PRODUCTION OF AUSTENITIC STAINLESS STEEL HAVING EXCELLENT SEAWATER CORROSION RESISTANCE

摘要

PURPOSE:To produce the titled high-alloy stainless steel by subjecting the continuous-coasting slab of an austenitic stainless steel having specific compsn. to soaking treatment, hot rolling and cooling under specific conditions. CONSTITUTION:The continuous cast slab of the austenitic stainless steel contg., by weight, 0.005-0.3% C, =5% Si, =8% Mn, =0.04% P, 15-35% Cr, 10-40% Ni, 4.5-13% Mo, =30ppm S, =70ppm O, 0.001-0.1% Al and 0.01-0.5% N, contg. one or more kinds among 0.001-0.008% Ca, =3% Cu, =1% Nb, =1% V, =2% W, =0.5% Zr, and =0.5% Sn as selective components and consisting substantially of the balance Fe with inevitable impurities is subjected to a soaking treatment in the range of the shadowed portion shown by the figure. The slab undergone =2hr total soaking time with the soaking time in said temp. range before rolling is then hot rolled, is furthermore annealed at =1,100 deg.C and is thereafter cooled by water from the temp. range of =900 deg.C.