Wear resistant low alloy white cast iron

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

1978-05-16

1980-03-25

Steiner, Arthur J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75123CB, 148 35, C22C 3710

Patent

active

041949064

ABSTRACT:
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 1.5% silicon, 0.5 to 1.5% manganese, 0.5 to 1.5% copper and 0.25 to 1% molybdenum, the remainder being substantially 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 melting 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 temperature of 750.degree. C. or higher, preferably about 900.degree. C. and cooling the product at a rate of 2.degree. to 15.degree. C./sec., preferably 5.degree. to 10.degree. C./sec. The as-cast product is preferably heat treated at a temperature between 200.degree. and 400.degree. C., preferably about 260.degree. C. for a time of 1 to 8 hours, preferably about 4 hours to increase the hardness thereof.

REFERENCES:
patent: 3623922 (1971-11-01), Williams et al.
patent: 3695865 (1972-10-01), Wolker
"Cast Metals Handbook," AFS 1944, pp. 558, 573.

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