SI-N STRENGTHENED AUSTENITE STAINLESS STEEL WITH SUPERIOR SEAWATER RESISTANCE

摘要

PURPOSE:To obtain a stainless steel with superior seawater resistance by preparing a steel contg. a specified percentage of C, Si, Mn, Ni, Cr, No and N and having regulated Cr equiv. CONSTITUTION:A stainless steel consisting of, by wt., =0.08% C, 1.10-1.90% Si, 5.6-10.0% Mn, 8.6-17.0% Ni, 20.5-30.0% Cr, 0.2-4.0% Mo, 0.25-0.50% N and the balance Fe with impurity elements and having =31 Cr equiv. represented by Cr+2.5Mo+0.4Ni+20N is prepared. To the steel may be added 0.2-0.3% Cu and one or more among =0.05% Ce, =0.02% Ca, =0.05% misch metal and =0.01% B. Thus, a seawater-resistant high-strength austenite stainless steel with superior resistances to stress corrosion cracking, wear and seizing is obtd.