Ductile iron invented in 1943 has graphite as spheroids, so it is sometimes referred to as spheroidal graphite. Similarly, the term nodular iron came from the fact that the carbon contained in ductile iron is held in the form of nodules. This unique microstructure causes ductile iron to withstand bending and shock loading far better than traditional cast iron.

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Ductile  iron can be produced from steel or iron scrap and pig iron is the primary source for modern ductile iron foundries. Pig iron refers to the primary iron production of a blast furnace that contains over ninety percent iron.

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In TEM, Pig iron is mainly used in production as it contains low residual or harmful elements, has a consistent chemistry, promotes optimal slag conditions, and improves process control by providing consistent charge properties. Pig iron has advantage over alternate iron sources such as iron scrap, or melting steel scrap and adding carbon.

There are many different ductile iron specifications, TEM offer different grades for different applications.

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Ductile iron has greater strength and ductility than grey iron. Those properties allow it to be used effectively in a wide variety of industrial applications, including access cover, pipe, automotive components, wheels, gear boxes, pump housings and many more.