AUSTENITIC CORROSION-RESISTANT STEEL Russian patent published in 2004 - IPC

FIELD: metallurgy industry: production of austenitic corrosion-resistant high density welded steels. SUBSTANCE: the invention is dealt with production of austenitic corrosion-resistant high density welded steels. Such steel is used as a structural material for atomic power plants, and also in shipbuilding, energophysical apparatus building, in vacuum technology. The steel contains the following components, mass %: carbon - 0.005-0.015; silicium - 0.1-0.3; manganese - 1.3-1.8; sulphur 0.005-0.010; phosphorus 0.005-0.015; chromium - 17-18; nickel 13.5-14.5; titanium 0.005-0.03; niobium 0.1-0.3; nitrogen 0.005-0.015; oxygen 0.001-0.005; yttrium - 0.04-0.09; zirconium 0.1-0.3; wolfram 1.3-1.6; iron the rest. The steel has improved weldability, increased gas-proof, high degree purity to harmful impurities (admixtures) and non-metallic impurities, resistance to an intercrystalline corrosion in a broad temperature range and to a corrosion cracking in a chlorine-containing medium. EFFECT: increased weldability, gasproof, purity, resistance to an intercrystalline corrosion and a corrosion cracking. 5 tbl