Gray Iron
In the precision casting industry, gray cast iron, due to its excellent castability and stable mechanical properties, is widely used in the production of castings requiring high precision and strength. It is particularly well-suited for complex shapes and large-scale structural components, capable of withstanding heavy loads and shocks, and performing exceptionally well in long-term operation. Whether it’s a complex precision component or a large-scale structural part, our gray iron castings can be tailored to your specific needs, providing reliable solutions for a variety of high-end applications.
Common Material Grades of Gray Iron
| Alloy Name | Material Properties | Application Industry | Sample Widget |
| GG25 (EN-GJL-250) | Contains flake graphite, good castability, processability and wear resistance, suitable for parts subjected to greater pressure | Automobile, machinery manufacturing, construction, home appliances | Engine blocks, lathe beds, machine tool guide rails, pump housings, bearing seats, brake discs |
| GG30 (EN-GJL-300) | High tensile strength (300 MPa), good impact toughness and wear resistance, suitable for parts bearing medium loads | Automobiles, heavy machinery, precision casting, pumps and valves | Gearbox housings, pump bodies, engine cylinder heads, mechanical parts, pressure vessels |
| GG35 (EN-GJL-350) | High tensile strength (300 MPa), good impact toughness and wear resistance, suitable for parts bearing medium loads | Engineering machinery, chemical equipment, shipbuilding, precision casting | Turbine housings, marine engine brackets, mining machinery parts, pressure vessels |
| GG40 (EN-GJL-400) | High strength and good wear resistance, suitable for precision casting under high load environment, with good high temperature resistance | Engineering machinery, power generation equipment, petrochemicals, automobile manufacturing | Turbine blades, diesel engine parts, large machinery parts, pipe supports |
| GG50 (EN-GJL-500) | Higher tensile strength (500 MPa), stronger fatigue resistance and impact resistance, suitable for components subjected to higher stress | Automobile, aerospace, machinery and equipment manufacturing, precision casting | Automobile chassis brackets, crane hooks, aircraft engine casings, industrial pump bodies |
| GG60 (EN-GJL-600) | With very high tensile strength and strong wear resistance, it is suitable for high-load components in extreme environments | High-end machinery, engineering equipment, mining machinery, precision casting | High-strength gears, marine engine housings, mining machinery gearboxes, pressure vessels |
| GG70 (EN-GJL-700) | Ultra-high tensile strength (700 MPa), high wear resistance and impact resistance, suitable for heavy equipment components subjected to extremely high pressure | Heavy machinery, metallurgy, and steel industry | Heavy machinery parts, large mining machinery gears, large pump bodies, large pressure vessels |
| GG15 (EN-GJL-150) | Lower strength, but with excellent casting performance and processability, suitable for parts that do not require high strength | Home appliances, auto parts, and instrument manufacturing | Motor housing, home appliance body, low-load mechanical parts |
Gray Iron Casting Process
Sand Casting
Sand casting is well-suited for gray cast iron production, enabling the rapid and efficient production of complex, large-scale castings. Gray cast iron’s excellent casting properties and stable physical properties make it suitable for the production of large quantities of standardized or customized parts. Sand casting also effectively preserves the advantages of gray cast iron, such as good wear resistance, low cost, and high impact toughness.
Medium-to-high strength mechanical components, automotive engine mounts, gearbox housings, hydraulic pump bodies, etc.
3D Printing
3D printing technology is suitable for producing complex geometries and small-batch custom parts. Although 3D printing of gray cast iron is somewhat more challenging than with other materials, precision sand mold printing technology can still meet certain customization requirements for gray cast iron, making it particularly suitable for prototyping and rapid, low-volume production. 3D printing is also suitable for producing parts with complex internal structures, avoiding the mold limitations of traditional casting processes.
Low-volume custom parts, rapid prototyping, and parts with complex shapes or internal channels.
Start Your Project with Leierwo
1. Submit Your Inquiry
2. Cost Calculation
3. Start Production
4. Arrange Delivery
FAQ
We are a factory with over 20 years of experience in casting and machining. We have rich expertise in this industry. If you come across suppliers claiming to produce castings in a wide range of materials (such as steel, iron, stainless steel, copper, etc.), they are likely trading companies. If you see workshops actively producing parts, you can be assured that we are a genuine manufacturer.
Yes, as long as we receive CAD files or compatible 3D models that can be viewed with software like First Quote or Firstcut browser, we can provide a quotation. Please note that 2D drawings alone are insufficient for manufacturing precision components.
We support 3D CAD models from SolidWorks (.sldprt), ProE (.prt), and other CAD systems, commonly in IGES (.igs), STEP (.stp), ACIS (.sat), or Parasolid (.sat) formats.
We have an internal service system that responds to emails within 4 hours. If your request is urgent, please specify it in your email so we can prioritize your inquiry.
For rapid prototyping:
Silica sol casting: 20–30 days
Sand casting: 7–10 days
For mass production with machining included, the typical lead time is 45–60 days.
More complex parts may require a different delivery schedule.
Yes, we provide samples based on your drawings for you to confirm structure and quality. If the sample does not meet your requirements, we will replace it free of charge until it is qualified.
We accept T/T (bank transfer), Alipay, credit card, etc. Typically, we require a 30% down payment upon order confirmation and the remaining 70% before shipment. For custom parts with complex requirements, additional pricing terms may apply.
We have a comprehensive quality control system that covers every step, from raw material procurement to machining processes and final inspection. For critical components, we strictly follow drawing standards and customer specifications.
All customer data is kept confidential. Only trained engineers are authorized to handle production orders. Third-party inspection or factory audits are welcome, or you may use our in-house quality team for final inspection.
Yes, we guarantee that all materials used are 100% genuine and as specified.
We value long-term cooperation and support our customers’ production needs.
We believe every honest customer is a friend, and we treat our partnerships sincerely—building friendships and strong teams regardless of where our customers come from.
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