首页>
外国专利>
HOT ROLLED HIGH STRENGTH STEEL PLATE OF HIGH YIELD RATIO TYPE, EXCELLENT IN FORMABILITY, BY CONTINUOUS HOT ROLLING PROCESS AND ITS PRODUCTION
HOT ROLLED HIGH STRENGTH STEEL PLATE OF HIGH YIELD RATIO TYPE, EXCELLENT IN FORMABILITY, BY CONTINUOUS HOT ROLLING PROCESS AND ITS PRODUCTION
展开▼
机译:连续热轧工艺生产出高成形率,高成形性的高强度热轧高强度钢板及其生产
展开▼
页面导航
摘要
著录项
相似文献
摘要
PROBLEM TO BE SOLVED: To improve the material quality at the head and the tail end of a high yield ratio type hot rolled high strength steel plate excellent in formability and to remove the dispersion of material quality in a coil. ;SOLUTION: A steel slab, which has a chemical composition containing, by weight ratio, 0.16-0.30% C, 0.5-3.0% Si, 0.5-3.0% Mn, ≤0.020% P, ≤0.010% S, 0.005-0.100% Al, and Fe as essential components and satisfying Si+Mn=1.5 to 6.0%, is rolled by a continuous hot rolling process. The resultant steel plate has a microstructure constituted of three phases of ferrite, bainite, and retained austenite, and, in this steel plate, the ratio between the volume occupancy of ferrite (VF) and the grain size of ferrite (dF) is ≥7 and fluctuation in a coil is 4 and, further, the volume occupancy of retained austenite of ≤2μm is ≥5% and fluctuation in a coil is 5%. As characteristics, this steel plate has ≥60% yield ratio(YR), ≥2000(kgf/mm2.%) strength- ductility balance [(tensile strength)×(total elongation)], ≥1.1, spreading ratio (d/d0), and ≥10% uniform elongation, and further, the fluctuation of TS in a coil, the fluctuation of TS×TEl, and the fluctuation of d/d0 are regulated to 101kgf/mm2), 500(kgf/ mm2.%), and 0.2, respectively.;COPYRIGHT: (C)1997,JPO
展开▼
机译:要解决的问题:提高成型性优异的高屈服比型热轧高强度钢板的前端和后端的材料质量,并消除卷材中材料质量的分散。 ;解决方案:一种钢板,其化学成分按重量比包含0.16- <0.30%C,0.5-3.0%Si,0.5-3.0%Mn,≤0.020%P,≤0.010%S,0.005-0.100通过连续的热轧工艺轧制%Al和Fe作为基本成分并满足Si + Mn => 1.5至6.0%。所得钢板具有由铁素体,贝氏体和残余奥氏体的三相构成的显微组织,并且在该钢板中,铁素体的体积占有率(VF)与铁素体的粒径(dF)之比≥7。线圈的波动小于4,且残留奥氏体的体积占有率≤2μm≥5%,线圈的波动≤5%。作为特性,该钢板具有≥60%的屈服比(YR),≥2000(kgf / mm 2 Sup>。%)强度-延展性平衡[(拉伸强度)×(总延伸率)],≥ 1.1,铺展比(d / d 0 Sub>)和≥10%均匀伸长率,此外,线圈中TS的波动,TS×TEl的波动和d / d的波动 0 Sub>分别调节为<101kgf / mm 2 Sup>),<500(kgf / mm 2 Sup>。%)和<0.2。版权所有:(C)1997,日本特许厅
展开▼