Wear resistant low alloy white cast iron

Details Wear resistant low alloy white cast iron Wear resistant low alloy white cast iron

C - Chemistry, Metallurgy

22

C

148/11, 75/124

C22C 37/10 (2006.01) C21D 5/04 (2006.01) C22C 37/00 (2006.01)

Patent

CA 1052599

ABSTRACT OF THE DISCLOSURE: A low alloy white cast iron has been developed for wear resistance applications. The alloy consists essentially of about 2 to 4% carbon, 0.3 to 1.2% silicon, 0.5 to 1.5% manganese, 0.5 to 1.5% copper and 0.25 to 1% molybdenum, the remainder being sub- stantially iron except for incidental impurities commonly found in cast iron. The preferred alloy composition is 2.5 to 3% carbon, 0.6 to 0.9% silicon, about 1% manganese, about 1% copper and about 0.5% molybdenum, the rest being substantially iron. The process for manufacturing the above wear resistant alloy consists in melt- ing an alloy having the composition mentioned above, casting such alloy into moulds to produce a desired product such as grinding balls or slugs, shaking the product out of the moulds at a temper- ature of 750°C or higher, preferably about 900°C and cooling the product at a rate of 2 to 15°C/sec., preferably 5 to 10°C/sec. The as-cast product is preferably heat treated at a temperature between 200 and 400°C, preferably about 260°C for a time of 1 to 8 hours, preferably about 4 hours to transform as much retained austenite as possible into martensite.

261107

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