Ferritic stainless steel exhibiting excellent atmospheric corrosion resistance and crevice corrosion resistance

摘要

A ferritic stainless steel exhibiting excellent atmospheric corrosion resistance and crevice corrosion resistance can be provided by positively adding P thereto and by adequately adjusting Ca and Al. The ferritic stainless steel according to the present invention essentially consists of, in weight percentages,C : about 0.05 % or less Si : about 1.0 % or lessCr : about 11 % or more and less than about 20 %Mn : about 1.0 % or less N : about 0.10 % or lessS : about 0.03 % or lessCa : about 5 ppm or more and about 50 ppm or lessAI : about 0.5 % or lessP : more than about 0.04 % and about 0.20 % or less and the balance being iron and incidental impurities. The stainless steel according to the present invention may also contain at least one element selected from a group (1) consisting of about 6% or less of Mo, group (2) consisting of about 1.0 % or less of Cu, about 3% or less of Ni and about 3 % or less of Co, or group (3) consisting of about 1.0 % or less of Ti, about 1.0 % or less of Nb, about 1.0 % or less of V, about 1.0 % or less of W, about 1.0 % or less of Zr, about 1.0 % or less of Ta and about 0.05 % or less of B.