High Mn austenitic stainless steel for weldability, weld joints and devices for hydrogen, and methods for producing weld joints

摘要

The austenitic stainless steel is, in mass%, C: 0.3% or less, Si: 0.1 to 1.5%, Mn: 5.5 to 20%, P: 0.050% or less, S: 0.005% or less, Cr: 10 to 20%. , Ni: 4.0 to 12%, N: 0.40% or less, Cu: 4.0% or less, O: 0.02% or less, Ca: 0.01% or less, Al: 0.3% or less, and either or both It consists of addition Fe and an unavoidable impurity, and satisfy | fills following formula (1). [Ni] + [Cu] +12.93 [C] +1.11 [Mn] +0.72 [Cr] +0.88 [Mo] -0.27 [Si] +7.55 [N] ≥29.3