STAINLESS STEEL EXCELLENT IN CORROSION RESISTANCE, FERRITIC STAINLESS STEEL EXCELLENT IN CREVICE CORROSION RESISTANCE AND FORMABILITY, AND FERRITIC STAINLESS STEEL EXCELLENT IN CREVICE CORROSION RESISTANCE

摘要

The first embodiment relates to a stainless steel which contains C: 0.001 to 0.02%, N: 0.001 to 0.02%, Si: 0.01 to 0.5%, Mn: 0.05 to 0.5%, P: 0.04% or below, S: 0.01% or below, Ni: more than 3% to 5%, Cr: 11 to 26%, and one or more of Ti: 0.01 to 0.5% and Nb: 0.02 to 0.6% with the balance consisting of Fe and unavoidable impurities. The second embodiment relates to a ferritic stainless steel which has an alloy composition different from those of the first and third embodiments and satisfies the relationship (A): Cr+3Mo+6Ni ≥ 23 and the relationship (B): Al/Nb ≥ 10 with the balance consisting of Fe and unavoidable impurities. The third embodiment relates to a ferritic stainless steel which has an alloy composition different from those of the first and second embodiments and contains one or more of Sn: 0.005 to 2% and Sb: 0.005 to 1% with the balance consisting of Fe and unavoidable impurities.