Spheroidal graphite cast iron - is produced by adding solid cast iron of high magnesium content to the iron melt

摘要

Spheroidal graphite cast iron is produced by melting an Fe charge having a C content >2 wt % and adding solid cast iron which contains a spheroidal graphite-forming element such as Mg and/or Ce in 4-10 times the amt. necessary to form spheroidal graphite in the final cast iron product. The solid cast iron may be added in the form of scrap of normal spheroidal graphite content together with casting risers and gates. Method is simple and reduces losses in spheroidal graphite forming elements while at the same time utilising cast iron scrap.