Production method of overhang strength and toughness to the excellent high-strength stainless steel

摘要

PURPOSE:To manufacture a high strength stainless steel having superior bulging strength and toughness by cold working and aging an austenitic stainless steel having a specified compsn. under specified conditions. CONSTITUTION:A steel consisting of, by weight, =0.10% C, 1.0-3.0% Si, =2.5% Mn, 4.0-8.0% Ni, 12.0-18.0$ Cr, 1.0-3.5% Cu, =0.15% N (C+N=0.10%), =0.008% S and the balance Fe with inevitable impurities is subjected to soln. heat treatment. The resulting stainless steel having an austenite structure is cold worked at about 70% working rate so as to regulate the amt. of martensite produced by the working to 40-80vol.% and the steel is aged at 400-600 deg.C for a short time of 0.3-5min. Thus, a high strength stainless steel having =180kg/mm2 strength is obtd.