| 摘要 |
A stainless steel sheet suitable for precision machining, which comprises, in mass%, C <= 0.030%, Si <= 0.80%, Mn <= 1.20%, P <= 0.045%, S <= 0.01%, Cu <= 0.60%, Mo <= 0.60%, Al <= 0.02%, 18.0% <= Cr <= 19.0%, 8.0% <= Ni <= 9.0%, 0.03% < Nb <= 0.12%, 0.02% <= N <= 0.1% and a remainder made up by iron and impurities, wherein the Md30 value as defined by formula (1) is 25 to 55, and the average crystal grain diameter is 5 mum or less. Formula (1): Md30 = 497-462(C+N)-9.2(Si)-8.1(Mn)-13.7(Cr)-20(Ni+Cu)-18.5(Mo) In formula (1), C, N, Si, Mn, Cr, Ni, Cu and Mo respectively represent the contents (unit: mass%) of the corresponding elements in the steel. |
