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Production mannered null mass of the high tension cold rolling steel sheet for deep drawing which is superior in
Production mannered null mass of the high tension cold rolling steel sheet for deep drawing which is superior in
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机译:高拉伸深拉高强度冷轧钢板的生产质量零缺陷。
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摘要
PROBLEM TO BE SOLVED: To provide a method for producing a high tensile strength cold rolled deep-drawing steel sheet excellent in surface properties.;SOLUTION: A steel having a composition containing, by mass, 0.0040 to 0.02% C, ≤1.5% Si, 0.5 to 3.0% Mn, 0.01 to 0.1% P, ≤0.02% S, ≤1.0% sol.Al, ≤0.005% N and 0.02 to 0.2% Nb, and the balance Fe with inevitable impurities, and in which (12/93)×(Nb/C) prescribed by the Nb content and the C content satisfies 1.0 to 3.0 is melted, is thereafter subjected to continuous casting while being cooled at the average casting velocity Vc satisfying 1≤Vc≤4.5-0.5×(12/93)×(Nb/C) prescribed by the Nb content and the C content {wherein, Vc is the average casting velocity (m/min), and the atomic symbols satisfy the respective contents (mass%)} at a cooling water content of 0.5 to 4.0 l/kg (the water content used per kg of the steel ingot), is next subjected to hot rolling, pickling and cold rolling, and is then annealed at a recrystallization temperature or above.;COPYRIGHT: (C)2007,JPO&INPIT
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