Ductile Iron Castings

Mar. 04, 2021

Ductile Iron Castings

Whether you have a design suitable for casting, or you need a custom casting design, we can help. We have the ability to produce cast iron parts for you from start to finish.

What is ductile iron?

Ductile iron is a kind of cast iron with high strength, high toughness, and high wear resistance. Due to the spherical (spherical) graphite in the metal, it has the ability to resist impact, elongation, and daily wear.

Advantages of ductile iron castings

Ductile iron castings combine processing advantages such as low melting point, good fluidity, and good workability. It also has many engineering steel advancements, including high strength, ductility, and wear resistance. These characteristics allow for higher tensile and yield strength and lower damping capacity.

The microstructure of Ductile Iron Castings

Ductile iron, also known as nodular cast iron or nodular cast iron, has an unusual combination of properties because graphite is spherical rather than flake like gray cast iron. This solidification method is obtained by adding a small but certain amount of magnesium to the molten iron. The allowable content of trace elements that affect the formation of graphite balls in the parent iron is strictly limited. The added magnesium reacts with the sulfur and oxygen in the molten iron, changing the way graphite is formed.

Tensile and yield strength

The minimum tensile strength of ductile cast iron is 60,000 psi, and the minimum yield strength is 40,000 psi. The general properties of ductile iron are tensile strength, yield strength, and elongation. Due to the influence of the nominality and consistency of nodular graphite, the tensile properties of nodular cast iron have a good correlation with Brinell hardness.

Low damping capacity

The relative ability of a material to absorb vibration is evaluated as to its damping ability. Suppress vibration by converting mechanical energy into heat energy, which is very important in structures and equipment with moving parts. The relative damping capacity of spheroidal graphite cast iron is 0.14, which is significantly lower than the damping capacity of similar gray cast iron parts, which is 1. Nevertheless, ductile iron is superior to steel alloys in terms of damping capacity.

Most suitable for ductile iron castings

Due to their increased strength and ductility, these types of castings are most suitable for:

Body of value

Compressor valve


Sprocket wheels

Hydraulic valve and hydraulic cylinder

Structural support


Cable drum





Exhaust gas recirculation system

Machine frame




We are ductile iron castings suppliers. If you are interested in our products, please feel free to contact us.

Ductile Iron Castings