LOW-CARBON COLD-ROLLED SHEET STEEL FOR DEEP-DRAWING 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 0.005 ÷ 0.007; manganese 0.15 ÷ 0.25, silicon ≤ 0.02; sulphur ≤ 0.013, phosphorus ≤ 0.015, chrome ≤ 0.03, nickel ≤ 0.03, copper ≤ 0.05, nitrogen ≤ 0.007, aluminium 0.03 ÷ 0.06, 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 ÷ 330 N/mm², yield strength σ_y≤ 180 N/mm², percent elongation δ₄ ≥ 40%, plastic anisotropy coefficient r₉₀ ≥ 1.7 and work-hardening index n₉₀ ≥ 0.2.

EFFECT: increased consumer properties of steel.

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