Cold workability, toughness, corrosion resistance of excellent ferritic stainless steel and its manufacturing method

摘要

PURPOSE:To obtain the steel having superior corrosion resistance close to that of SUS 304 in the ordinary use by specifying the composition of a ferritic stainless steel. CONSTITUTION:A steel stock having a composition which consists of, by weight, =0.020% C, =0.30% Si, =0.50% Mn, =0.020% P, =0.010% S, 16.0-25.0% Cr, =1.0% Cu, =1.0% Ni, =3.0% Mo, =0.010% O, =0.025% N, Nb in the range where the ratio of Nb to (C+N) is 1-20, and the balance Fe and in which (C+N) is regulated to =0.040% is used, or, either of 0.03-0.50% each of Ti and Zr may be added to the above stock. By this method, the ferritic stainless steel excellent in cold workability, toughness, and corrosion resistance can be obtained.