The ferritic stainless steel null mass where the surface which is superior in weld processability and resistance crevice corrosion

摘要

PROBLEM TO BE SOLVED: To provide a ferritic stainless steel having excellent weld zone workability and crevice corrosion resistance and reduced surface flaws.;SOLUTION: The ferritic stainless steel having excellent weld zone workability and crevice corrosion resistance and reduced surface flaws has a composition comprising, by mass, ≤0.020% C, ≤0.025% N, ≤0.25% Si, ≤0.20% Mn, ≤0.035% P, ≤0.010% S, 16 to 24% Cr, 0.50 to 2.00% Mo, 0.05 to 0.20% Ti and 0.05 to 0.40% Nb, and the balance Fe with inevitable impurities, and satisfying inequalities (A) and (B). If required, one or more kinds selected from ≤2.0% Ni, ≤1.0% Cu, ≤0.2% V, ≤0.2% Zr and 0.005% B may be incorporated therein; wherein, 21.5≤Cr+3.3Mo≤26 and Ti-0.28Mo≥-0.25 (A), and (Ti+Nb)/(C+N)≥16 and 0.2≤Ti/(Ti+Nb)≤0.8 (B) are satisfied.;COPYRIGHT: (C)2009,JPO&INPIT