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In this research, the spheroidal graphite cast iron melt was produced by using 7 kinds of steel scraps, the shredder scrap, the surface treated steel sheets, the magnetic steel sheets, the high strength steel and others. The influences of the steel scraps on microstructures and mechanical properties were studied. Zinc, chromium, antimony, nickel, aluminum and manganese were contained in the steel scraps respectively. Using the steel scrap of the used car (shredder scrap), zinc is contained in the iron castings. The antimony included in the magnetic steel sheet was found to be a powerful pearlite stabilizer. The tensile strength and the hardness of cast iron increased with the increasing pearlite percent. Also chromium included in the surface treated steel sheet and manganese in the high strength steel increase the pearlite in the matrix of cast iron.

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