COLD-ROLLED STEEL FOR DEEP DRAWING

• Main Authors: RUZAEV D.G, NIKOLAEV O.A, GORIN A.D, BURKO D.A, RODIONOVA I.G, AFANAS'EV E.V, CHISTJAKOV I.P, MOROZOV A.A, SARYCHEV A.F, NOSOV A.D, RASHNIKOV V.F, BODJAEV JU.A, KORNEEV V.M, ZIN'KO B.F, FOMIN E.S, TAKHAUTDINOV R.S
• Format: Patent
• Language: English; Russian
• Published: 10.08.2004
• Edition: 7
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

FIELD: metallurgy. ^ SUBSTANCE: invention relates to composition of cold-rolled steel designating for making articles with complex configuration being mainly for car articles, among them, with protective covers. The claimed cold-rolled steel for deep drawing comprises components taken in the following ratio, wt.-%: carbon, 0.001-0.006; silicon, 0.002-0.020; manganese, 0.07-0.30; phosphorus, 0.005-0.020; sulfur, 0.005-0.010; aluminum, 0.015-0.050; nitrogen, 0.002-0.006; titanium, 0.02-0.08; niobium, 0.005-0.060; oxygen, 0.001-0.005; iron and inevitable impurities, the balance. The total content of aluminum and titanium is 0.07-0.12 wt.-% and the ratio of aluminum content to oxygen content is less 5.0. Minimal titanium content is calculated from the following ratio: (Ti)min = 3.43 (N) + 2.4 (S) wherein (Ti), (N) and (S) mean the content of titanium, nitrogen and sulfur, respectively, in wt.-%. Optimal niobium content in steel is determined from the following ratio: 0.005% <= (Nb) <= 7.75 (C) or 7.75 (C) < (Nb) <= 0.06% wherein (C) and (Nb) mean the content of carbon and niobium, respectively, in wt.-%. Invention provides enhancing stamping capacity of steel being independently of regimen of thermal treatment and applying the protective cover, and enhancing the corrosion resistance also. ^ EFFECT: valuable properties of steel. ^ 3 cl, 1 tbl, 1 ex