| 摘要 |
This martensitic stainless steel contains, in terms of percent by mass: C: 0.003% to 0.03%; Si: 0.01% to 1.0%; Mn: 3.0% to 6.0%; P: 0.05% or less; S: 0.003% or less; Ni: 1.0% to 3.0%; Cr: 15.0% to 18.0%; Mo: 0% to 1.0%; Cu: 0% to 2.0%; Ti: 0% to 0.05%; N: 0.05% or less; Al: 0.001% to 0.1%; and O: 0.005% or less, with a remainder being Fe and inevitable impurities, wherein a total amount of C and N is in a range of 0.060% or less, γmax represented by the formula 1 is in a range of 80 or more, and γpot represented by the formula 2 is in a range of 60 to 90. γmax=420×C %+470×N %+23×Ni %+9×Cu %+7×Mn %−11.5×Cr %−11.5×Si %−52×Al %+189  Formula 1 γpot=700×C %+800×N %+10×(Mn %+Cu %)+20×Ni %−9.3×Si %−6.2×Cr %−9.3×Mo %−74.4×Ti %−37.2×Al %+63.2  Formula 2 Here, C %, N %, Ni %, Cu %, Mn %, Cr %, Si %, A1%, Mo %, and Ti % represent the contents (mass %) of the respective elements.
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