| 摘要 |
PROBLEM TO BE SOLVED: To provide a ferritic stainless steel showing excellent corrosion resistance as-welded in warm water environment using clean water. SOLUTION: The ferritic stainless steel having excellent corrosion resistance in a welding gap oxide film is provided which includes a composition comprising, by mass,≤0.02% C, 0.01 to 0.3% Si,≤1% Mn,≤0.04% P,≤0.03% S, 0.3 to 2% Ni, 22 to 26% Cr,≤0.8% Mo, 0.10 to 0.6% Nb, 0.15 to 0.4% Ti,≤0.025% N and 0.04 to 0.3% Al, wherein the content of Cu as impurities is limited to <0.2%, and the balance Fe with the other inevitable impurities, and the ferritic stainless steel is characterized in that a test piece is obtained by forming a TIG welding gap structure in the cold rolled-annealed-pickled sheet of the above ferritic stainless steel at a gap depth of≥4 mm and a maximum gap spacing of≤30μm without using argon back gas seal and in the test piece, an average Cr ratio of oxide scale at the welding gap part within 2 mm from the bond edge part reaches≥20 mass% at the ratio of all the metallic elements. COPYRIGHT: (C)2009,JPO&INPIT
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