HIGH-STRENGTH NONMAGNETIC CORROSION-RESISTANT STEEL Russian patent published in 2019 - IPC C22C38/58 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to high-strength non-magnetic corrosion-resistant steels used for production of non-magnetic high-loaded parts operating under conditions of intense corrosion impact in power engineering, aircraft engineering, special shipbuilding and drilling equipment. Steel contains, wt%: carbon 0.03–0.06, silicon 0.10–0.5, chromium 20.0–22.0, manganese 16.0–18.0, nickel 8.0–10.0, molybdenum 0.8–1.5, nitrogen 0.6–1.0, vanadium 0.1–0.2, niobium 0.05–0.2, at least one of: calcium 0.005–0.01 and barium 0.005–0.01, copper 0.8–1.5, aluminum 0.005–0.02, nanoparticles of titanium carbonitride 0.03–0.1, nanoparticles of zirconium carbonitride 0.03–0.1, cerium 0.005–0.01, iron and impurities making the rest. Nanoparticles of titanium carbonitride and zirconium carbonitride have size of 30–65 nm. Steel can additionally contain at least one element selected from the group, wt%: boron 0.001–0.008, titanium 0.005–0.1 and zirconium 0.02–0.04. Total content of low-melting admixtures of lead, bismuth, tin, antimony and arsenic does not exceed 0.03 wt%, and content of impurities of sulfur, phosphorus and oxygen does not exceed, wt%: sulfur ≤ 0.006, phosphorus ≤ 0.008 and oxygen ≤ 0.003.

EFFECT: higher strength, plasticity and impact strength of steel.

5 cl, 2 tbl