| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonmagnetic steel which is inexpensive and has excellent nonmagnetic properties. SOLUTION: The nonmagnetic steel has a composition comprising, by mass, 0.5 to 0.8% C, 0.5 to 1.0% Si, 8 to 14.6% Mn, ≤0.030% (not including 0%) P, ≤0.030% (not including 0%) S, ≤0.1% (not including 0%) Cu, ≤0.1% (not including 0%) Ni, 1.8 to 3.0% Cr, 0.005 to 0.1% Al and 0.004 to 0.1% N, and in which inequalities (1) to (3) are satisfied, and the balance iron with inevitable impurities, and has a microstructure made of an austenitic structure, and in which magnetic permeability is ≤1.030; (1): [Mn]+34×[C]≤40, (2): FB≥-0.78×FA+27 and (3): FB≥1.2×FA-9.6, wherein FA=[Cr]+1.5×[Si], FB=[Ni]+30×[C]+0.5×[Mn]. and [ ] denotes the content (mass%) of each element. COPYRIGHT: (C)2011,JPO&INPIT |
