Method for producing high strength steel excellent in...

Details Method for producing high strength steel excellent in... Method for producing high strength steel excellent in...

C - Chemistry, Metallurgy

21

D

148/31

C21D 8/02 (2006.01) C21D 8/00 (2006.01)

Patent

CA 1253055

ABSTRACT OF THE DISCLOSURE A steel which is excellent in mechanical properties after a warm working process is produced by specifying a chemical composition as claimed, subjecting the steel to a controlled rolling under conditions at temperatures of not more than 900°C and accumulated reduction of more than 30%, leaving it, after the controlled rolling, as it is in the air or performing it to an accelerated cooling wherein the steel is cooled at rate between the air cooling and 100°C/sec until temperatures where a transformation finishes, subsequently reheating the steel to ranges between 400°C and 750°C, and carrying out the warm work- ing thereon instantaneously or after the air cooling at the temperatures between 250°C and 750°C.

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