STRUCTURAL STEEL Russian patent published in 1994 - IPC

FIELD: ferrous metallurgy. SUBSTANCE: steel has, wt.-%: carbon 0.05-0.10; silicon 0.15-0.35; manganese 1.0-1.5; nickel 4-5; niobium 0.02-0.06; nitrogen 0.008-0.020; aluminium 0.01-0.06; titanium 0.03-0.05; molybdenum 0.2-0.3; vanadium 0.12-0.16; copper 0.3-0.6, and iron - the rest. Ratio Cu: (Mn + Ni) = 0.06-0.09. Steel is used for manufacture of structures working at low temperatures, for examples, for reservoirs and pipeline for condensed gases. EFFECT: enhanced quality of steel. 2 tbl