AUSTENITIC-FERRITIC STAINLESS STEEL Russian patent published in 2019 - IPC C22C38/50 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to corrosion-resistant steels of austenitic-ferritic class, and can be used in metallurgical, oil processing and gas industry, in power engineering during production of heat exchange equipment of nuclear power plants, in chemical machine building and other industries at operating temperatures from -50 to +350 °C. Steel contains carbon, silicon, manganese, chromium, nickel, molybdenum, nitrogen, copper, cerium, calcium, barium, aluminum, niobium, zirconium, zirconium carbonitride particles with size of 30–65 nm, iron and impurities at following ratio of components, wt%: carbon 0.01–0.03, silicon 0.3–0.8, manganese 0.8–1.2, chromium 26.0–28.0, nickel 7.5–8.0, molybdenum 4.5–5.2, nitrogen 0.30–0.50, copper 1.5–2.5, cerium 0.001–0.025, calcium 0.005–0.025, barium 0.005–0.025, aluminum 0.01–0.02, niobium 0.15–0.20, zirconium 0.02–0.04, zirconium carbonitride particles 0.03–0.10, iron and impurities – the rest.

EFFECT: high strength and ductility characteristics of steel combined with high corrosion resistance in aggressive media.

5 cl, 2 tbl