Method of making cg iron

Details Method of making cg iron Method of making cg iron

C - Chemistry, Metallurgy

21

D

148/11

C21D 5/02 (2006.01) B21B 1/22 (2006.01) C21C 1/08 (2006.01) C21D 8/02 (2006.01) C22C 33/00 (2006.01) C22C 33/08 (2006.01) C22C 33/10 (2006.01) B21B 1/36 (2006.01)

Patent

CA 1229777

-13- ABSTRACT A method is disclosed for making compacted graphite cast iron of improved strength and hardness while retaining excellent thermal conductivity, low shrinkage, and excellent damping characteristics. A ferrous alloy is melted consisting essentially of, by weight, 3-4% C, 2-3% Si, .2-.7% Mn, .25-.4 Mo, .5-3.0% Ni, up to .002% sulfur, up to .02% phosphorus, and im- purities or contaminants up to 1.0%, with the remainder being essentially iron. The melt is subjected to a graphite modifying agent to form compacted graphite upon solidification. The solidified casting is heat treated by austempering and quenching to produce an iron having a matrix of bainite and austenite.

483571

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