Steel sheets and strips

Details Steel sheets and strips Steel sheets and strips

C - Chemistry, Metallurgy

21

D

148/32

C21D 8/00 (2006.01) C21D 8/02 (2006.01) C23C 8/80 (2006.01) C21D 1/18 (2006.01)

Patent

CA 1049906

ABSTRACT OF THE DISCLOSURE: A medium-hard to hard thin steel sheet and a strip cut or stamped therefrom, both having an increased fatigue strength, are prepared by cold rolling a soft steel sheet, carburizing or carbo-nitriding the soft thinned sheet until a medium-hard to hard thin steel sheet is obtained and subjecting the resulting sheet or strip cut or stamped therefrom to a three- part heat treatment, which heat treatment involves first and second different austenizing operations, each followed by an identical two-step cooling operation, and a third lesser reheating and cooling operation.

252871

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