PROCESS FOR THE PRODUCTION OF A STRIP OF A CHROMIUM STAINLESS STEEL OF A DUPLEX STRUCTURE HAVING HIGH STRENGTH AND ELONGATION AS WILL AS REDUCED PLANE ANISOTROPY

摘要

Process for producing steel strip of duplex structure wherein cold rolled strip of chromium stainless steel comprising, in addition to Fe, 10.0 % to 20.0% of Cr, to 0.10% of C, to 0.12% of N, the (C + N) being 0.01% to 0.20%, to 2.0% of Si, to 4.0% of Mn to 4.0% of Ni and to 4.0% of Cu, the { Ni + ( Mn + Cu)/3} being not less than 0.5% but not more than 5.0%, is continuously passed through a heating zone where it is heated to form a two-phase of ferrite and austenite and the heated strip is cooled at a cooling rate sufficient to transform the austenite to martensite. The product has high strength and elongation reduced plane anisotropy and hardness of at least HV 200.