Production process of ductile iron
Malleable Iron Pipe Fittings Manufacturer shares that pure magnesium, nickel-magnesium, ferrosilicon or ferrosilicon rare-earth magnesium alloys were added as spheroidizing agents to the molten iron with slightly higher content of carbon and silicon and low content of sulfur and phosphorus, and then inoculated with ferrosilicon, calcium silicate or other multi-element alloys to obtain ductile cast iron in the as-cast state. To further improve its mechanical properties, ductile iron can be subjected to various heat treatments, such as annealing, normalizing, tempering, or isothermal quenching. The microstructure of nodular cast iron is different from that of nodular graphite, depending on the chemical composition, solidification rate and heat treatment specification. Ferrite ductile iron with low tensile strength and high elongation; There are pearlitic ductile iron with high tensile strength and low elongation, and bainite and austenite - bainite ductile iron with excellent tensile strength and elongation. China is rich in rare earth metals and ductile iron has become a widely used structural material.
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