LOW-CARBON COLD-ROLLED SHEET STEEL FOR DEEP-DRAWING OF DOMESTIC PRODUCTS Russian patent published in 2010 - IPC C22C38/50 C21D8/04 

FIELD: metallurgy.

SUBSTANCE: steel contains carbon, manganese, silicon, sulphur, phosphorus, chrome, nickel, copper, nitrogen, aluminium, titanium, niobium and iron, at following ratio of components, wt %: carbon 0.008 ÷ 0.01; manganese 0.15 ÷ 0.25, silicon ≤ 0.03; sulphur ≤ 0.013, phosphorus ≤ 0.015, chrome ≤ 0.04, nickel ≤ 0.06, copper ≤ 0.06, nitrogen ≤ 0.008, aluminium 0.02 ÷ 0.07, titanium (2.4S+3.43N) ÷ (2.4S+3.43N)+0.03, niobium 7.75C ÷ 7.75C+0.02, iron is the rest, where (S), (N) and (C) - content in steel of sulphur, nitrogen and carbon. Steel allows ultimate strength σ_u = 270 ÷ 370 N/mm², yield strength σ_yδ < 240 N/mm², percent elongation δ₄ ≥ 34%, plastic anisotropy coefficient r₉₀ ≥ 1.1.

EFFECT: increased consumer properties of steel.

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