Production of vermicular graphite cast iron

Details Production of vermicular graphite cast iron Production of vermicular graphite cast iron

C - Chemistry, Metallurgy

22

C

53/34, 53/97

C22C 33/00 (2006.01) C21C 1/08 (2006.01) C22C 33/08 (2006.01) C22C 37/00 (2006.01)

Patent

CA 1157277

FS 1143 A B S T R A C T Vermicular graphite cast iron is produced by adding to molten iron simultaneously up to 0.3% by weight of the iron of one or more rare earth metals and in excess of 0.2% by weight of the iron of calcium, the quantity of rare earth metal being within the range of 2 to 8 times the sulphur content of the molten iron. The rare earth may be added for example as cerium, mischmetall or as rare earth silicide. The calcium may be added for example as calcium metal or as calcium silicide or a nickel-calcium alloy. An alloy containing both rare earth and calcium, such as a calcium-cerium-silicon alloy, or a composition containing rare earth, calcium and a fluxing agent may also be used.

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