Method for softening rolled medium carbon machine structural...

Details Method for softening rolled medium carbon machine structural... Method for softening rolled medium carbon machine structural...

C - Chemistry, Metallurgy

21

D

148/33

C21D 8/00 (2006.01) C21D 1/32 (2006.01) C22C 38/18 (2006.01)

Patent

CA 1276095

ABSTRACT A method of softening a rolled medium carbon machine structural steel is provided. This method is characterized by: (1) hot rolling a steel containing 0.32 - 0.65% C, less than 0.05% Si, 0.3 - 0.9% in total of Mn and Cr, with the Mn and Cr contents being 0.2 - 0.5% and 0.1 - 0.5%, respectively, 0.005 - 0.1% Al, less than 0.02% P and less than 0.02% S, all percents being on a weight basis, and the balance being Fe and incidental impurities; and (2) performing either one of the following softening treatments: (i) slowly cooling the hot rolled steel from 750°C until transformation to pearlite is completed at a cooling rate of 3 - 30°C/min; or (ii) immediately quenching the hot rolled steel to a temperature within the range of 670 - 720°C, holding the steel in this temperature range for 4 - 60 minutes, and air-cooling the steel.

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