PRODUCTION OF TWO PHASE STAINLESS CAST STEEL PRODUCT OF HIGH CR AND LOW NI HAVING EXCELLENT SEA WATER RESISTANCE

摘要

PURPOSE:To suppress efficiently the deposition of a sigmaphase and to produce stably a cast steel product having excellent sea water resistance by charging a molten high Cr low Ni stainless steel having a specific component compsn. into a casting mold, knocking out the mold at a specific temp. after solidification and cooling quickly the steel. CONSTITUTION:A molten high Cr low Ni stainless steel contg., by wt%, =0.05% C, =2.0% Si, =2.0% Mn, 22.0-30.0% Cr, 4.0-11.0% Ni, 0.5-5.0% Mo, 0.10- 0.60% Cu, =0.04% P, =0.03% S, = N, and further contg. 1 kind of 0.05- 1.50% W or 0.05-1.50% V, and consisting of the balance Fe with inevitable impurities is charged into a casting mold and is solidified. The mold is knocked out while the molten steel is in the high temp. state before cooling down to a temp. region of 1,000 deg.C and the steel is immediately and quickly cooled. The two phase stainless cast steel product having excellent sea water resistance is thus mass-produced easily at a low cost.