High strength and low yield ratio cold rolled steel sheet and method of manufacturing the same
    11.
    发明申请
    High strength and low yield ratio cold rolled steel sheet and method of manufacturing the same 有权
    高强度低屈服比的冷轧钢板及其制造方法

    公开(公告)号:US20050161134A1

    公开(公告)日:2005-07-28

    申请号:US11044185

    申请日:2005-01-28

    摘要: To provide a high strength and low yield ratio cold rolled steel sheet having high elongation property and high flange drawing property, or a plated steel sheet made by plating the same. The high strength and low yield ratio cold rolled steel sheet or the plated steel sheet made by plating the same has such a constitution as 0.10 to 0.25% of C, 1.0 to 2.0% of Si and 1.5 to 3.0% of Mn, are contained in terms of weight percentage, while other elements are controlled such as Al within 0.2%, P within 0.15% and S within 0.02%, with residual austenite occupying at least 5%, bainitic ferrite occupying at least 60% (preferably 80% or more), and polygonal ferrite within 20% (containing 0%), so that a tensile strength is 980 MPa or higher, while an elongation (El in %), a flange drawing property (λ in %), a tensile strength (TS in MPa) and a yield strength (YP in MPa) satisfy the following inequality (1): [(El×λ×TS)/YP]≧645.

    摘要翻译: 为了提供具有高伸长率和高法兰拉拔性能的高强度和低屈服比的冷轧钢板,或通过电镀其制成的镀覆钢板。 高强度低屈服比的冷轧钢板或通过电镀钢板制成的镀覆钢板具有C:0.10〜0.25%,Si:1.0〜2.0%,Mn:1.5〜3.0% 贝氏体铁素体占据至少60%(优选为80%以上)的贝氏体铁素体,而其他元素则控制在Al的0.2%以内,P在0.15%以内,S在0.02%以内,残留奥氏体占5% ,多边形铁素体为20%以下(含0%),拉伸强度为980MPa以上,拉伸强度(El%),凸缘拉伸性(拉伸%),拉伸强度 )和屈服强度(YP,MPa)满足以下不等式(1):[(ElxlambDaxTS)/ YP]> = 645。

    HIGH-STRENGTH STEEL SHEETS AND PROCESSES FOR PRODUCTION OF THE SAME
    20.
    发明申请
    HIGH-STRENGTH STEEL SHEETS AND PROCESSES FOR PRODUCTION OF THE SAME 审中-公开
    高强度钢板及其制造方法

    公开(公告)号:US20090277547A1

    公开(公告)日:2009-11-12

    申请号:US12305998

    申请日:2007-07-13

    摘要: A high strength steel sheet with both excellent elongation and stretch-flanging performance is provided.The high strength steel sheet of the present invention comprises, in percent by mass, C: 0.05 to 0.3%, Si: 0.01 to 3.0%, Mn: 0.5 to 3.0%, Al: 0.01 to 0.1%, and Fe and inevitable impurities as the remainder, and has a structure mainly composed of tempered martensite and annealed bainite. The space factor of the tempered martensite is 50 to 95%, the space factor of the annealed bainite is 5 to 30%, and the mean grain size of the tempered martensite is 10 μm or smaller in terms of the equivalent of a circle diameter. The steel sheet has a tensile strength of 590 MPa or higher.The high strength steel sheet of the present invention has a space factor of the martensite phase which is a main component of the metal structure is 80% or higher; the mean grain size of the martensite phase is 10 μm or smaller in terms of the equivalent of a circle diameter; in the martensite phase, the space factor of the martensite phase having a grain size of 10 μm or larger in terms of the equivalent of a circle diameter is 15% or lower; and the space factor of the retained austenite phase in the metal structure is 3% or lower.The high strength steel sheet of the present invention is a dual phase steel sheet mainly composed of a ferrite phase and martensite, and the space factor of the ferrite phase is 5 to 30%, and the space factor of the martensite phase is 50 to 95%. Moreover, the ferrite phase is annealed martensite.

    摘要翻译: 提供了具有优异伸长率和拉伸凸缘性能的高强度钢板。 本发明的高强度钢板以质量%计含有C:0.05〜0.3%,Si:0.01〜3.0%,Mn:0.5〜3.0%,Al:0.01〜0.1%,Fe和不可避免的杂质: 其余部分,主要由回火马氏体和退火贝氏体组成。 回火马氏体的空间系数为50〜95%,退火贝氏体的空间系数为5〜30%,回火马氏体的平均粒径以等于圆直径为10μm以下。 钢板的拉伸强度为590MPa以上。 本发明的高强度钢板具有作为金属组织的主要成分的马氏体相的空间系数为80%以上的特征。 相对于圆直径,马氏体相的平均粒径为10μm以下。 在马氏体相中,相对于圆直径,粒径为10μm以上的马氏体相的间隔系数为15%以下; 并且金属结构中的残余奥氏体相的空间系数为3%以下。 本发明的高强度钢板是主要由铁素体相和马氏体组成的双相钢板,铁素体相的空间系数为5〜30%,马氏体相的间隔系数为50〜95 %。 此外,铁素体相是退火马氏体。