STEEL SHEET AND METHOD OF STEEL SHEET Russian patent published in 2017 - IPC C21D8/02 C22C38/00 C21D8/10 

FIELD: metallurgy.

SUBSTANCE: to provide improved deformation capacity of a steel, method comprises melting steel containing, wt%: carbon – 0.04–0.08, silicon – 0.10–0.30, manganese –1.60–1.85, chromium – not more than 0.30, nickel – 0.20–0.40, molybdenum – 0.10–0.25, copper – not more than 0.30, aluminium – not more than 0.05, niobium – 0.03–0.06, titanium – 0.010–0.020, vanadium – not over 0.01, sulphur – not more than 0.003, phosphorus – not more than 0.013, balance is iron and unavoidable impurities to produce a slab, slab is heated to 1,100–1,200 °C, rough rolling at 950÷1,050 °C, cooling in air, finish rolling at 700÷820 °C to required thickness of sheet with total reduction of 75–85 %, cooling at a rate of 20÷35 °C/s to 300÷500 °C and cooling on air to temperature not higher than 150 °C.

EFFECT: disclosed is a method of producing a steel sheet with thickness of 15–40 mm with yield point higher than 480 MPa.

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