Ductile iron, also called spheroidal graphite iron, is a kind of cast iron alloy. Its carbon structure is nodule graphite, which is different from grey cast iron that has flake form graphite. This special structure brings excellent ductility and good impact, heat, and wear resistance to ductile iron. In addition, it has steel-similar performance but it costs lower than steel. It is widely used in pipe and valve manufacturing because of these advantages.

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