OXIDE DISPERSION-STRENGTHENED-TYPE HIGH-MANGANESE AUSTENITIC STAINLESS STEEL

摘要

PURPOSE:To obtain an expensive and nonmagnetic oxide dispersion-strengthened- type high-manganese austenitic steel excellent in strength and toughness, by providing a specific composition consisting of C, Mn, Cr, Si, Al, N, Y2O3, and Fe and also by dispersing Y2O3 in the form of fine grains. CONSTITUTION:The oxide dispersion-strengthened-type high-manganese austenitic steel excellent in strength and toughness is obtained by providing a composition consisting of, by weight, 0.01-1% C, 12-50% Mn, 2-20% Cr, 0.1-5% Si, 0.01-4% Al, =0.25% N, 0.1-5% Y2O3, and the balance Fe with inevitable impurities and also by dispersing Y2O3 in the form of grains with =1mum grain size. In the above steel, either or both of 0.1-5% Mo and 0.1-5% W and/or one or more kinds among 0.01-1% Ti, 0.01-1% Nb, 0.01-1% Ta, and 0.005-0.2% Zr are contained besides the above essential components and Ti equivalent represented by (Ti+Ta+2Nb+4Zr)/(C+N) is regulated so that its value is 0.3-10 in order to improve strength, and further, =10% Ni, =5% Co, and =10% Cu are contained so as to improve oxidation resistance.