C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
53/36
C22C 33/08 (2006.01) C21C 1/08 (2006.01) C22C 33/10 (2006.01) C22C 37/04 (2006.01)
Patent
CA 1214044
PROCESSES FOR PRODUCING AND CASTING DUCTILE AND COMPACTED GRAPHITE CAST IRONS Abstract of the Disclosure The present invention is directed to processes and apparatus for carrying out said processes wherein molten cast iron is treated with a predominately iron alloy having the essential elements by weight of from about 0.1 to about 10.0% silicon and about 0.5 to about 4.0% magnesium. The alloy may comprise from about 0.1 to about 10.0% silicon, about 0.5 to about 4.0% magnesium, up to about 2.0% of one or more rare earth elements such as cerium about 0.5 to about 6.5% carbon, the balance being iron. Small amounts of calcium, barium or strontium and trace elements customarily found in conventional raw material may be present in the alloy. The characteristics of the alloy make it possible to establish a ready supply of treated molten iron in the foundry in holding vessels with a selected chemical composition at a given temperature. It also makes possible semi-continuous and continuous casting of ductile and compacted graphite cast irons.
424043
Elkem Metals Company
Macrae & Co.
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