AUSTENITE HIGH-MANGANESE STAINLESS STEEL, MANUFACTURING METHOD THEREFOR, AND MEMBER USING SAID STEEL

摘要

Inexpensive stainless steel and inexpensive and high strength stainless steel which has excellent hydrogen environment embrittlement resistance even if used in a hydrogen resistant environment in over 40 MPa high pressure hydrogen gas or a hydrogen resistant environment in liquid hydrogen, characterized by containing, by mass%, C: 0.1% or less, Si: 0.4 to 1.5%, Mn: 8 to 11%, Cr: 15 to 17%, Ni: 5 to 8%, Cu: 1 to 4%, and N: 0.01 to less than 0.15% and having a balance of Fe and unavoidable impurities, having a volume rate of ´-ferrite of 10% or less, and having a long axis of ´-ferrite before annealing of 0.04 to 0.1 mm.