CPC C21D 7/13 (2013.01) [C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/007 (2013.01); C21D 6/008 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/44 (2013.01); C22C 38/50 (2013.01); C22C 38/52 (2013.01); C21D 2211/001 (2013.01); C21D 2211/008 (2013.01)] | 20 Claims |
1. A method for heat processing a stainless steel comprising:
13 to 14 wt % chromium (Cr);
5.5 to 7.0 wt % nickel (Ni);
5.5 to 7.5 wt % cobalt (Co);
3 to 5 wt % molybdenum (Mo);
1.9 to 2.5 wt % titanium (Ti); and
iron (Fe), the method comprising:
forging the stainless steel in austenite phase region, with a forging ratio of 6-9, and air cooling to room temperature after forging; and
hot-rolling the stainless steel after forging, with a starting temperature of 1150-1250° C., and a finishing temperature of at least 900° C., and air cooling after hot-rolling.
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