Gray cast iron having both increased wear resistance and...

Details Gray cast iron having both increased wear resistance and... Gray cast iron having both increased wear resistance and...

C - Chemistry, Metallurgy

21

D

148/48.2

C21D 5/00 (2006.01) C22C 37/00 (2006.01)

Patent

CA 1311993

-14- Abstract of the Disclosure A method is disclosed for making gray iron having both increased wear resistance and impact toughness, comprising: (a) solidifying a hypoeutectic gray iron melt (i) to which has been added a carbide forming agent in an amount of .3-.8% by weight, selected from the group consisting of Ti, V and Mo, and, advantageously, a high carbon austenite-ferrite forming agent in an amount of .5-3.0%, by weight, selected from the group consisting of nickel and copper, and at a solidification rate to form a matrix with a mixture of flake graphite and eutectic carbide suspended in the matrix; and (b) heat treating the solid by (i) heating to a temperature and for a period of time to fully austenitize the solid (ii) quenching the solid to a temperature level and for a period of time to decompose austenite to form and high carbon austenite and ferrite matrix and (iii) air cooling the solid to room temperature. The hypoeutectic gray iron contains less than 4.35% carbon equivalent and preferably comprises, by weight, 2.5-3.0% carbon, 2.0-2.5% silicon, .5-.90% manganese, and the remainder iron.

553034

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