| 摘要 |
PURPOSE:To obtain an austenitic stainless steel for use at high temp. having superior creep rupture strength by restricting the amount of P in a steel to a proper range and further restricting the amounts of Ti and Nb. CONSTITUTION:The composition of an austenitic stainless steel is composed of, by weight, 0.05-0.15% C, <1% Si, <2% Mn, 7-18% Ni, 15-25% Cr, <0.03% T, N, 0.02-0.08% P, <0.5% Ti and/or <1% Nb and the balance Fe with inevitable impurities. The composition may further contain <0.01% B and/or <0.1% Zr. In the composition, the atomic ratio of (Ti+Nb)/C is 0.2-0.8.
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