Nodular iron

The round shape of nodular graphite reduces the stress concentration and consequently, the material is much more ductile than grey iron. Nodular iron is normally used for pump parts with high strength requirements

Nodular iron contains around 0.03-0.05% by weight of magnesium. Magnesium causes the flakes to become globular so the graphite is dispersed throughout a ferrite or pearlite matrix in the form of spheres or nodules. The graphite nodules have no sharp features. The round shape of nodular graphite reduces the stress concentration and consequently, the material is much more ductile than grey iron. Nodular iron is normally used for pump parts with high strength requirements (high pressure or high temperature applications).





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