| 摘要 |
PURPOSE:To improve the strength and toughness of the title steel at very low temp. by applying two-stage controlled rolling to an austenitic stainless steel in which respective contents of C, Si, Mn, Ni, Cr, N, and Nb are specified and forming the structure of the above steel into recrystallization working duplex structure. CONSTITUTION:An austenitic stainless steel having a composition consisting of, by weight, <=0.03% C, <=2% Si, <=20% Mn, 2-20% Ni, 16-30% Cr, 0.1-0.4% N, 0.02-0.25% Nb, and the balance Fe is refined. This steel is rough rolled at 1000-1200 deg.C and >=50% draft. After the above roughing, the steel is cooled for 10sec-5min. Subsequently, the above steel is rolled at 800-1000 deg.C finish rolling temp. and >=30% draft and then cooled at >=4 deg.C/min cooling rate, by which the structure of the steel is formed into recrystallization working duplex structure. |
