HIGH-STRENGTH LOW-ALLOY CONSTRUCTIONAL STEEL Russian patent published in 2017 - IPC C22C38/46 

FIELD: metallurgy.

SUBSTANCE: steel contains, wt %: carbon from more than 0.50 to 0.70, manganese 0.42-0.82, silicon 0.80-1.80, chromium 0.80-2.00, nickel 1.50-3.00, molybdenum 0.30-0.60, aluminium 0.02-0.15, vanadium 0.02-0.12, cerium 0.005-0.02, copper 0.03-2.00, calcium from more than 0.005 to 0.015, iron and unavoidable impurities are the rest. A combination of high strength and plasticity of steel is provided, namely: tensile strength (σ_B) 2200-2500 MPa, elongation (δ) 12-14.5%, relative narrowing (Ψ) 30-40%, impact strength (KCU) more than 50 J/M² and hardness (HRC) 56-60.

EFFECT: improved strength and plasticity of steel.

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