><span class=\"gc-use\">Dental<\/span><span class=\"gc-use\">Pivot Pins<\/span><\/div>\n          <span class=\"gc-link\">View 420 Details<\/span>\n        <\/div>\n      <\/div>\n\n      <!-- 440C -->\n      <div class=\"grade-card\">\n        <div class=\"gc-body\">\n          <div class=\"gc-grade\">440C<\/div>\n          <div class=\"gc-sub\">Bearing Grade \u00b7 Highest C Stainless \u00b7 16\u201318% Cr<\/div>\n          <div class=\"gc-name\">Highest-Hardness Stainless Steel<\/div>\n          <span class=\"gc-highlight gch-teal\">Hardest Standard Stainless Available<\/span>\n          <div class=\"gc-desc\">The highest carbon content of any standard stainless steel (0.95\u20131.20%) gives 440C the highest achievable hardness \u2014 HRC 58\u201360 \u2014 making it functionally equivalent to a tool steel in hardness while retaining stainless corrosion resistance. The definitive grade for ball bearings, bearing races, valve balls, high-quality knife blades, and precision wear surfaces requiring both corrosion resistance and maximum hardness.<\/div>\n          <div class=\"gc-props\">\n            <div class=\"gc-prop\"><span class=\"gcp-dot\"><\/span>Max hardness: HRC 58\u201360 after Q&amp;T<\/div>\n            <div class=\"gc-prop\"><span class=\"gcp-dot\"><\/span>Corrosion resistance: Very Good (highest in martensitic family)<\/div>\n            <div class=\"gc-prop\"><span class=\"gcp-dot\"><\/span>Weldability: Not recommended (high C)<\/div>\n          <\/div>\n          <div class=\"hrc-bar-wrap\">\n            <div class=\"hrc-bar-label\"><span>Hardness Range<\/span><span>HRC 58\u201360<\/span><\/div>\n            <div class=\"hrc-bar-track\"><div class=\"hrc-bar-fill\" style=\"width:96%;\"><\/div><\/div>\n          <\/div>\n          <div class=\"gc-uses\"><span class=\"gc-use\">Ball Bearings<\/span><span class=\"gc-use\">Valve Seats<\/span><span class=\"gc-use\">Knife Blades<\/span><span class=\"gc-use\">Wear Surfaces<\/span><\/div>\n          <span class=\"gc-link\">View 440C Details<\/span>\n        <\/div>\n      <\/div>\n\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. HARDNESS 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=\"sec sec-light\">\n  <div class=\"wrap\">\n    <div class=\"sec-head\">\n      <div>\n        <div class=\"label\">Grade Selection<\/div>\n        <h2 class=\"h2\">Comparing 410, 420, and 440C \u2014 <span class=\"blue\">Which Grade Fits Your Part?<\/span><\/h2>\n      <\/div>\n    <\/div>\n\n    <!-- visual hardness scale -->\n    <div class=\"hrc-compare\" style=\"margin-bottom:40px;\">\n      <div class=\"hrc-img\">\n        <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Martensitic-Stainless-Steel.jpg\" alt=\"Martensitic Stainless Hardness Comparison\">\n      <\/div>\n      <div>\n        <p style=\"font-size:14px;color:var(--text-2);line-height:1.75;margin-bottom:24px;\">Carbon content is the primary differentiator \u2014 more carbon means harder but less weldable and slightly more susceptible to corrosion. Choose the minimum hardness grade that satisfies your application requirement.<\/p>\n        <div class=\"hrc-scale\">\n          <div class=\"hrc-row\">\n            <div class=\"hrc-grade\">410<\/div>\n            <div class=\"hrc-bar-outer\"><div class=\"hrc-bar-inner hrc-bar-410\"><div class=\"hrc-val\">HRC 35\u201342<\/div><\/div><\/div>\n            <div class=\"hrc-note\">General Structural<\/div>\n          <\/div>\n          <div class=\"hrc-row\">\n            <div class=\"hrc-grade\">420<\/div>\n            <div class=\"hrc-bar-outer\"><div class=\"hrc-bar-inner hrc-bar-420\"><div class=\"hrc-val\">HRC 50\u201352<\/div><\/div><\/div>\n            <div class=\"hrc-note\">Cutlery \/ Surgical<\/div>\n          <\/div>\n          <div class=\"hrc-row\">\n            <div class=\"hrc-grade\">440C<\/div>\n            <div class=\"hrc-bar-outer\"><div class=\"hrc-bar-inner hrc-bar-440c\"><div class=\"hrc-val\">HRC 58\u201360<\/div><\/div><\/div>\n            <div class=\"hrc-note\">Bearings \/ Wear<\/div>\n          <\/div>\n        <\/div>\n        <div class=\"hrc-ref\">\n          <div class=\"hrc-ref-item\"><div class=\"hrc-ref-dot\" style=\"background:#3B82F6;\"><\/div>Reference: 4140 alloy steel \u2014 HRC 28\u201334 (Q&amp;T)<\/div>\n          <div class=\"hrc-ref-item\"><div class=\"hrc-ref-dot\" style=\"background:#0F766E;\"><\/div>Reference: D2 Tool Steel \u2014 HRC 58\u201362<\/div>\n        <\/div>\n        <div style=\"margin-top:16px;padding:13px 15px;background:var(--bg-light);border:1px solid var(--border);border-radius:var(--r2);font-size:12px;color:var(--text-2);line-height:1.65;\">\n          <strong style=\"color:var(--blue);\">Selection rule:<\/strong> Specify 410 unless hardness &gt;HRC 42 is needed. Move to 420 for cutlery\/instrument applications. Specify 440C only when maximum hardness is required \u2014 it is the most expensive to machine and heat treat of the three.\n        <\/div>\n      <\/div>\n    <\/div>\n\n    <!-- Comparison table -->\n    <div class=\"cmp-table-wrap\">\n      <table class=\"cmp-table\">\n        <thead>\n          <tr>\n            <th>Property<\/th>\n            <th>410<\/th>\n            <th>420<\/th>\n            <th>440C<\/th>\n            <th>304 (reference)<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td>Carbon %<\/td>\n            <td>0.08\u20130.15%<\/td>\n            <td>0.15\u20130.40%<\/td>\n            <td>0.95\u20131.20%<\/td>\n            <td>0.08% max<\/td>\n          <\/tr>\n          <tr>\n            <td>Chromium %<\/td>\n            <td>11.5\u201313.5%<\/td>\n            <td>12\u201314%<\/td>\n            <td>16\u201318%<\/td>\n            <td>18\u201320%<\/td>\n          <\/tr>\n          <tr>\n            <td>Max Hardness (HT)<\/td>\n            <td>HRC 35\u201342<\/td>\n            <td>HRC 50\u201352<\/td>\n            <td><span class=\"badge-ok\">HRC 58\u201360<\/span><\/td>\n            <td><span class=\"badge-no\">Non-hardenable<\/span><\/td>\n          <\/tr>\n          <tr>\n            <td>Corrosion Resistance<\/td>\n            <td>Moderate<\/td>\n            <td>Good<\/td>\n            <td>Very Good (for martensitic)<\/td>\n            <td><span class=\"badge-ok\">Excellent<\/span><\/td>\n          <\/tr>\n          <tr>\n            <td>Weldability<\/td>\n            <td><span class=\"badge-warn\">Limited (pre-heat)<\/span><\/td>\n            <td><span class=\"badge-warn\">Difficult<\/span><\/td>\n            <td><span class=\"badge-no\">Not Recommended<\/span><\/td>\n            <td><span class=\"badge-ok\">Excellent<\/span><\/td>\n          <\/tr>\n          <tr>\n            <td>Magnetic<\/td>\n            <td>Yes \u2713<\/td>\n            <td>Yes \u2713<\/td>\n            <td>Yes \u2713<\/td>\n            <td>No (annealed)<\/td>\n          <\/tr>\n          <tr>\n            <td>Machinability<\/td>\n            <td><span class=\"star-blue\">\u2605\u2605\u2605\u2605<\/span> Good<\/td>\n            <td><span class=\"star-blue\">\u2605\u2605\u2605<\/span> Moderate<\/td>\n            <td><span class=\"star-blue\">\u2605\u2605\u2605<\/span> Moderate<\/td>\n            <td><span class=\"star-blue\">\u2605\u2605\u2605<\/span> Moderate<\/td>\n          <\/tr>\n          <tr>\n            <td>Typical Parts<\/td>\n            <td>Valves, shafts, flanges, fasteners<\/td>\n            <td>Cutlery, surgical instruments, dental tools<\/td>\n            <td>Bearings, valve balls, knife blades, wear parts<\/td>\n            <td>General corrosion-resistant parts<\/td>\n          <\/tr>\n          <tr>\n            <td>EN Equivalent<\/td>\n            <td>1.4006<\/td>\n            <td>1.4021 \/ 1.4028<\/td>\n            <td>1.4125<\/td>\n            <td>1.4301<\/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     HEAT TREATMENT WORKFLOW\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=\"sec sec-white\">\n  <div class=\"wrap\">\n    <div style=\"text-align:center;margin-bottom:40px;\">\n      <div class=\"label\" style=\"justify-content:center;\">Heat Treatment Process<\/div>\n      <h2 class=\"h2\">From Annealed to <span class=\"blue\">Final Hardness \u2014 Our Managed Process<\/span><\/h2>\n      <p style=\"font-size:14px;color:var(--text-2);max-width:640px;margin:14px auto 0;line-height:1.75;\">Martensitic stainless parts are machined soft, heat-treated, then precision-ground on critical surfaces. We coordinate all three stages as a single managed order \u2014 no inter-supplier coordination required from the customer.<\/p>\n    <\/div>\n    <div class=\"ht-flow\">\n      <div class=\"ht-step\">\n        <div class=\"ht-ico\">\ud83d\udd29<\/div>\n        <div class=\"ht-title\">Rough Machine<\/div>\n        <div class=\"ht-temp\">Annealed Condition<\/div>\n        <div class=\"ht-desc\">OD, ID, faces, and features machined with grinding allowance left on critical surfaces. Annealed stainless machines cleanly at this stage.<\/div>\n      <\/div>\n      <div class=\"ht-step\">\n        <div class=\"ht-ico\">\ud83d\udd25<\/div>\n        <div class=\"ht-title\">Austenitize<\/div>\n        <div class=\"ht-temp\">980\u20131065\u00b0C<\/div>\n        <div class=\"ht-desc\">Part heated to austenitizing temperature \u2014 980\u00b0C (410\/420) or 1010\u20131065\u00b0C (440C) \u2014 held to dissolve carbides into austenite matrix.<\/div>\n      <\/div>\n      <div class=\"ht-step\">\n        <div class=\"ht-ico\">\u2744<\/div>\n        <div class=\"ht-title\">Quench<\/div>\n        <div class=\"ht-temp\">Air or Oil Quench<\/div>\n        <div class=\"ht-desc\">Rapid cooling transforms austenite to martensite \u2014 creating the high-hardness structure. Distortion controlled through fixture and orientation design.<\/div>\n      <\/div>\n      <div class=\"ht-step\">\n        <div class=\"ht-ico\">\ud83c\udf21<\/div>\n        <div class=\"ht-title\">Temper<\/div>\n        <div class=\"ht-temp\">150\u2013370\u00b0C<\/div>\n        <div class=\"ht-desc\">Controlled tempering relieves brittleness while maintaining target hardness. Final HRC verified by hardness test on part or representative coupon.<\/div>\n      <\/div>\n      <div class=\"ht-step\">\n        <div class=\"ht-ico\">\u2699<\/div>\n        <div class=\"ht-title\">Precision Grind<\/div>\n        <div class=\"ht-temp\">\u00b10.005 mm<\/div>\n        <div class=\"ht-desc\">Post-HT OD\/ID grinding recovers final tolerance on critical surfaces after heat treatment distortion. CMM verification of final dimensions before shipment.<\/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     MACHINING CONSIDERATIONS\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=\"sec sec-light\">\n  <div class=\"wrap\">\n    <div class=\"sec-head\">\n      <div>\n        <div class=\"label\">Machining Notes<\/div>\n        <h2 class=\"h2\">Machining Martensitic Stainless \u2014 <span class=\"blue\">Key Considerations<\/span><\/h2>\n      <\/div>\n    <\/div>\n    <div class=\"mach-consider\">\n      <div class=\"mc-box\">\n        <div class=\"mc-box-head\"><div class=\"mc-box-ico mc-box-ico-red\">\u26a0<\/div>Challenges with Martensitic Grades<\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-red\">!<\/span><div><strong>Work-hardening \u2014 less than austenitic, but present<\/strong>Martensitic grades work-harden less aggressively than 304\/316, but still require sharp tooling and consistent feeds to prevent surface hardening and edge build-up.<\/div><\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-red\">!<\/span><div><strong>440C is abrasive \u2014 high carbide content<\/strong>The high carbon \/ chromium carbide content of 440C is significantly more abrasive than 410 or 420. Carbide inserts wear faster \u2014 planned tool change intervals are essential for consistent results in production.<\/div><\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-red\">!<\/span><div><strong>Post-HT machining requires grinding, not turning<\/strong>Once hardened to HRC 55+, 440C and 420 cannot be conventionally turned \u2014 only CBN grinding or EDM are practical. Part design must leave appropriate grinding stock.<\/div><\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-red\">!<\/span><div><strong>Heat treatment distortion must be anticipated<\/strong>All three grades distort during quench \u2014 critical diameters and faces must be planned with sufficient grinding allowance to recover tolerance after heat treatment.<\/div><\/div>\n      <\/div>\n      <div class=\"mc-box\">\n        <div class=\"mc-box-head\"><div class=\"mc-box-ico mc-box-ico-blue\">\u2713<\/div>How We Manage These Challenges<\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-blue\">\u2713<\/span><div><strong>Machine soft, grind hard \u2014 planned sequence<\/strong>All martensitic parts are rough-machined in annealed condition with grinding stock, heat-treated, then precision-ground to final tolerance. This is our standard workflow, not an exception.<\/div><\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-blue\">\u2713<\/span><div><strong>Grade-specific tooling and insert selection<\/strong>440C requires tougher carbide grades (PVD-coated, positive rake). We maintain separate tooling strategies per grade to optimize tool life and surface finish per batch.<\/div><\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-blue\">\u2713<\/span><div><strong>Distortion mapped from experience, not guesswork<\/strong>Known distortion patterns for 440C and 420 after quench are incorporated into the grinding allowance \u2014 we do not leave this to the customer to discover during first article.<\/div><\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-blue\">\u2713<\/span><div><strong>Single-source heat treatment coordination<\/strong>We manage austenitizing, quench, and tempering as part of the order \u2014 hardness verified by test coupon or part surface measurement before releasing to grinding.<\/div><\/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     4. CAPABILITIES\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=\"sec sec-white\">\n  <div class=\"wrap\">\n    <div class=\"sec-head\">\n      <div>\n        <div class=\"label\">Manufacturing Capability<\/div>\n        <h2 class=\"h2\">How We Machine <span class=\"blue\">Martensitic Stainless Steel<\/span><\/h2>\n      <\/div>\n    <\/div>\n    <div class=\"cap-grid\">\n\n      <div class=\"cap-card\">\n        <div class=\"cc-img\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/CNC-Turning-Service.webp\" alt=\"CNC Turning 410 420 Stainless Steel\"><\/div>\n        <div class=\"cc-body\">\n          <div class=\"cc-num\">PROCESS \/ 01<\/div>\n          <div class=\"cc-title\">CNC Turning (Annealed)<\/div>\n          <div class=\"cc-desc\">Rough and semi-finish turning of 410, 420, and 440C in annealed or normalized condition. External profiles, OD steps, threads, grooves, and bores machined with designed-in grinding allowance on critical surfaces before heat treatment.<\/div>\n          <div class=\"cc-tags\"><span class=\"cct\">Annealed Condition<\/span><span class=\"cct\">Grinding Allowance<\/span><span class=\"cct\">All 3 Grades<\/span><\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"cap-card\">\n        <div class=\"cc-img\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Custom-CNC-Milling.jpg\" alt=\"CNC Milling 410 420 Stainless Steel\"><\/div>\n        <div class=\"cc-body\">\n          <div class=\"cc-num\">PROCESS \/ 02<\/div>\n          <div class=\"cc-title\">CNC Milling (Annealed &amp; Pre-Hardened)<\/div>\n          <div class=\"cc-desc\">3-axis and 4-axis milling of 410 and 420 valve bodies, housings, flanges, and structural parts. 410 in pre-hardened (HRC 25\u201332) condition can be directly milled using optimized carbide tooling for some applications.<\/div>\n          <div class=\"cc-tags\"><span class=\"cct\">Valve Bodies<\/span><span class=\"cct\">Housings<\/span><span class=\"cct\">Flanges<\/span><span class=\"cct\">Pre-Hardened 410<\/span><\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"cap-card\">\n        <div class=\"cc-img\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Rapid-Prototyping-scaled.webp\" alt=\"Prototype to Production Martensitic Stainless\"><\/div>\n        <div class=\"cc-body\">\n          <div class=\"cc-num\">PROCESS \/ 03<\/div>\n          <div class=\"cc-title\">Prototype to Production<\/div>\n          <div class=\"cc-desc\">1-piece prototypes through to production quantities of thousands of martensitic stainless parts. The full machine \u2192 heat treat \u2192 grind \u2192 inspect sequence runs for all quantities with no minimum order.<\/div>\n          <div class=\"cc-tags\"><span class=\"cct\">No MOQ<\/span><span class=\"cct\">Full Sequence<\/span><span class=\"cct\">Same QC<\/span><\/div>\n        <\/div>\n      <\/div>\n\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     5. 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=\"sec sec-light\">\n  <div class=\"wrap\">\n    <div class=\"sec-head\">\n      <div>\n        <div class=\"label\">Application Gallery<\/div>\n        <h2 class=\"h2\">Typical Martensitic Stainless Parts <span class=\"blue\">We Produce<\/span><\/h2>\n      <\/div>\n    <\/div>\n    <div class=\"parts-grid\">\n\n      <div class=\"part-card\">\n        <div class=\"pc-body\">\n          <div class=\"pc-title\">Precision Bearings &amp; Races<\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Material<\/span><span class=\"pc-v\">440C \u2014 HRC 58\u201360 after Q&amp;T<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Process<\/span><span class=\"pc-v\">Turning \u2192 Q&amp;T \u2192 OD\/ID Grinding<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Industry<\/span><span class=\"pc-v\">Aerospace \u00b7 Marine \u00b7 Food Machinery<\/span><\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"part-card\">\n        <div class=\"pc-body\">\n          <div class=\"pc-title\">Surgical &amp; Dental Instruments<\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Material<\/span><span class=\"pc-v\">420 \u2014 HRC 50\u201352, polishable<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Process<\/span><span class=\"pc-v\">CNC Turning \u2192 Q&amp;T \u2192 Mirror Polish<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Industry<\/span><span class=\"pc-v\">Medical \u00b7 Dental \u00b7 Surgical<\/span><\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"part-card\">\n        <div class=\"pc-body\">\n          <div class=\"pc-title\">Valve Bodies &amp; Pump Shafts<\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Material<\/span><span class=\"pc-v\">410 \u2014 HRC 35\u201342 after Q&amp;T<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Process<\/span><span class=\"pc-v\">CNC Turning \u00b7 Milling \u00b7 Q&amp;T<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Industry<\/span><span class=\"pc-v\">Oil &amp; Gas \u00b7 Chemical \u00b7 Industrial<\/span><\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"part-card\">\n        <div class=\"pc-body\">\n          <div class=\"pc-title\">Valve Balls &amp; Seats<\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Material<\/span><span class=\"pc-v\">440C \u2014 Corrosion + Wear Resistant<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Process<\/span><span class=\"pc-v\">CNC Turning \u2192 Q&amp;T \u2192 Lapping<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Industry<\/span><span class=\"pc-v\">Fluid Control \u00b7 Oil &amp; Gas \u00b7 Marine<\/span><\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"part-card\">\n        <div class=\"pc-body\">\n          <div class=\"pc-title\">Precision Pivot Pins &amp; Shafts<\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Material<\/span><span class=\"pc-v\">420 (std) \/ 440C (max wear)<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Process<\/span><span class=\"pc-v\">Swiss Turning \u2192 Q&amp;T \u2192 Grinding<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Industry<\/span><span class=\"pc-v\">Optical \u00b7 Instruments \u00b7 Precision Mech.<\/span><\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"part-card\">\n        <div class=\"pc-body\">\n          <div class=\"pc-title\">Fasteners &amp; Structural Hardware<\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Material<\/span><span class=\"pc-v\">410 \u2014 Best weldability, moderate HRC<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Process<\/span><span class=\"pc-v\">CNC Turning \u00b7 Threading \u00b7 Q&amp;T<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Industry<\/span><span class=\"pc-v\">Marine \u00b7 Petrochemical \u00b7 Construction<\/span><\/div>\n        <\/div>\n      <\/div>\n\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     6. 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=\"sec sec-white\">\n  <div class=\"wrap\">\n    <div style=\"text-align:center;margin-bottom:40px;\">\n      <div class=\"label\" style=\"justify-content:center;\">Industries Served<\/div>\n      <h2 class=\"h2\">Martensitic Stainless for <span class=\"blue\">Demanding Applications<\/span><\/h2>\n    <\/div>\n    <div class=\"ind-row\">\n      <div class=\"ind-mini\"><div class=\"im-icon\">\u2695<\/div><div class=\"im-name\">Medical \/ Dental<\/div><div class=\"im-grade\">420<\/div><\/div>\n      <div class=\"ind-mini\"><div class=\"im-icon\">\u2699<\/div><div class=\"im-name\">Bearings<\/div><div class=\"im-grade\">440C<\/div><\/div>\n      <div class=\"ind-mini\"><div class=\"im-icon\">\ud83d\udd27<\/div><div class=\"im-name\">Valves \/ Pumps<\/div><div class=\"im-grade\">410 \/ 440C<\/div><\/div>\n      <div class=\"ind-mini\"><div class=\"im-icon\">\u2708<\/div><div class=\"im-name\">Aerospace<\/div><div class=\"im-grade\">440C \/ 410<\/div><\/div>\n      <div class=\"ind-mini\"><div class=\"im-icon\">\u2693<\/div><div class=\"im-name\">Marine<\/div><div class=\"im-grade\">410 \/ 440C<\/div><\/div>\n      <div class=\"ind-mini\"><div class=\"im-icon\">\u25c8<\/div><div class=\"im-name\">Oil &amp; Gas<\/div><div class=\"im-grade\">410 \/ 420<\/div><\/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     8. 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=\"sec sec-white\">\n  <div class=\"wrap\">\n    <div style=\"text-align:center;margin-bottom:48px;\">\n      <div class=\"label\" style=\"justify-content:center;\">From Bar Stock to Hardened, Ground Part<\/div>\n      <h2 class=\"h2\">How We Produce <span class=\"blue\">Martensitic Stainless Parts<\/span><\/h2>\n    <\/div>\n    <div class=\"flow-strip\">\n      <div class=\"flow-step\">\n        <div class=\"fs-body\">\n          <div class=\"fs-num\">STEP 01<\/div>\n          <div class=\"fs-title\">Raw Material<\/div>\n          <div class=\"fs-desc\">410 \/ 420 \/ 440C annealed bar or billet with ASTM A276 \/ A484 mill cert \u2014 heat number, chemistry, and mechanical properties verified on receipt.<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"flow-step\">\n        <div class=\"fs-body\">\n          <div class=\"fs-num\">STEP 02<\/div>\n          <div class=\"fs-title\">Rough Machining<\/div>\n          <div class=\"fs-desc\">CNC turning, milling, and boring in annealed condition. Grinding stock (0.2\u20130.5 mm per side) left on all critical surfaces before heat treatment.<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"flow-step\">\n        <div class=\"fs-body\">\n          <div class=\"fs-num\">STEP 03<\/div>\n          <div class=\"fs-title\">Heat Treatment<\/div>\n          <div class=\"fs-desc\">Austenitize \u2192 quench \u2192 temper (+ sub-zero for 440C if specified). Hardness verified on test coupon or part surface before proceeding.<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"flow-step\">\n        <div class=\"fs-body\">\n          <div class=\"fs-num\">STEP 04<\/div>\n          <div class=\"fs-title\">Precision Grinding<\/div>\n          <div class=\"fs-desc\">OD, ID, and surface grinding recovers final tolerance (\u00b10.005 mm) after heat treatment distortion. Concentricity and roundness verified.<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"flow-step\">\n        <div class=\"fs-body\">\n          <div class=\"fs-num\">STEP 05<\/div>\n          <div class=\"fs-title\">Inspection &amp; Delivery<\/div>\n          <div class=\"fs-desc\">CMM dimensional report, hardness test record, material cert, and surface finish verification packed with every order. Worldwide delivery.<\/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     9. 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=\"sec sec-light\">\n  <div class=\"wrap\">\n    <div class=\"sec-head\">\n      <div>\n        <div class=\"label\">Post-Processing<\/div>\n        <h2 class=\"h2\">Surface Treatments for <span class=\"teal\">Martensitic Stainless Parts<\/span><\/h2>\n      <\/div>\n      <a href=\"\/surface-treatment\/\" class=\"btn btn-ghost btn-sm\">All Finishes \u2192<\/a>\n    <\/div>\n    <div class=\"sf-grid\">\n      <div class=\"sf-card\">\n        <div class=\"sf-body\">\n          <div class=\"sf-name\">Passivation<\/div>\n          <div class=\"sf-desc\">Citric or nitric acid passivation (ASTM A967) removes free iron and strengthens the chromium oxide layer. Less effective on martensitic grades than austenitic due to lower Cr content, but provides a measurable improvement in atmospheric corrosion resistance.<\/div>\n          <div class=\"sf-tags\"><span class=\"sft\">ASTM A967<\/span><span class=\"sft\">410 \/ 420<\/span><span class=\"sft\">Light Corrosion Protect<\/span><\/div>\n        <\/div>\n      <\/div>\n      <div class=\"sf-card\">\n        <div class=\"sf-body\">\n          <div class=\"sf-name\">Black Oxide<\/div>\n          <div class=\"sf-desc\">Hot caustic blackening provides a matte black finish with minimal dimensional change (&lt;0.001 mm). Common on 410 and 420 valve components, tool bodies, and precision instrument parts requiring a non-reflective appearance with light rust protection.<\/div>\n          <div class=\"sf-tags\"><span class=\"sft\">~0 Dim. Change<\/span><span class=\"sft\">Matte Black<\/span><span class=\"sft\">410 \/ 420<\/span><\/div>\n        <\/div>\n      <\/div>\n      <div class=\"sf-card\">\n        <div class=\"sf-body\">\n          <div class=\"sf-name\">Mechanical &amp; Mirror Polishing<\/div>\n          <div class=\"sf-desc\">420 and 440C accept excellent polished finishes due to their fine carbide structure \u2014 Ra 0.1 \u03bcm mirror finish achievable. Standard for surgical instruments, dental tools, and cutlery where both hardness and surface finish quality are required.<\/div>\n          <div class=\"sf-tags\"><span class=\"sft\">Ra 0.1 \u03bcm<\/span><span class=\"sft\">420 \/ 440C<\/span><span class=\"sft\">Surgical Grade<\/span><\/div>\n        <\/div>\n      <\/div>\n      <div class=\"sf-card\">\n        <div class=\"sf-body\">\n          <div class=\"sf-name\">PVD Coating (TiN \/ CrN)<\/div>\n          <div class=\"sf-desc\">Physical vapor deposition of TiN or CrN wear coatings on 440C parts. Applied after hardening and grinding \u2014 adds Hv 2200+ surface hardness and reduces friction coefficient, extending service life on wear surfaces, valve seats, and precision dies.<\/div>\n          <div class=\"sf-tags\"><span class=\"sft\">440C<\/span><span class=\"sft\">TiN \/ CrN<\/span><span class=\"sft\">Wear Enhancement<\/span><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- METRICS -->\n<div class=\"metrics\">\n  <div class=\"metric\"><div class=\"metric-val\">HRC60<\/div><div class=\"metric-lbl\">Max Hardness (440C)<\/div><\/div>\n  <div class=\"metric\"><div class=\"metric-val\">\u00b10.005<span class=\"metric-unit\">mm<\/span><\/div><div class=\"metric-lbl\">Post-HT Grinding<\/div><\/div>\n  <div class=\"metric\"><div class=\"metric-val\">Ra 0.1<span class=\"metric-unit\">\u03bcm<\/span><\/div><div class=\"metric-lbl\">Mirror Polish (420\/440C)<\/div><\/div>\n  <div class=\"metric\"><div class=\"metric-val\">24<span class=\"metric-unit\">hr<\/span><\/div><div class=\"metric-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     10. WHY CHOOSE 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=\"sec sec-white\">\n  <div class=\"wrap\">\n    <div class=\"why-layout\">\n      <div class=\"why-img\">\n        <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Technical-Specifications.jpg\" alt=\"Precision Grinding Stainless Steel Workshop\">\n      <\/div>\n      <div>\n        <div class=\"label\">Why Work With Us<\/div>\n        <h2 class=\"h2\" style=\"margin-bottom:24px;\">Why Choose Us for <span class=\"blue\">Martensitic Stainless Machining<\/span><\/h2>\n        <div class=\"why-points\">\n          <div class=\"wp-item\">\n            <div class=\"wp-ico\">HT<\/div>\n            <div>\n              <div class=\"wp-title\">Heat Treatment Managed as Part of the Order<\/div>\n              <div class=\"wp-desc\">Austenitizing, quench, temper, and sub-zero treatment (for 440C) coordinated and managed by us \u2014 not outsourced for the customer to manage separately. One order, one hardness-verified delivery.<\/div>\n            <\/div>\n          <\/div>\n          <div class=\"wp-item\">\n            <div class=\"wp-ico\">GR<\/div>\n            <div>\n              <div class=\"wp-title\">Post-HT Precision Grinding to \u00b10.005 mm<\/div>\n              <div class=\"wp-desc\">Critical diameters, bearing seats, and bore fits precision-ground after heat treatment. Concentricity and runout verified by CMM. Tolerances held consistently across batches \u2014 not just on first article.<\/div>\n            <\/div>\n          <\/div>\n          <div class=\"wp-item\">\n            <div class=\"wp-ico\">SZ<\/div>\n            <div>\n              <div class=\"wp-title\">Sub-Zero Treatment for 440C \u2014 Included When Specified<\/div>\n              <div class=\"wp-desc\">Sub-zero treatment (\u221275\u00b0C to \u2212196\u00b0C) converts retained austenite in 440C to martensite, maximizing hardness and dimensional stability. We include this in the heat treatment sequence when the application demands it.<\/div>\n            <\/div>\n          <\/div>\n          <div class=\"wp-item\">\n            <div class=\"wp-ico\">QC<\/div>\n            <div>\n              <div class=\"wp-title\">Hardness Testing + CMM Reports + Material Certs<\/div>\n              <div class=\"wp-desc\">Rockwell hardness test records, CMM dimensional reports, and ASTM\/EN mill certificates with every order. No hunting for documentation after delivery \u2014 everything ships with the parts.<\/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=\"sec sec-light\">\n  <div class=\"wrap\">\n    <div class=\"faq-layout\">\n      <div>\n        <div class=\"label\">FAQ<\/div>\n        <h2 class=\"h2\">Frequently Asked <span class=\"blue\">Questions<\/span><\/h2>\n        <p style=\"font-size:14px;color:var(--text-2);line-height:1.75;margin-top:16px;\">Common questions about 410, 420, and 440C martensitic stainless steel \u2014 hardness, heat treatment, machining, and surface finishing.<\/p>\n        <div style=\"margin-top:28px;display:flex;flex-direction:column;gap:10px;\">\n          <a href=\"#quote\" class=\"btn btn-primary btn-sm\">Talk to an Engineer<\/a>\n          <a href=\"\/material\/stainless-steel\/\" class=\"btn btn-outline btn-sm\">\u2190 All Stainless Grades<\/a>\n          <a href=\"\/material\/stainless-steel\/austenitic\/\" class=\"btn btn-outline btn-sm\">Austenitic SS \u2192<\/a>\n        <\/div>\n      <\/div>\n\n      <div class=\"faq-list\" itemscope itemtype=\"https:\/\/schema.org\/FAQPage\">\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">What is martensitic stainless steel and how does it differ from austenitic stainless?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Martensitic stainless steels are a family of chromium-alloyed steels that can be hardened by heat treatment \u2014 quenching and tempering \u2014 to achieve high hardness values up to HRC 60. Unlike austenitic grades (304, 316) which are non-hardenable and prized for corrosion resistance, martensitic grades trade some corrosion resistance for the ability to achieve high hardness, wear resistance, and edge retention. They are the only stainless steel family that can be through-hardened like tool steel, making them suitable for knives, bearings, valve components, and wear-critical precision parts.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">What is the difference between 410, 420, and 440C stainless steel?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">The three grades differ primarily in carbon content, which determines maximum achievable hardness and wear resistance. 410 has the lowest carbon (0.08\u20130.15%), making it the most weldable and toughest \u2014 used for valve bodies, pump shafts, and structural parts where moderate hardness suffices. 420 has higher carbon (0.15\u20130.40%) enabling hardness to HRC 50\u201352, with better wear resistance \u2014 common for cutlery, surgical instruments, and dental tools. 440C has the highest carbon (0.95\u20131.20%) of any standard stainless steel, achieving HRC 58\u201360 after heat treatment \u2014 the hardest stainless available, used for ball bearings, high-quality knives, valve seats, and precision wear surfaces.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">Can martensitic stainless steel be welded?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Martensitic stainless steels can be welded but require pre-heat and post-weld heat treatment to avoid cold cracking and hardened heat-affected zones. 410 has the best weldability of the three grades. 420 requires more care. 440C is generally considered difficult to weld and is rarely specified for welded assemblies \u2014 its high carbon content makes HAZ cracking a significant risk. If your part requires welding and stainless properties, consider austenitic 304L or 316L instead.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">What is the maximum hardness achievable for 410, 420, and 440C?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">After quench and temper heat treatment: 410 achieves HRC 35\u201342 depending on tempering temperature. 420 achieves HRC 50\u201352. 440C achieves HRC 58\u201360 \u2014 the highest hardness of any standard stainless steel grade. These hardness values are achievable after proper austenitizing, quenching, and tempering. We coordinate heat treatment as part of the machining order, with hardness testing verification provided.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">How should martensitic stainless steel be machined \u2014 before or after heat treatment?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Parts are typically rough-machined in the annealed or pre-hardened condition, heat-treated to final hardness, then finish-ground or precision-turned on critical surfaces to recover final tolerance after heat treatment distortion. Machining in the hardened condition (particularly 440C at HRC 58\u201360) requires CBN tooling or grinding and is significantly more expensive. Our standard sequence is: rough machine \u2192 heat treat \u2192 finish grind critical dimensions \u2192 CMM verification. This sequence is coordinated and managed by us as a single-source process.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">What surface treatments are suitable for martensitic stainless steel?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Unlike austenitic grades, martensitic stainless steel cannot be passivated as effectively due to lower chromium content and the presence of carbides. Common surface treatments include: passivation (improves corrosion resistance modestly \u2014 ASTM A967), black oxide (light protection, minimal dimensional change), PVD coating (for 440C cutting tools and wear surfaces \u2014 adds TiN or CrN wear layer), and polishing or superfinishing (for bearing surfaces and sealing faces). Hard chrome plating is also used on 410 valve stems and pump shafts.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">What is 440C stainless steel used for in CNC machining?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">440C is primarily used in applications requiring the highest achievable hardness in a stainless steel combined with moderate corrosion resistance. CNC machining applications include: precision ball bearings and bearing races, high-quality knife blades and cutting tools, valve seats and valve balls requiring corrosion resistance plus wear resistance, pump impeller wear rings, precision dies and forming tools, dental and surgical instruments requiring edge retention, and nozzle seats in fluid control systems.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">Is martensitic stainless steel magnetic?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Yes. Unlike austenitic stainless steels (304, 316) which are non-magnetic in the annealed condition, martensitic stainless steels (410, 420, 440C) are ferromagnetic \u2014 strongly magnetic in both the annealed and hardened condition. This is due to their body-centered cubic (BCC) or body-centered tetragonal (BCT in hardened state) crystal structure. If non-magnetic properties are required for your application, specify an austenitic grade instead.<\/div>\n          <\/div>\n        <\/div>\n\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<script>\nfunction faq(btn){\n  var open=btn.classList.contains('open');\n  document.querySelectorAll('.faq-q').forEach(function(b){b.classList.remove('open');var a=b.nextElementSibling;if(a)a.classList.remove('open');});\n  if(!open){btn.classList.add('open');var a=btn.nextElementSibling;if(a)a.classList.add('open');}\n}\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-61b02eb3 e-con-full quote e-flex e-con e-parent\" data-id=\"61b02eb3\" data-element_type=\"container\" data-e-type=\"container\" id=\"quote\">\n\t\t<div class=\"elementor-element elementor-element-49bb7f40 e-con-full e-flex e-con e-child\" data-id=\"49bb7f40\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-512a3dc0 elementor-widget elementor-widget-html\" data-id=\"512a3dc0\" 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  --fh:'Roboto Condensed',sans-serif;--fb:'Roboto',sans-serif;--fm:'Roboto 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display:flex;align-items:center;justify-content:center;font-size:15px;\n  transition:background .18s;\n}\n.HXCL .avitem:hover .ico{background:var(--acB);}\n.HXCL .avitem .at{\n  font-family:var(--fh);font-size:14px;font-weight:700;\n  color:var(--tx);margin-bottom:2px;line-height:1.2;\n}\n.HXCL .avitem .ad{\n  font-size:12px;color:var(--tx1);line-height:1.62;\n}\n\n\/* \u2500\u2500 CERT TAGS \u2500\u2500 *\/\n.HXCL .certs{\n  display:flex;flex-wrap:wrap;gap:7px;\n  padding-top:20px;border-top:1.5px solid var(--bd);\n}\n.HXCL .cert{\n  padding:4px 11px;border-radius:100px;\n  background:var(--lt);border:1px solid var(--bd);\n  font-family:var(--fm);font-size:10px;color:var(--tx2);letter-spacing:.8px;\n}\n.HXCL .cert.hi{\n  background:var(--acA);border-color:var(--acC);\n  color:var(--ac);font-weight:700;\n}\n<\/style>\n\n<div class=\"HXCL\">\n<div class=\"panel\">\n\n  <div class=\"eyebrow\">Get a Quote<\/div>\n\n  <h2 class=\"headline\">\n    Send Your Drawing.<br><em>Get a 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-1ccf06a e-con-full e-flex e-con e-child\" data-id=\"1ccf06a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5b297805 elementor-button-align-stretch elementor-widget elementor-widget-form\" data-id=\"5b297805\" data-element_type=\"widget\" data-e-type=\"widget\" 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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 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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 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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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viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256C504 119 393 8 256 8S8 119 8 256s111 248 248 248 248-111 248-248zm-448 0c0-110.5 89.5-200 200-200s200 89.5 200 200-89.5 200-200 200S56 366.5 56 256zm72 20v-40c0-6.6 5.4-12 12-12h116v-67c0-10.7 12.9-16 20.5-8.5l99 99c4.7 4.7 4.7 12.3 0 17l-99 99c-7.6 7.6-20.5 2.2-20.5-8.5v-67H140c-6.6 0-12-5.4-12-12z\"><\/path><\/svg>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Submit Enquiry<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/button>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/form>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Home\/ Materials\/ Stainless Steel\/ Martensitic Stainless \u2014 410 \/ 420 \/ 440C Martensitic Stainless Steel CNC Machining Martensitic StainlessSteel Machining 410 \/ 420 \/ 440C 440C up to HRC 60 Heat Treatment Coordination Precision Grinding Post-HT Bearings \u00b7 Valves \u00b7 Cutlery \u00b7 Surgical CNC machining of 410, 420, and 440C martensitic stainless steel \u2014 the [&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-158","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>Martensitic Stainless Steel CNC Machining | 410, 420, 440C | HXCNC<\/title>\n<meta name=\"description\" content=\"CNC machining of martensitic stainless steel grades 410, 420 and 440C. 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