STAINLESS STEEL, STAINLESS STEEL MATERIAL, AND STAINLESS STEEL PRODUCTION METHOD

摘要

Provided is stainless steel in which the S content has been reduced and the formation of hard inclusions has been suppressed, wherein among inclusions having a circle equivalent diameter of 5 µm or greater, the number density of primary inclusions having an average composition comprising, in terms of mass%, 0-15% CaO, 0-20% SiO2, 50-70% Al2O3, and 10-40% MgO is 0.5 inclusions/mm2 or less, the number density of secondary inclusions having an average composition comprising, in terms of mass%, 10-70% CaO, 10-65% SiO2, at most 20% Al2O3, 5-50% MgO, and 0-5% CaF2 is 0.2 inclusions/mm2 or less, and the number density of tertiary inclusions having an average composition comprising, in terms of mass%, 5-40% CaO, 10-40% SiO2, 10-40% Al2O3, 5-30% MgO, and 5-40% CaF2 is 0.005 inclusions/mm2 to 0.5 inclusions/mm2. Also provided are a stainless steel material and a stainless steel production method.