| 简介 |
PROBLEM TO BE SOLVED : To provide a high purity ferritic stainless steel in which deterioration of surface properties caused by corrosion in pitting and rust development can be remedied to those of SUS304 or above without causing deterioration in productivity and workability and also without depending on the addition of rare elements, and to provide a method for producing the same.
SOLUTION : The ferritic stainless steel is provided which has a composition comprising, by mass, ≤0.01% C, 0.01 to 0.20% Si, 0.01 to 0.30% Mn, ≤0.04% P, ≤0.01% S, 13 to 22% Cr, 0.001 to 0.020% N, 0.05 to 0.35% Ti, 0.005 to 0.050% Al and 0.001 to 1% Sn, and the balance Fe with inevitable impurities, wherein by the addition of Sn, a passive film is modified to improve its corrosion resistance. For increasing the modifying effect of the passive film by the addition of Sn, after finish annealing, the ferritic stainless steel is retained in the temperature range of 200 to 700°C for ≥1 min.
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