| 摘要 |
The disclosed martensitic stainless steel includes, in terms of mass%, 0.003-0.03% C, 0.01-1.0% Si, 3.0-6.0% Mn, at most 0.05% P, at most 0.003% S, 1.0-3.0% Ni, 15.0-18.0% Cr, 0.0-1.0% Mo, 0.0-2.0% Cu, 0.0-0.05% Ti, at most 0.05% N, 0.001-0.1% Al and at most 0.005% O, with the remainder being Fe and unavoidable impurities, wherein the total content of C and N is at most 0.060%, max in equation (1) is at least 80, and pot in equation (2) is in the range of 60-90, inclusive. Equation (1): max = 420 X C% + 470 X N% + 23 X Ni% + 9 X Cu% + 7 X Mn% - 11.5 X Cr% - 11.5 X Si% - 52 X Al% + 189. Equation (2): pot = 700 X C% + 800 X N% + 10 X (Mn% + Cu%) + 20 X Ni% - 9.3 X Si% - 6.2 X Cr% - 9.3 X Mo% - 74.4 X Ti% - 37.2 X Al% + 63.2. Therein, C%, N%, Ni%, Cu%, Mn%, Cr%, Si%, Al%, Mo% and Ti% represent the content (in mass%) of the respective elements.
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