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HIGH TENSILE STRENGTH COLD ROLLED STEEL SHEET WITH COMPOSITE STRUCTURE HAVING EXCELLENT STRETCH FLANGING PROPERTY, STRENGTH-DUCTILITY BALANCE AND STRAIN AGE HARDENABILITY, AND METHOD OF PRODUCING THE SAME
HIGH TENSILE STRENGTH COLD ROLLED STEEL SHEET WITH COMPOSITE STRUCTURE HAVING EXCELLENT STRETCH FLANGING PROPERTY, STRENGTH-DUCTILITY BALANCE AND STRAIN AGE HARDENABILITY, AND METHOD OF PRODUCING THE SAME
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机译：具有出色的拉伸翻边性能，强度-延性平衡和应变时效性的复合结构高强度高强度冷轧钢板及其制造方法
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摘要
PROBLEM TO BE SOLVED: To provide a high tensile strength cold rolled steel sheet with a composite structure which has TS (Tensile Strength) of ≥440 MPa, and has excellent a strength-ductility balance and strain age hardenability, and to provide a method of producing the same.;SOLUTION: A slab comprising 0.01 to 0.10% C and 0.0050 to 0.0250% N, also satisfying ≥0.3 N/Al, and furthercomprising C, N, Mn, and Si so that 12(C+N)+Mn-Si satisfies 0.1 to 1.5 is produced. Next, the slab is subjected to a hot rolling stage wherein it is heated to ≥1,000°C, is thereafter subjected to rough rolling and finish rolling at an outlet side temperature of ≥800°C and is coiled at ≤750°C; a cold rolling stage; and an annealing stage wherein it is subjected to annealing of heating to an annealing temperature of (Ac1+20°C) to (Ac3+50°C), is subjected to first cooling wherein CR (Cooling Rate) from the annealing temperature to a prescribed temperature (cooling finishing temperature) in the range of (Ac1+20°C) to (Ac3-100°C) is 5 to 50°C/s, is subjected to secondary cooling wherein CR from the cooling finishing temperature to 100°C is ≥300°C/s, and is tempered at 150 to 450°C. These stages are successively performed.;COPYRIGHT: (C)2004,JPO
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