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HIGH STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT ELONGATION PROPERTY, STRETCH FLANGE PROPERTY AND TENSILE FATIGUE PROPERTY, AND ITS PRODUCTION METHOD
HIGH STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT ELONGATION PROPERTY, STRETCH FLANGE PROPERTY AND TENSILE FATIGUE PROPERTY, AND ITS PRODUCTION METHOD
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机译:具有优异的伸长率特性,拉伸凸缘特性和拉伸疲劳特性的高强度热轧钢板及其生产方法
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摘要
PROBLEM TO BE SOLVED: To provide a high strength hot rolled steel sheet having a high strength satisfying TS≥780 MPa, and also having excellent elongation properties, stretch flange properties and tensile fatigue properties.;SOLUTION: The steel sheet contains, by mass, 0.03 to 0.2% Ti and 0.03 to 0.5% Mo as essential components, and has a steel structure, by occupancy ratio to the whole structure, 40 to 96% ferrite, 4 to 15% retained austenite, and the balance substantially bainite, and in which precipitates composed of Ti, Mo and C are precipitated into ferrite, the average diameter of the precipitates is controlled to ≤20 nm, and the average spacing between the precipitates is controlled to ≤60 nm.;COPYRIGHT: (C)2006,JPO&NCIPI
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