| 摘要 |
PROBLEM TO BE SOLVED: To provide austenitic high-Mn stainless steel which is originated to obtain austenitic stainless steel having excellent resistance to hydrogen embrittlement susceptibility higher than that of SUS316 series and which can maintain the resistance to hydrogen embrittlement susceptibility higher than that of SUS316L and can be adapted to use in low-temperature hydrogen environments by performing the design of composition in such a way that Mn and [-120<Md30<20] satisfy specific conditions, respectively. SOLUTION: The austenitic high-Mn stainless steel has a composition consisting of, by mass, 0.01 to 0.10% C, 0.01 to 0.40% N, 0.1 to 1% Si, 10 to 20% Cr, 6 to 20% Mn, 2 to 5% Cu, 1 to 6% Ni and the balance Fe with inevitable impurities. In the steel, the design of composition is carried out so that the austenite stability index Md30, represented by [Md30=497-462(C+N)-9.2Si-8.1Mn-13.7Cr-20(Ni+Cu)-18.5Mo], satisfies [-120<Md30<20]. COPYRIGHT: (C)2007,JPO&INPIT |
