Categorie Produs
CIR — 11 Product Lines
Fontă
CNC
Piese
11 product lines in gray iron HT250/HT300 and ductile iron QT450/QT500/QT600 — equipment bases, machine tool bases, pump and valve bodies, gearbox and reducer housings, guideway bases, support seats, flange seats, and heavy connectors.
Vibration Damping Capacity by Material
Material
Damping
Aplicație
Gray Iron HT250
~0.3–0.5%
Machine tool bed ◀
Ductile Iron QT500
~0.1–0.2%
Heavy structure
Cast Steel
~0.02–0.05%
High-load frame
Al 6061
~0.01%
Lightweight parts
10×
Damping vs Steel
H7
Standard alezaj
11
Game de produse
10×
Damping vs Steel
H7
Bore Standard
1.5×WP
Test de presiune
24hr
Ofertă
Bază echipament ✦
Machine Tool Base ✦
Corp pompă ✦
Corp supapă ✦
Scaun flanșă ✦
Șa de suport ✦
Cutie / Carcasă ✦
Bază ghidaj ✦
Industrial Housing ✦
Carcasă reductoare ✦
Conector greu ✦
Bază echipament ✦
Machine Tool Base ✦
Corp pompă ✦
Corp supapă ✦
Scaun flanșă ✦
Șa de suport ✦
Cutie / Carcasă ✦
Bază ghidaj ✦
Industrial Housing ✦
Carcasă reductoare ✦
Conector greu ✦
Gama completă de produse
11 Cast Iron CNC Parts Across
3 categorii de aplicații
Gray Iron HT250/HT300 · Ductile Iron QT450/QT500/QT600 · H7 Bore · Pressure Tested · MOQ 1 piece
Categorii de produse
Bases & Structural PartsCitat →
Four gray iron structural and base parts — equipment bases, machine tool base components, support seats, and guideway bases. Gray iron HT250/HT300 is the definitive material for machine tool beds and equipment bases because of its unique combination of vibration damping (10× better than cast steel), dimensional stability under long-term static load, excellent compressive strength, and good machinability. A gray iron machine tool bed suppresses chatter vibration that persists in welded steel frames, directly improving the surface finish of parts machined on it.
CIR-002/008
STRUCTURAL / 002 & 008 — FEATURED
Machine Tool Base Parts & Guideway Bases
HT300 alloyed gray iron machine tool base components and precision guideway bases — the structural backbone of lathes, milling machines, grinding machines, and coordinate measuring machines. Gray iron's vibration damping capacity (specific damping ~0.3–0.5%) is approximately 10× higher than cast steel (~0.03%) and 30× higher than aluminium — the graphite flakes in the microstructure absorb vibration energy by converting mechanical motion to heat at grain boundaries. This directly suppresses chatter vibration during cutting, enabling finer surface finish and tighter tolerance without requiring slower cutting speeds. Guideway bases: flatness ±0.01mm/1000mm by precision surface grinding; ±0.005mm/1000mm by hand scraping (traditional precision finishing method still used on the highest-precision machine tool beds). Stress-relief annealing at 600°C performed before precision machining — removes casting residual stresses that would cause dimensional change after machining and in service. Machine tool base mounting holes: ±0.05mm position; face flatness ±0.02mm. HT300 Cr/Ni/Mo alloyed for improved wear resistance of guideway surfaces vs standard HT250.
HT250 · HT300 · HT300 alloyedSolicită ofertă
CIR-001/006
STRUCTURAL / 001 & 006
Equipment Bases & Support Seats
HT250 / QT450 equipment bases (face flatness ±0.02mm, mounting holes ±0.05mm) and support seats/saddles (face ±0.02mm, bore H7). CNC milled mounting surfaces; stress-relief annealed before precision machining. Anchor bolt bosses and levelling pad faces machined integral. Dimensional stability for long-term service.
HT250 · QT450 · QT500Solicită ofertă
Materiale: HT250 (GB/T 9439) · HT300 alloyed · QT450/QT500 (GB/T 1348)
Solicită Toate 4 →
Fluid & Pressure PartsCitat →
Three cast iron fluid and pressure parts — pump bodies, valve bodies, and flange seats. Gray iron HT250 is the standard material for pump and valve bodies in water, oil, and non-corrosive fluid systems — excellent castability enables complex internal water-passage geometry impossible in machined-from-solid parts. Ductile iron QT450/QT500 specified where the pump or valve experiences impact loading (pressure surges, water hammer) that would crack gray iron. All pump and valve bodies pressure-tested at 1.5× working pressure with water or hydraulic oil before delivery.
CIR-003/004
FLUID / 003–004 — FEATURED
Pump Bodies & Valve Bodies
HT250 gray iron and QT450/QT500 ductile iron pump bodies and valve bodies for water, oil, and process fluid systems. Gray iron HT250 standard for low-to-medium pressure pump and valve applications (≤10 bar water, ≤20 bar oil) — excellent castability, good machinability, adequate corrosion resistance in water and mineral oil. QT450/QT500 ductile iron for higher pressure and impact-loaded pump/valve bodies where gray iron brittleness would be a risk. Internal water passages cast integral to the foundry pattern — not machined, preserving smooth flow geometry. Precision CNC machining of: bore H7 (±0.010–0.025mm) for impeller or valve spool fit; seal face Ra ≤0.4μm for lip seal or mechanical seal interface; flange face flatness ±0.02mm; port thread NPT/BSP/G to standard; mounting foot and base flatness ±0.02mm. Pressure test: hydrostatic test at 1.5× working pressure with water for minimum 30 minutes — standard on all pump and valve bodies. No pressure leakage accepted. Test certificate included.
HT250 (GB/T 9439) · QT450/QT500 (GB/T 1348)Solicită ofertă
CIR-005
FLUID / 005
Flange Seats
HT250 flange seats and flange adapters. Face flatness ±0.02mm; bolt pattern ±0.05mm; sealing face Ra ≤0.4μm. ASME/DIN/PN standard bolt circle patterns. Hydrostatic pressure test at 1.5×WP standard. Stress-relief annealed before machining for dimensional stability.
HT250 · QT500Solicită ofertă
Materiale: HT250 (GB/T 9439) · QT450/QT500 (GB/T 1348)
Solicită toate cele 3 →
Housings & ConnectorsCitat →
Four cast iron housing and connector parts — gearbox/housing bodies, industrial equipment housings, reducer housings, and heavy connectors. Gearbox and reducer housings require bearing bore H7 with bearing bore pair concentricity ≤0.02mm — the critical specification that determines gear mesh quality. Ductile iron QT500/QT600 for heavy connectors requiring higher tensile strength and impact resistance than gray iron.
CIR-007/010
HOUSING / 007 & 010 — FEATURED
Gearbox Housings & Reducer Housings
HT250 gray iron gearbox housings and QT500 ductile iron speed reducer housings for industrial gear drives, worm reducers, bevel gear units, and planetary gearboxes. Bearing bore H7 is the standard — but bearing bore pair concentricity ≤0.02mm is the critical specification that determines gear mesh quality and bearing life: if the two bearing bores supporting opposite ends of a gear shaft are not coaxial, the shaft bends, the gear mesh load distributes unevenly, and bearing life is significantly reduced. We bore bearing bore pairs on the same horizontal boring machine setup without re-fixturing — maintaining concentricity ≤0.02mm by single-setup boring of both bores in sequence. Oil seal face Ra ≤0.4μm for lip seal sealing. Split housing: mating face flatness ±0.01mm; dowel pin reaming for accurate re-alignment after disassembly. Oil drain and fill plug bosses tapped integral. Mounting foot face flatness ±0.02mm. Pressure-tested (oil at 1.2× working pressure) for all sealed gear units.
HT250 · QT500 · QT600Solicită ofertă
Materiale: HT250 · QT500 · QT600 (GB/T 1348)
Solicită Toate 4 →Capacități de fabricație
What Cast Iron Parts Require
Beyond Standard Steel Machining
🌡
Stress-Relief Anneal Before Precision Machining
Castings contain residual stresses from non-uniform cooling during solidification. If machined without stress relief, residual stresses redistribute after rough machining, causing dimensional change (distortion) during subsequent precision machining and in service. We stress-relief anneal all cast iron precision parts (equipment bases, machine tool beds, guideway bases, gearbox housings) at 550–600°C for 2–4 hours before precision machining — the single most important step for long-term dimensional stability.
550–600°C anneal2–4 hours
🔩
Single-Setup Boring for Concentricity
Gearbox and reducer housing bearing bore pairs must be concentric to ≤0.02mm — this is only achievable by boring both bores in the same horizontal boring machine setup without re-fixturing. Re-fixturing between bore operations introduces cumulative position error of 0.05–0.2mm that cannot be removed without starting over. We fixture gearbox housings for single-setup boring of all bearing bores in sequence and measure concentricity by CMM before delivery.
Single-setup boringConc. ≤0.02mm
💧
Hydrostatic Pressure Testing — 1.5× WP
All pump bodies, valve bodies, and sealed fluid housings hydrostatic pressure-tested at 1.5× working pressure with water for minimum 30 minutes. No pressure drop accepted — any casting porosity, shrinkage, or crack that would cause leakage in service is detected and rejected. Test certificate with test pressure, duration, and result enclosed with every tested part.
1.5× WP water30 min minimumTest cert
Specificații de precizie
Tolerances & Grade Reference — Piese din fontă
📐
Toleranțe după caracteristică
Bore
H7
Bearing Bore Conc.
≤0,02 mm
Planeitatea Feței
±0,02 mm
Guideway Flat
±0.01/1000mm
Ra Față de Etanșare
Ra ≤0,4 μm
Bolt Pattern
±0,05 mm
⚙
Grade & Property Reference
HT250 Damping
~10×
vs cast steel. Machine tool bed standard. Graphite flake vibration absorption.
QT500 Elongation
~7%
Ductile iron (SG iron). Nodular graphite. Impact resistant — gray iron brittle.
Test de presiune
1.5× WP
Hydrostatic 30 min water test. Pump and valve bodies. Certificate standard.
Stress Relief
550–600°C
Before precision machining. Removes casting residual stress. Dimensional stability.
Selecție de materiale
Cast Iron Grades for Every Heavy Industrial Application
Cast iron grade selection is determined by the primary loading condition: static compressive (gray iron), tensile/impact (ductile iron), or guideway wear resistance (alloyed gray iron).
MAT / 01
HT250 Gray Iron
~250 MPa · 10× damping · Best machinability
Standard gray iron for machine tool beds, equipment bases, pump and valve bodies, and gearbox housings. Graphite flakes provide vibration damping and machinability. Cannot be welded (cracks) and brittle under impact — but ideal for static compressive loaded structures. GB/T 9439 grade.
Machine toolsPump/valve
MAT / 02
HT300 Alloyed Gray Iron
~300 MPa · Wear resistant · Guideway grade
HT300 with Cr/Ni/Mo additions for improved wear resistance and strength. Standard for machine tool guideways and sliding surfaces requiring hardened wear resistance. Surface hardening (flame or induction) possible to HRC 45–55 on guideway surfaces. GB/T 9439.
GuidewaysSurface hardenable
MAT / 03
QT450 / QT500 Ductile Iron
450–500 MPa · 10–17% elongation · Tough
Nodular (spheroidal graphite) cast iron — significantly tougher than gray iron. Used where impact loading, pressure surges, or tensile stress would crack gray iron: pump bodies for high-pressure service, reducer housings, heavy connectors, and support structures under dynamic load. GB/T 1348.
High pressureReducer housing
MAT / 04
QT600 Ductile Iron
600 MPa · Higher strength · Heavy connectors
QT600 pearlitic ductile iron — 600 MPa UTS, approaching cast steel strength. Used for heavy structural connectors and parts where QT500 tensile strength is insufficient and cast steel would add excessive cost. Impact resistance better than gray iron. GB/T 1348.
Heavy connectors
Flux de lucru pentru producție
From Casting to Precision-Machined, Tested Cast Iron Part
01
Revizuire DFM
Grade (HT250/HT300/QT500), stress-relief requirement, pressure test scope, and single-setup boring strategy confirmed.
02
Turnare
Sand cast or shell cast to drawing. GB/T 9439 (gray) / GB/T 1348 (ductile). Material cert and hardness check.
03
Stress Relief
550–600°C stress-relief anneal 2–4 hours for all precision bases, housings, and guideway parts.
04
CNC Machine
Bore H7; single-setup boring for bearing bore concentricity; face grinding ±0.01mm; seal face Ra ≤0.4μm.
05
Test de presiune
Pump/valve: hydrostatic 1.5×WP water, 30 min. No leakage accepted. Pressure test certificate issued.
06
Inspect & Deliver
CMM report: bore H7, concentricity, face flatness. Material cert + pressure test cert enclosed.
Avantajul nostru
Why Machine Builders Choose Our Piese din fontă
SR
Stress Relief — Always Before Precision Machine
We stress-relieve all precision cast iron parts (bases, housings, guideway beds) before precision machining — not just on request. Castings without stress relief distort after machining when residual stresses redistribute. A machine tool base that is flat today may be out-of-flat within weeks without stress relief.
1SET
Single-Setup Boring — Concentricity ≤0.02mm
Bearing bore pairs in all gearbox and reducer housings bored in single horizontal boring machine setup — not in two setups. Re-fixturing between bores introduces position error that prevents achieving concentricity ≤0.02mm. CMM concentricity measurement documented in inspection report on every housing.
1.5×
Pressure Test — Certificate Standard
All pump and valve cast iron bodies hydrostatic pressure-tested at 1.5× working pressure for 30 minutes with water — not sampled per batch, not relied on casting quality control alone. Casting porosity that passes visual inspection and is undetectable without pressure testing will leak in service. We detect it before delivery.
Gray
Gray vs Ductile Advisory at DFM
We advise on gray vs ductile iron selection at DFM review based on loading condition. Gray iron (HT250) for vibration-damping and compressive-loaded structures; ductile iron (QT450/QT500) where tensile stress, impact, or pressure surges would crack gray iron. Over-specifying ductile iron adds cost; under-specifying causes brittle fracture.
Întrebări frecvente
Cast Iron CNC Parts — Întrebări frecvente
HT250 gray iron (GB/T 9439): 250 MPa, best vibration damping (10× steel), excellent machinability. Machine tool beds, equipment bases, pump/valve bodies, housings. HT300 alloyed: improved wear resistance, guideway grade, surface-hardenable. QT450/QT500 ductile iron (GB/T 1348): 450–500 MPa, 10–17% elongation, impact resistant. High-pressure pump bodies, reducer housings, heavy connectors. QT600: 600 MPa, near cast steel strength, for heavy connectors where QT500 is insufficient.
Three irreplaceable properties: (1) Vibration damping 10× steel — graphite flakes absorb chatter, improving machined surface finish; (2) Dimensional stability under long-term static load — stays flat for decades once stress-relieved and precision machined (steel frames relax and require periodic re-levelling); (3) Compressive strength — cast iron performs excellently under the compressive loads of a machine tool bed. These three properties together, at lower cost than fabricated steel, make gray iron the undisputed machine tool bed material.
Bore: H7. Bearing bore concentricity: ≤0,02mm (single-setup boring). Face flatness: ±0,02mm by surface grinding; ±0.01mm/1000mm for guideway bases by precision grinding. Seal face Ra: ≤0.4μm. Bolt pattern: ±0.05mm. Guideway by scraping: ±0.005mm/1000mm. Stress-relief annealing before precision machining is the essential prerequisite — without it, residual stresses redistribute and distort the part after machining.
MOQ: 1 piece machining from supplied or procured casting. Lead times: machining from supplied casting: 5–10 working days. With casting procurement (standard patterns): 15–25 working days. New pattern + casting + machining: 30–45 working days. Stress-relief anneal adds 5–7 working days — strongly recommended for all precision parts. Pressure test certificate included for all pump/valve bodies.
Date structurate (FAQPage + ItemList + schema Product) încorporate · Eligibil pentru rezultate bogate Google FAQ
Solicită o ofertă
Trimite-ți desenul.
Obține o ofertă.
Fiecare solicitare include o revizuire DFM — fezabilitatea toleranței, confirmarea materialului și abordarea procesului înainte de începerea producției. MOQ 1 piesă.
24hr
Răspuns la ofertă
MOQ 1
Prototipuri OK
ISO
9001:2015
📐
Revizuire DFM pentru fiecare solicitare
Fezabilitatea toleranței, strategia de fixare și confirmarea materialului. Feedback specific și acționabil — nu respingeri generice.
🎯
Inspecția primului articol — Standard
Raport FAI pentru fiecare lot nou. Certificări de material și tratament de suprafață incluse cu fiecare livrare.
🔄
Același proces: prototipare până în producție
Planul de proces din prototipul dumneavoastră se aplică loturilor de producție. Fără re-qualificare atunci când scalați.
⚙
Frezare CNC 3 / 4 / 5-Axis + Strunjire
Piese structurale complexe, arbori, carcase și componente de transmisie. Metale și plastice de inginerie.
ISO 9001:2015
Frezare 3/4/5-Axis
Frezare în strung CNC
Inspecție CMM
Livrare globală