AUSTENITIC STAINLESS STEEL MATERIAL, METHOD FOR PRODUCING SAME, AND DEVICE FOR HYDROGEN

WIPO Patent Application WO/2022/255437

A1

This austenitic stainless steel material has a chemical composition comprising, by mass%, 0.20% or less of C, 2.0% or less of Si, 6.0-20.0% of Mn, 0.060% or less of P, 0.0080% or less of S, 10.0-18.0% of Cr, 4.0-12.0% of Ni, 0.01-0.30% of N, 4.0% or less of Cu, 3.0% or less of Mo, optional elements, and a balance being Fe and impurities, a value of A is 30.0-60.0, and, in the metal structure of a surface layer, the high-angle grain boundary ratio Gs satisfies [0.1