MANUFACTURE OF AUSTENITIC STAINLESS STEEL HAVING SUPERIOR CRYOGENIC CHARACTERISTIC AFTER HEAT TREATMENT FOR FORMING NB3SN

摘要

PURPOSE:To manufacture an austenitic stainless steel having superior cryogenic characteristics after heat treatment for forming Nb3Sn by subjecting a steel ingot having a specified compsn. to hot rolling, soln. heat treatment at a speci fied temp. and further heating to a specified temp. CONSTITUTION:A steel ingot or slab consisting of, by weight, =0.03% C, 0.1-2.0% Si, 0.1-20.0% Mn, =0.025% P, =0.015% S, 3-15% Ni, 12-20% Cr, 0.5-2.5% Mo, 0.01-0.18% Nb, 0.05-0.25% N and the balance Fe with inevitable impurities and satisfying a formula Ni+0.5Mn+30C+30N2/3(Cr+Mo+Si-8) is hot rolled or hot rolled and cold rolled, subjected to soln. heat treatment at 1,000-1,150 deg.C and further heated to 820-900 deg.C.