TWO-PHASE CAST STAINLESS STEEL HAVING HIGH CORROSION RESISTANT AND HIGH FATIQUE STRENGTH

摘要

PURPOSE:To provide the titled cast steel having high yield strength and high corrosion resistance in corrosive environment, obtained by a method wherein a composition comprising C, Si, Mn, Cr, Ni, Mo, Cu, Co, V, Fe or the like is limitted and, according to necessity, Nb, Ta or Ti are contained. CONSTITUTION:Stainless cast steel containing 0.1% or less C, 2.0% or less Si, 2.0% or less Mn, 22.0-27.0% Cr, 5.0-9.0% Ni, 1.1-2.5% Mo, 0.5-2.5% Cu, 0.5-2.0% Co, 0.5-2.0% V and, according to necessity, further containing one kind or more of 0.05-1.0% Nb, 0.05-1.0% Ta and 0.01-0.5% Ti and comprising the remainder Fe and inevitable impurities forms a ferrite-austenite two- phase structure in a proper ratio by the balance of Cr and Ni contents and has high yield strength, high corrosion resistance and excellent corrosion fatique strength in a corrosive environment containing a chlorine ion or the like.