HIGH-PURITY AND HIGH-CLEANLINESS STAINLESS STEEL EXCELLENT IN CREVICE CORROSION RESISTANCE AND RUST RESISTANCE AND ITS PRODUCTION

摘要

PURPOSE:To obtain a high-purity and high-cleanliness stainless steel excellent in crevice corrosion resistance and rust resistance by subjecting a molten steel which has a prescribed composition and in which cleanliness consisting of the sum of oxide-type inclusions and sulfide-type inclusions is regulated to a specific value or below to continuous casting under the prescribed temp. conditions and then to hot rolling. CONSTITUTION:A molten steel which has a composition containing, by weight, 0.01-0.1% C, =3% Si, =2% Mn, 14-26% Cr, 0.005-0.2% N, =0.02% P, 0.001% S, 0.02-0.2% Al, 0.003% O, further one or more kinds among =3% Mo, =2% Cu, and =2% Ni, and =0.01% B and in which cleanliness consisting of the sum of oxide-type inclusions and sulfide-type inclusions is regulated to =0.02% is continuously cast under the temp. condition in which T is regulated to =45 deg.C, and the resulting cast slab is heated to or held at =1230 deg.C, followed by hot rolling. By this method, an inexpensive ferritic stainless steel having superior workability as well as the above properties can be obtained.