Ductile Iron

Ductile iron (DPI) is a cast iron material made by adding a small amount of nodulizer (such as magnesium) to traditional cast iron to transform the graphite structure into a spherical shape. Ductile iron exhibits excellent mechanical and processability. Compared to gray cast iron, it offers higher tensile strength, toughness, wear resistance, and fatigue resistance. Its excellent casting properties enable it to excel in the manufacture of complex castings. Through precise alloying and processing, ductile iron delivers stable performance in diverse operating environments, meeting the demands of various structural and load-bearing components.

In the precision casting industry, ductile iron is widely used in industries such as automotive, construction machinery, and pipeline equipment due to its excellent casting process adaptability and cost-effectiveness. It enables the production of complex, high-precision components through precision casting technology, and exhibits excellent mechanical properties, enabling stable operation under high loads and harsh operating conditions. Whether it’s a complex precision component or a large-scale structural part, our ductile iron castings can be tailored to your specific needs, providing reliable solutions for a variety of high-end applications.

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Common Material Grades of Ductile Iron

Alloy Name	Material Properties	Application Industry	Sample Widget
Ductile Iron (SG Iron)	Excellent strength, toughness, wear resistance, fatigue resistance, good castability, good impact toughness and crack resistance	Automobile, construction machinery, precision casting	Automobile engine cylinder block, gear box housing, brake disc, hydraulic cylinder block
QT400-18	Good tensile strength (400 MPa), impact resistance, and high fatigue strength, suitable for components subjected to greater pressure and impact	Construction machinery, agricultural machinery, precision casting	Excavator parts, agricultural machinery parts, marine engine housings
QT450-10	High tensile strength (450 MPa) and good ductility, suitable for structural parts with medium loads	Automobile, machinery manufacturing, precision casting	Automobile control arms, automobile steering systems, transmission components
QT500-7	High tensile strength and toughness, strong crack resistance, widely used in parts subjected to high stress and impact	Automobile, construction machinery, precision casting, machinery manufacturing	Automobile wheels, flywheels, engine brackets, oil pump housings
QT600-3	With excellent wear resistance and fatigue resistance, good corrosion resistance, suitable for high strength and wear-resistant working conditions	Engineering machinery, chemical industry, mining machinery, precision casting	Large mechanical parts, mining machinery housings, wear-resistant pump bodies, bearing housings
QT800-5	High strength and toughness, excellent corrosion resistance, suitable for the manufacture of high-load and high-impact components	High-end automobile manufacturing, aerospace, precision casting	Aircraft engine casings, large mechanical components, automobile wheels, machine tool beds
QT900-3	Ultra-high strength, suitable for extreme working environments, with good crack resistance and wear resistance	High-intensity application areas, such as wind power, nuclear power, and automotive industry	Wind turbine tower bases, nuclear power pressure vessels, oversized wheels and rotating parts
EN-GJS-400-18	Excellent casting properties, good strength, toughness and fatigue resistance, suitable for casting of conventional industrial parts	Automobile, machinery manufacturing, precision casting	Wind turbine tower bases, nuclear power pressure vessels, oversized wheels and rotating parts
EN-GJS-400-18	High tensile strength and fatigue resistance, suitable for parts requiring greater strength and toughness	Automobiles, machinery and equipment, precision casting	Automobile front and rear axles, suspension systems, and automated mechanical transmission components

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Nickel and Its Alloy Casting Process

Investment Casting

Features:
Sand casting offers high flexibility and is suitable for producing medium- to large-sized ductile iron parts. This process is suitable for larger production runs, offering excellent cost-effectiveness and reliability. It is particularly well-suited for castings with complex shapes that do not require extreme precision. The combination of ductile iron’s excellent castability and sand casting results in castings with excellent mechanical properties and low production costs.

Applications:
Suitable for medium-to-high-strength components such as automotive engine mounts, gearbox housings, hydraulic pump bodies, and industrial equipment casings.

If your needs are to mass-produce ductile iron parts with complex shapes or large sizes, sand casting will be a very suitable choice, which can ensure good strength, toughness and relatively economical production costs.

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3D Printing

Features:
3D printing can produce complex ductile iron parts, making it particularly suitable for low-volume production and prototyping. While 3D printing of ductile iron is more complex and expensive than other alloys, it still offers a promising solution for prototyping, complex structural geometries, and customized needs.

Suitable for:
Small-batch custom parts, rapid prototyping, and complex industrial parts.

If your needs are small-batch production or rapid prototyping, 3D printing can quickly produce complex-shaped ductile iron parts, which is particularly suitable for customized needs in engineering machinery, automotive industry and other fields.

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Start Your Project with Leierwo

1. Submit Your Inquiry

Send your CAD drawings and 3D files via email, specifying material grade, order quantity, surface finish, or any other relevant details.

2. Cost Calculation

Once we receive your design, our engineering team will carefully evaluate the drawings and calculate the price based on actual production costs as soon as possible.

3. Start Production

Upon pricing approval, our production team will prepare the materials and schedule production promptly.Leierwo always ensures on-time delivery.

4. Arrange Delivery

After production is completed, we will provide packaging details and arrange shipment via sea or air. We support global shipping for every order.

FAQ

Q1. Are you a trading company or a manufacturer?

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.

Q2. Can you quote based on 3D drawings?

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.

Q3. How do you handle RFQs (Request for Quotation)?

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.

Q4. What is your typical lead time?

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.

Q5. Do you provide samples? Are they free?

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.

Q6. What payment methods do you accept?

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.

Q7. How do you ensure quality control?

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.

Q8. Do your products come with a warranty?

Yes, we guarantee that all materials used are 100% genuine and as specified.

Q9. How do you view your relationship with customers?

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.