PURPOSE: To provide an austenitic stainless steel which not only improves creep strength and creep rupture ductility, but also substantially improves hot workability, particularly ductility at a high temperature of 1200 deg.C or more. CONSTITUTION: The austenitic stainless steel comprises more than 0.05 mass% to not more than 0.15 mass% of C, 2 mass% or less of Si, 0.1 to 3 mass% of Mn, 0.04 mass% or less of P, 0.01 mass% or less of S, more than 20 mass% to less than 28 mass% of Cr, more than 15 mass% to not more than 55 mass% of Ni, more than 2 mass% to not more than 6 mass% of Cu, 0.1 to 0.8 mass% of Nb, 0.02 to 1.5 mass% of V, 0.001 to 0.1 mass% of soluble Al, more than 0.05 mass% to not more than 0.3 mass% of N, 0.006 mass% or less of O, and the balance of Fe and impurities and satisfies the following expressions 1 to 3: £Expression 1|P=1/(11xCu), £Expression 2|Soluble Al=0.4xN, £Expression 3|O=1/(60xCu) where each element symbol in the expressions 1 to 3 means the content(mass%) of each element.
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机译：目的：提供一种奥氏体不锈钢，它不仅可以提高蠕变强度和蠕变断裂延展性，而且还可以显着提高热加工性，特别是在1200℃或更高的高温下的延展性。组成：奥氏体不锈钢包含大于等于0.05质量％至小于等于0.15质量％的C，小于等于2质量％的Si，小于等于0.1质量％的Mn，小于等于0.04质量％的P，小于等于0.01质量％ S的不足，Cr的20质量％以上至28质量％以下，Ni的15质量％以上至55质量％以下，Cu的2质量％以上至6质量％以下，0.1以上。 Nb为0.8质量％，V为0.02〜1.5质量％，可溶性Al为0.001〜0.1质量％，N为0.05质量％以上0.3质量％以下，O为0.006质量％以下，其余为Fe和杂质并满足以下表达式1至3：£表达式1 | P <= 1 /（11xCu），£表达式2 |可溶性Al <= 0.4xN，£表达式3 | O <= 1 /（60xCu），其中每个表达式1至3中的元素符号表示每个元素的含量（质量％）。
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