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HIGH TENSILE STRENGTH HOT ROLLED STEEL PLATE, HAVING SUPERFINE GRAIN AND EXCELLENT IN DUCTILITY, TOUGHNESS, FATIGUE CHARACTERISTIC, AND STRENGTH-DUCTILITY BALANCE, AND ITS PRODUCTION
HIGH TENSILE STRENGTH HOT ROLLED STEEL PLATE, HAVING SUPERFINE GRAIN AND EXCELLENT IN DUCTILITY, TOUGHNESS, FATIGUE CHARACTERISTIC, AND STRENGTH-DUCTILITY BALANCE, AND ITS PRODUCTION
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机译：高强度热轧钢板，具有超细晶粒，在延性，韧性，疲劳特性和强度-延性平衡及其生产方面表现优异
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摘要
PROBLEM TO BE SOLVED: To provide a high tensile strength hot rolled steel plate, composed of a structure of remained austenite and superfine polygonal ferrite in an as-hot- rolled state, having superfine grains, and excellent in ductility, toughness, fatigue resistance, and a balance between strength and ductility, and a method for producing this steel plate. ;SOLUTION: This steel plate is a high tensile strength hot-rolled steel plate containing, by weight, 0.05-0.30% C, 0.30-2.0% Si, 1.0-2.5% Mn, 0.003-0.100% Al, and 0.05-0.30% Ti, further composed of 5-20% (volume ratio) of remained austenite and ≥75% (volume ratio) of polygonal ferrite of 10μm average grain size, having superfine grains, and excellent in ductility, toughness, fatigue characteristic, and a balance between strength and ductility. The steel plate can be produced by subjecting a slab to heating at a low temp., to rolling at a draft of ≥20%/pass two or more times, to finish rolling at a temp. not lower than the Ar3 transformation point, to cooling at ≥20°C/sec cooling rate, and then to coiling at 350-550°C.;COPYRIGHT: (C)1997,JPO
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