| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydrogen embrittlement-resistant high strength austenitic alloy in which high strength and hydrogen embrittlement resistance are made compatible. SOLUTION: The hydrogen embrittlement-resistant high strength austenitic alloy has a composition comprising, by mass, 0.01 to 0.10% C, 0.01 to 0.8% Si, 0.01 to 0.8% Mn, 14 to 17% Cr, 3.5 to 5.0% Mo, 1.6 to 2.5 Al, 1.5 to 3.0% Ti, 0.5 to 2.0% Nb, 50 to 60% Ni, 0.001 to 0.015% B and 0.001 to 0.015% Mg, and the balance Fe with impurities, and in which, by atomic%, the following A value is 2.0 to 4.0, the following B value is 0.5 to 0.6 and the following C value is 6.4 to 7.6, and in which tensile strength at room temperature is≥1,180 MPa, and elongation is≥19%: A value 0.293[Ni]-0.513[Cr]-1.814[Mo], B value [Al]/([Al]+[Ti]+[Nb]), and C value [Al]+[Ti]+[Nb]; [ ] denotes atomic%. COPYRIGHT: (C)2011,JPO&INPIT |
