Method of making ductile cast iron with improved strength

Details Method of making ductile cast iron with improved strength Method of making ductile cast iron with improved strength

C - Chemistry, Metallurgy

22

C

148/11, 75/118

C22C 33/08 (2006.01) C21D 5/02 (2006.01) C22C 37/04 (2006.01)

Patent

CA 1224066

- 11 - ABSTRACT A method of making ductile cast iron with a matrix of acicular ferrite and bainite is disclosed. A melt by weight of 3.0-3.6% carbon, 3.5-5.0% silicon, .7-5.0% nickel, 0-.3% Mo, > .015% S, > .06% P (remainder Fe) is subjected to a nodularizing agent and solidified. The iron is then heat treated by heating to 1575-1650°F for 1-3 hours, quenched to 400-775°F at a rate of at least 275°F/min., held for .5-4 hours, and cooled to room temperature. The resulting ductile iron exhibits a yield strength of at least 80 ksi, a tensile strength of at least 140 ksi, elongation of at least 6%, and a hardness of at least 270 BHN.

445099

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