Ferritic stainless steel null for automobile exhaust air manifold

摘要

PURPOSE: To produce a ferritic stainless steel for an automotive exhaust manifold excellent in oxidation resistance, strength and thermal fatigue properties at a high temp. by preparing a ferritic stainless steel having a specified componental compsn. in which the contents of Cr, Si, C, N and Nb are prescribed. ;CONSTITUTION: A ferritic stainless steel for an automotive exhaust manifold having a chemical compsn. contg., by weight, ≤0.015% C, 0.80 to 1.50% Si, 0.20 to 0.60% Mn, ≤0.030% P, 11.0 to 14.0% Cr, ≤0.50% Ni, 0.30 to 0.60% Nb, ≤0.015% N so as to satisfy C+N≤0.025%, 0 to 0.20% Ti, 0 to 0.010% S, 0 to 1.50% Mo, 0 to 0.20% Al, total 0 to 10% of one or more kinds among Ca, Y, La and Cl; where the contents of Ti are regulated to 0.005 to 0.20% in the case of 0.003 to 0.010% S, and the balance Fe with impurities inevitably entering in the process of the production is prepd. Thus, the stainless steel excellent in high temp. salt damage corrosion resistance on the outer face side can be obtd.;COPYRIGHT: (C)1995,JPO