FERRITIC STAINLESS STEEL Russian patent published in 2023 - IPC C22C38/50 C22C38/48 C22C38/46 C22C38/44 C22C38/42 

FIELD: metallurgy.

SUBSTANCE: invention to ferritic stainless steel obtained using AOD (argon-oxygen decarburization) technology and used for the manufacture of parts for automobile exhaust systems, fuel cells, as well as in the energy sector, instruments, furnaces and other industrial high-temperature systems. Ferritic stainless steel consists of, wt.%: 0.003–0.035 carbon, 0.05–1.0 silicon, 0.10–0.8 manganese, 18–22 chromium, 0.05–0.8 nickel, 0.003–2.5 molybdenum, 0.2–0, 8 copper, 0.003–0.05 nitrogen, 0.05–1.0 titanium, 0.05–1.0 niobium, 0.03–0.5 vanadium, 0.010–0.04 aluminium, with C + N in aggregate is less than 0.06, and the rest is iron and inevitable impurities. For steel components, the following relationships apply: (Ti+Nb)/(C+N) is 8 or more and less than 40, Ti_eq/C_eq=(Ti+0.515*Nb+0.940*V)/(C+0.858*N) is 6 or more and less 40 and L_eq=5.8*Nb+5*Ti*Si is 3.3 or more.

EFFECT: steel has high corrosion resistance, weldability and increased strength at high temperatures.

24 cl, 4 dwg, 6 tbl