Patent ID: 6918968

Claim:
An austenitic stainless steel characterized by consisting of, by mass %, C: more than 0.05% to 0.15%, Si: 2% or less, Mn: 0.1 to 3%, P: 0.04% or less, S: 0.01% or less, Cr: more than 20% to less than 28%, Ni: more than 15% to 55%, Cu: more than 2% to 6%, Nb: 0.1 to 0.8%, V: 0.02 to 1.5%, sol.Al: 0.001 to 0.1%, N: more than 0.05% to 0.3% and O (Oxygen): 0.006% or less, and the balance Fe and impurities, further characterized by satisfying the following formulas (1) and (2): P≦1/(11×Cu) (1) sol.Al≦0.4×N (2) wherein each element symbol in the formulas (1) and (2) represents the content (mass %) of each element.