Stainless steel with low chromium content excellent in the corrosion resistance of repeatedly heat-affected zones and process for production thereof

摘要

A stainless steel with low chromium content which is little lowered in the corrosion resistance of a weld formed by repeated welding and is excellent in the intergranular corrosion resistance of a weld even under severe corrosive atmosphere and which is freed from preferential corrosion in the heat affected zone near a weld fusion line and is excellent in productivity. The stainless steel contains by mass C: 0.03% or below, N: 0.004 to 0.02%, Si: 0.2 to 1%, Mn: more than 1.5% to 2.5%, P: 0.04% or below, S: 0.03% or below, Cr: 10 to 15%, Ni: 0.2 to 3.0%, Al: 0.005 to 0.1%, and Ti: 4 × (C% + N%) to 0.35% with the balance consisting of Fe and unavoidable impurities and satisfies the requirements: γp(%) of 80 or above as represented by a prescribed numerical formula and Ti% × N% 0.004.