Nickel-saving high nitrogen austenite precipitation hardening type stainless steel cold-rolled steel sheet manufacturing method

摘要

The present invention increases the Cr content for the purpose of improving the corrosion resistance by replacing part of the high-strength Ni with N without adding Mo, and by adding a trace amount of Nb in order to increase the strength, it is precipitated during hot-And an object of the present invention is to produce an austenitic precipitation hardening type stainless steel cold-rolled steel sheet having excellent ductility and high strength.;The present invention relates to an austenitic precipitation hardening type stainless steel cold-rolled steel sheet production method which comprises, by weight%, 0.03% or less of C, 15-17% of Cr, 2-7.5% of Ni, 0.1-0.2% of Nb,-0.15%, Si: 0.5% or less, and other unavoidable impurities are hot-rolled, hot-rolled sheet annealed at a temperature of 1200-1260C, cold-rolled at a reduction ratio of 80% , An annealing treatment is carried out at a temperature between the termination temperature of the martensite-austenite transformation and the temperature of the end transformation temperature + 50C, and then the air-cooling or water-cooling treatment is carried out. The present invention relates to a cold-rolled steel sheet manufacturing method.