Product details description of ductile iron castings

Product Overview

Ductile iron castings, also known as high-strength ductile iron castings or ductile iron castings, are high-performance cast iron products in which graphite forms spherical or nodular shapes during the solidification process by adding spheroidizing agents (usually magnesium or cerium) to high-quality molten iron. This unique metallographic structure enables it to inherit the excellent castability, wear resistance and shock absorption of cast iron while achieving a qualitative leap in mechanical properties, and obtaining strength, toughness and plasticity that approach or even exceed those of cast steel.

Our ductile iron castings strictly follow international and domestic standards such as GB/T 1348, ISO 1083, ASTM A536, etc., and can provide a full range of products of various grades from QT350-22 to QT900-2 to meet different demands from general engineering parts to high-strength structural parts.

Core product advantages

Outstanding balance of strength and toughness

High strength: The tensile strength can reach over 900 MPa, capable of withstanding high loads and stresses.

High ductility: The maximum elongation can reach 22%, with excellent impact resistance and deformation capacity, effectively preventing brittle fracture.

Excellent fatigue strength: Suitable for components subjected to periodic or dynamic loads.

Excellent casting and processing performance

Good fluidity and low shrinkage rate: It can cast complex-shaped, thin-walled, and clearly contoured components with high dimensional accuracy.

Outstanding machinability: Compared with other high-strength materials, it is easier to undergo machining such as lathes, milling, and drilling, reducing tool wear and production costs.

Outstanding practical performance

Outstanding wear resistance and fatigue resistance: Graphite balls play a natural role in oil storage and lubrication, with excellent wear resistance.

Excellent shock absorption: It can effectively absorb mechanical vibration and noise, outperforming cast steel and enhancing the smoothness of equipment operation.

Certain corrosion resistance: It demonstrates better corrosion resistance than carbon steel in many environments.

Economy: Under the same performance requirements, its material and manufacturing costs are usually significantly lower than those of cast steel parts.

Production process and quality control

We adopt advanced production techniques to ensure the reliability and consistency of product performance

Precision melting and spheroidizing treatment: Precise melting is carried out using medium-frequency induction furnaces to control the chemical composition. Spheroidization and inoculation treatment are carried out by using the feeding line method or the flushing method. The process is stable, and the spheroidization rate can reach over 90% (grades 1-3).

Diversified styling techniques

Resin sand molding: Suitable for medium and large-sized, complex structural components, with high dimensional accuracy and good surface quality.

Damp mold sand molding: Suitable for large quantities of medium and small-sized castings, it features high efficiency and favorable cost.

Lost foam casting: It is suitable for components with extremely complex structures, has no parting surface, and offers high design freedom.

Strict heat treatment: According to the grade requirements, we offer heat treatment services such as annealing (to enhance toughness), normalizing (to increase strength and wear resistance), or isothermal quenching (to achieve ADI, combining ultra-high strength and toughness).

Full-process quality assurance

Spectral analysis: Ensure the precise composition of each batch of molten iron.

Metallographic examination: Regularly spot-check the morphology, spheroidization grade and matrix structure of graphite.

Mechanical property tests: Tensile, impact and hardness tests are conducted for each batch.

Non-destructive testing: We can provide ultrasonic (UT), magnetic particle (MT) or radiographic (RT) flaw detection services to ensure internal quality.

Application field

Our ductile iron castings are widely used in key components of the following industries:

Automotive industry: engine crankshaft, camshaft, differential housing, wheel hub, brake caliper, bracket.

Fluid equipment: valves, pump casings, impellers, pipes and pipe fittings.

Heavy machinery: gears, machine tool beds, hydraulic components, structural parts of construction machinery, wear-resistant parts of mining equipment.

Electricity and Wind Power: Wind turbine hubs, bases, gearbox housings.

Rail transit: Locomotive couplings, bogie components.

General machinery: compressor crankshafts, flywheels, various industrial gears and transmission components.

Our services

We not only offer standard grade castings, but also provide material selection suggestions, structural optimization design support and customized heat treatment solutions based on your specific working conditions, force analysis and performance requirements, ensuring that you obtain the most optimized solution in terms of performance and cost.

Choosing our ductile iron castings means choosing reliable quality, outstanding performance and professional engineering support.