| 摘要 |
[Problem] To reduce the anisotropy of a martensitic stainless-steel sheet in processability and fatigue resistance which is attributable to oxide inclusions. [Solution] A martensitic stainless-steel sheet which has a steel composition that contains, in terms of mass%, 0.030-0.300% C, 0.20-2.50% Si, 0.15-4.00% Mn, 0.01-1.00% Ni, 11.00-15.00% Cr, 0.001-0.100% N, 0.0001-0.0350% Al, 0-0.50% V, 0-0.50% Nb, 0-0.50% Ti, and 0-0.020% B, with the remainder comprising Fe and unavoidable impurities, and that has a value of γmax, determined by the following equation (1), of 80.0 or greater, and in which oxide inclusions are observed in the metallographic structure, the oxide inclusions having a converted composition comprising up to 30 mass% Al2O3, 20-60 mass% SiO2, and 15-70 mass% MnO. |
