| 摘要 |
PURPOSE:To manufacture a stainless steel stock excellent in strength and rust resistance by subjecting a hot worked stock or cold worked stock of a stainless steel having a specified composition with relatively high carbon content to heat treatment under specified conditions and then to cold working or further to aging treatment. CONSTITUTION:A hot worked stock or cold worked stock of a stainless steel which contains, by weight, 0.10-0.30% C, 0.10-2.0% Si, 5-12% Mn, <=0.006% S, <=4% Ni, 15-22% Cr, 0.10-3% Mo, <=0.01% O, 0.1-0.4% N, and 0.0001-0.01% Ca and in which the value of Md30 represented by an equation I as an index to the stability of austenite is regulated to >-120 and also the value of PV represented by an equation II as an index to hot workability is regulated to <0 is annealed at 1,000-1,200 deg.C. Subsequently, the above stock is cooled at >=5 deg.C/sec cooling rate and then subjected to final cold working or further to aging treatment at 300-700 deg.C after the above final cold working. By this method, the stainless steel stock having high strength and excellent in rust resistance can be obtained. |
