Iron Casting Service
Supro MFG provides iron casting services for OEM buyers who need durable cast iron parts from drawing review to production. We support gray iron, ductile iron and malleable iron components for pumps, valves, machinery frames, agricultural equipment, construction equipment and industrial hardware. Before quoting, our team reviews material grade, process route, machining allowance, surface treatment and inspection requirements, helping buyers reduce risk before tooling or batch production.
- ISO 9001-2015 and TSI 16949 quality system
- 3 casting workshops and 120 technical employees
- 18 quality engineers and inspection report support
- Founded in 1997 with an 8,800 sq.m facility
iron casting : most recognized casting technology
iron casting plays a very important role in mechanical engineering nowadays, and many metal parts with complex structures that need to have load-bearing capacity choose to rely on iron casting technology. Similar to steel casting, molten iron is injected into a mold for cooling and forming, resulting in the final iron cast part we need.
With high efficiency and cost effectiveness, iron cast parts are used in a wide variety of industries for a variety of applications. With quality heat treatment and surface treatment, iron castings can have excellent corrosion resistance and high strength.
Materials and Grade Selection
Cast Iron Materials and Grade Options
Cast iron material selection should match load, vibration, impact, wear and machining needs. Supro MFG can review common gray iron and ductile iron grades, part weight, process route, machining allowance and inspection requirements before quotation.
grey iron casting parts
Gray iron, including HT200, HT250, HT300 and HT350 under GB standards, is selected where vibration damping, compressive strength and machinability take priority over impact resistance. These grades correspond broadly to ASTM A48 No.30, No.35, No.45 and No.50, EN-GJL-200 to EN-GJL-350, and DIN GG20 to GG35. We can review gray iron castings from 0.5 kg to 2,000 kg per piece for machine bases, pump housings, valve bodies, covers and engine blocks.
ductile iron casting parts
It is easy to machine, has good fatigue and yield strengths, and is also wear resistant. However, its best known characteristic is ductility. Common grades include QT450-10, QT450-18 and QT500-7 under GB standards, with related ASTM grades 65-45-12, 60-40-18 and 80-55-06, EN-GJS-450-10, EN-GJS-450-18 and EN-GJS-500-7, and DIN GGG-40 / GGG-50.Ductile iron is used in the manufacture of steering joints, plow heads, crankshafts, heavy gears, car and truck suspension components, hydraulic components and automotive door hinges.
Malleable iron casting parts
Attractive properties of malleable cast iron are its ability to retain and store lubricants, non-abrasive wear particles, and porous surfaces that trap other abrasive debris. Malleable cast iron is used for heavy bearing surfaces, chains, sprockets, connecting rods, driveline and axle components, railroad rolling stock, and agricultural and construction machinery.
| Cast Iron | Standards | |||||
| GB | AWS | BS | NF | DIN | ISO | |
| Grey Iron | HT200 | No.30 | Grade 220 | EN-GJL-200 | GG20 | 200 |
| HT250 | No.35 | Grade 260 | EN-GJL-250 | GG25 | 250 | |
| HT300 | No.45 | Grade 300 | EN-GJL-300 | GG30 | 300 | |
| HT350 | No.50 | Grade 350 | EN-GJL-350 | GG35 | 350 | |
| Ductile Iron | QT450-10 | 65-45-12 | GGG-40 | EN-GJS-450-10 | 450/10 | 450-10 |
| QT450-18 | 60-40-18 | GGG-40 | EN-GJS-450-18 | 400/18 | 450-18 | |
| QT500-7 | 80-55-06 | GGG-50 | EN-GJS-500-7 | 500/7 | 500-7 | |
Cast Iron or Steel Casting?
Use cast iron when damping, machinability and cost control are more important than severe impact resistance. Use steel casting when the component requires higher tensile strength, weldability or heavy shock-load performance. If the material choice is unclear, Supro MFG can review the application and connect the project with the proper material route. View steel casting for higher strength applications.
Design - Prototype - Molds - Casting
Visit Supro Metal Casting Foundry
Supro Metal Foundry is China leading metal casting parts manufacturer, founded in 1997, with continuous upgrading of casting technology and replacement of advanced casting equipment, we have become an industry-leading casting enterprise, covering an area of 8,800 square meters, with three castings The workshop, a precision cnc machining and surface coating workshop, has 120 technical employees, 18 quality engineers, and 17 core company management. Provide stable metal casting parts supply projects for 3800+ purchasing companies from China and the world.
We specialize in metal castings with various complex structures, and use our rich knowledge of casting materials and casting experience to deliver high-quality metal casting parts to customers on time through professional casting techniques.
Whether rapid casting prototype or high volume casting, we can provide strong casting capabilities, including: product design and optimization, mold design and manufacturing, metal casting process, quality control, precision CNC machining, material and physical property testing, surface coating , as well as one-stop metal casting services such as packaging and transportation.
Process Options
Foundry Process Options for Cast Iron Components
The right foundry process depends on part size, surface requirement, tolerance expectation, annual volume and material grade. We do not push every project into one route. The process is selected after drawing review.
iron green sand casting
Supro MFG has advanced die casting manufacturing equipment to meet the needs of low pressure die casting and high pressure die casting products, we provide the most cost-effective on-demand die casting manufacturing solutions for buyers from all walks of life around the world, and through x-ray, composition analysis, Non-destructive testing, mechanical testing, salt spray testing, etc., to ensure on-time delivery of high-quality die-casting parts.
iron Shell mould casting
relying on resin sand or green sand to form a cavity with the shape of the final product under the action of aluminum or steel molds, inject molten metal into the sand mold, and cool to form. Aluminum alloy sand casting is economical, but usually requires secondary machining to achieve close dimensional tolerances, and is also very effective for creating large aluminum alloy cast parts or parts with fine detail, suitable for large-scale casting projects.
At Supro casting foundry, we control the casting process and the element composition of the aluminum alloy reasonably to avoid most of the defect problems, enhance the mechanical properties, improve the casting efficiency, and make the aluminum alloy castings more competitive.
Advantages: high efficiency, low cost, economical, complex structure can be realized, suitable for a wide range of materials
Disadvantages: There are many sand holes and pores, and the surface is rough. It is impossible to build fine details.
Iron Resin sand casting
Creates steel molds and other metal molds or cores. The molten aluminum alloy is cooled and formed inside the mold. This is a reusable metal mold. More often, the aluminum alloy is injected by gravity to fill the mold cavity. Inside. The mold is then separated after cooling and the finished part is ejected or removed.
Supro MFG uses this rapid prototyping casting process to achieve a more consistent microscopic metal structure, increase the density of aluminum alloy castings, and significantly enhance the mechanical properties of the product. It is generally used in industries with high weighing capacity, wear resistance, and corrosion resistance. in demand.
Advantages: Higher product density Fast build time Low product cost High surface finish Finer detailing possible
Disadvantages: High mold cost Does not support design changes Not suitable for large castings Long mold manufacturing cycle
Engineering Support
Engineering Review Before Production
A successful casting project starts before molten metal is poured. Supro MFG reviews wall transitions, sharp corners, rib thickness, boss design, core structure, machining allowance and surfaces that may be difficult to clean or machine. This review helps reduce shrinkage, sand inclusion, porosity, deformation, hard spots and machining difficulty while keeping the function of the part unchanged.
- Wall thickness, draft angle and ribs review
- Parting line, core structure and cleaning difficulty check
- Machining allowance and critical area confirmation
Quality Control
Quality Control and Inspection Reports
Buyers need stable material composition, reliable dimensions and repeatable batches. Supro MFG controls cast iron projects through material verification, melt control, mold preparation, pouring control, cleaning, machining inspection and final shipment review. Depending on project requirements, inspection can include CMM dimensional inspection, spectrometer chemical analysis, mechanical property testing, destructive testing when required, non-destructive testing and final packing review.
Material Verification
Spectrometer chemical analysis and material certificate support.
Mechanical Testing
Mechanical property testing and destructive testing when required.
Dimensional Inspection
CMM and machining area checks for critical dimensions.
NDT Support
Non-destructive testing and final packing review based on project needs.
Ready to send a drawing?
Upload your 2D/3D file and ask for material, process and inspection review.
Secondary Operations
Machining, Heat Treatment and Surface Finishing
Secondary operations should be planned before quotation because they affect tooling, machining allowance, inspection and shipment readiness.
CNC Machining
CNC machining for mounting faces, sealing surfaces, holes, threads and assembly areas.
- CNC machining for cast iron parts
- Machining area verification
- Critical dimension inspection
Heat Treatment
Heat treatment can be reviewed when strength, hardness, stress relief or dimensional stability matters.
- Heat treatment for cast iron parts
- Hardness requirements
- Application-based review
Surface Finishing
Finishing options include sand blasting, painting, powder coating, chrome or tin plating, acid etching, galvanizing and polyamide coating.
- Surface finishing for cast iron parts
- Corrosion exposure review
- Appearance and packing requirements
Wide range of iron casting applications
- Value Body
- Compressor Valves
- Coupling
- Chain wheel
- Hydraulic valves and
- cylinders
- Structural brackets
- Rollers
- Cable reel
- Frames
- Pumps
- Crankshaft
- Camshaft
- Exhaust manifold
- Machine Frame
- Flanges
- Hubs
- Gearboxes
Buyer Questions
FAQ for Cast Iron Part Sourcing
These questions focus on RFQ preparation, material selection, inspection and post-delivery quality handling.
Please send the drawing or sample, material grade, quantity, annual volume, tolerance requirement, machining areas, surface finish, application and target delivery date. If the material grade is not fixed, our team can review the load condition and recommend gray iron, ductile iron or another route.
For 2D drawings, PDF, DWG and DXF are commonly reviewed. For 3D models, STP, STEP, IGES and OBJ can be checked. For large RFQ packages, please confirm the final accepted format with our team before submission.
Common gray iron discussions include HT200, HT250, HT300 and HT350, with related ASTM, EN and DIN references. Ductile iron discussions may include QT450-10, QT450-18 and QT500-7, with corresponding ASTM, EN-GJS and DIN grades.
Current project discussions can cover parts from about 0.5 kg to 2,000 kg per piece. Final feasibility still depends on geometry, wall thickness, process route, machining requirements and inspection standard.
Gray iron is often selected for damping, machinability and cost control. Ductile iron is used when higher strength, toughness and impact resistance are required. The correct route depends on load, fatigue risk, service environment and machining needs.
Steel casting is usually considered when the part needs higher tensile strength, weldability or heavy shock-load performance. Cast iron is often better for damping, machinability and cost-sensitive housings, bases and covers.
Inspection can include CMM dimensional checks, spectrometer chemical analysis, mechanical property testing, destructive testing when required, non-destructive testing and final packing review. Material certificates and inspection reports can be arranged based on project requirements.
Yes. Many cast iron components require CNC machining for holes, threads, sealing surfaces, mounting faces and assembly areas. Machining requirements should be included in the quotation and inspection plan.
If a buyer reports a quality issue, the process should include photo or report review, batch traceability check, root cause analysis and corrective action. Replacement, rework or credit terms should follow the confirmed purchase agreement and inspection standard.
Request a Quote
Upload Your Drawing for a Factory-Direct Quote
Send a 2D drawing, 3D file or sample photos with material grade, quantity, annual volume, machining areas, surface finish and inspection requirements. Our team will review your project and confirm a factory-direct quotation path.
- PDF, DWG or DXF for 2D drawings
- STP, STEP, IGES or OBJ for 3D models
- Material grade, quantity, annual volume and inspection needs
- Machining, surface finish and packing requirements