Hot-dip galvanized steel sheet and process for production thereof
    1.
    发明授权
    Hot-dip galvanized steel sheet and process for production thereof 有权
    热镀锌钢板及其制造方法

    公开(公告)号:US06306527B1

    公开(公告)日:2001-10-23

    申请号:US09685096

    申请日:2000-10-11

    IPC分类号: B32B1518

    摘要: A hot-dip galvanized steel sheet which is produced from a cold-rolled steel sheet, as a base steel sheet, consisting essentially of C: 0.010-0.06 wt %, Si: no more than 0.5 wt %, Mn: no less than 0.5 wt % and less than 2.0 wt %, P: no more than 0.20 wt %, S: no more than 0.01 wt %, Al: 0.005-0.10 wt %, N: no more than 0.005 wt %, Cr: no more than 1.0 wt %, Mn+1.3Cr: 1.9-2.3 wt %, Fe: remainder, and having a structure composed of ferrite and a second phase containing martensite, said second phase in the structure accounting for no more than 20% in terms of area and martensite in the second phase accounting for no less than 50%, and which has a zinc-plated layer formed on the surface thereof by hot-dip galvanizing or hot-dip galvannealing. A process for production of said hot-dip galvanized steel sheet. This steel sheet has a composite structure containing martensite and yet it has a low strength (no higher than 500 MPa) and also has good strength-ductility balance.

    摘要翻译: 一种由冷轧钢板作为基本钢板制成的热浸镀锌钢板,其基本上由C:0.010-0.06重量%,Si:不大于0.5重量%,Mn:不小于0.5 重量%且小于2.0重量%,P:不大于0.20重量%,S:不大于0.01重量%,Al:0.005-0.10重量%,N:不大于0.005重量%,Cr:不大于1.0 重量%,Mn + 1.3Cr:1.9-2.3重量%,Fe:余量,并且具有由铁素体构成的结构和含有马氏体的第二相,所述结构中的所述第二相占面积不大于20% 第二相中的马氏体不低于50%,并且通过热浸镀锌或热浸镀锌合金在其表面形成有镀锌层。 一种生产所述热浸镀锌钢板的方法。 该钢板具有包含马氏体的复合结构,但其强度低(不高于500MPa),并且还具有良好的强度 - 延展性平衡。

    Galvanized steel sheet superior in ductility and process for production thereof
    2.
    发明授权
    Galvanized steel sheet superior in ductility and process for production thereof 有权
    延展性优异的加热冷却钢板及其制造方法

    公开(公告)号:US06316127B1

    公开(公告)日:2001-11-13

    申请号:US09553962

    申请日:2000-04-20

    IPC分类号: B32B1518

    摘要: A P- and Ti-added galvannealed steel sheet superior in ductility, and a process for production thereof. It is made of a cold-rolled steel sheet and has alloyed hot-dip galvanizing on the surface thereof, said cold-rolled steel sheet having the chemical composition (in terms of wt %) of C: less than 0.010%, Si: no more than 0.5%, Mn: 1.0˜3.0%, P: no more than 0.20%, S: no more than 0.01%, Al: 0.005˜0.10%, N: no more than 0.0050%, Ti/48−(C/12+N/14+S/32): 0.0003˜0.0018 with the remainder being chiefly Fe, and said cold-rolled steel sheet being characterized by &rgr;1≦107 and &rgr;2≦5×105, where &rgr;1 is the number of precipitates whose particle diameter (D) is in the range of 10 nm≦D

    摘要翻译: 具有优异延性的P型和Ti型合金化热镀锌钢板及其制造方法。 由冷轧钢板制成,其表面具有合金化的热浸镀锌,所述冷轧钢板的化学组成(按重量%计)C:小于0.010%,Si:不 大于0.5%,Mn:1.0〜3.0%,P:不大于0.20%,S:0.01%以下,Al:0.005〜0.10%,N:不大于0.0050%Ti / 48-(C / 12 + N / 14 + S / 32):0.0003〜0.0018,余量主要为Fe,所述冷轧钢板的特征在于rho1 <= 107且rho2 = 5×105,其中rho1是其颗粒 直径(D)在10nm <= D <100nm的范围内,rho2是其粒径(D)在100nm

    High-strength cold rolled steel sheet having excellent formability, and plated steel sheet
    4.
    发明申请
    High-strength cold rolled steel sheet having excellent formability, and plated steel sheet 审中-公开
    优异的成形性的高强度冷轧钢板,镀钢板

    公开(公告)号:US20050247378A1

    公开(公告)日:2005-11-10

    申请号:US11110716

    申请日:2005-04-21

    IPC分类号: C21D8/02 C22C38/12

    CPC分类号: C22C38/02 C22C38/04 C22C38/12

    摘要: To provide a high-strength cold rolled steel sheet that has well-balanced tensile strength and elongation as well as well-balanced tensile strength and stretch-flangeability, and a plated steel sheet manufactured by plating the steel sheet. The high-strength cold rolled steel sheet contains: 0.10 to 0.28% of C, 1.0 to 2.0% of Si, 1.0 to 3.0% of Mn, and 0.03 to 0.10% of Nb in terms of % by mass, wherein the content of Al is controlled to 0.5 or less, the content of P is controlled to 0.15% or less, and the content of S is controlled to 0.02% or less, and wherein residual austenite accounts for 5 to 20%, bainitic ferrite accounts for 50% or more, and polygonal ferrite accounts for 30% or less (containing 0%), of the entire structure, and wherein a mean number of residual austenite blocks is 20 or more as determined when the random area (15 μm×15 μμm) is observed by EBSP (electron back scatter diffraction pattern).

    摘要翻译: 提供具有良好的拉伸强度和伸长率以及平衡的拉伸强度和拉伸凸缘性的高强度冷轧钢板,以及通过电镀钢板而制成的镀覆钢板。 高强度冷轧钢板含有:以质量%计,C:0.10〜0.28%,Si:1.0〜2.0%,Mn:1.0〜3.0%,Nb:0.03〜0.10% 控制在0.5以下,P的含量控制在0.15%以下,S的含量控制在0.02%以下,残留奥氏体占5〜20%,贝氏体铁素体占50%, 更多的是多边形铁素体占整个结构的30%以下(含有0%),其中当通过EBSP观察到随机面积(15mumx15mumum)时,残留奥氏体块的平均数为20以上 (电子背散射衍射图)。

    High strength and low yield ratio cold rolled steel sheet and method of manufacturing the same
    9.
    发明授权
    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:US07591977B2

    公开(公告)日:2009-09-22

    申请号:US11044185

    申请日:2005-01-28

    IPC分类号: C22C38/02 C22C38/04 C22C38/06

    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 (λin %), 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(含有0%),拉伸强度为980MPa以上,伸长率(El%),凸缘拉伸性能(兰德因数%),拉伸强度(MPa) 屈服强度(YP,MPa)满足以下不等式(1):[(El×lambdaxTS)/ YP]> = 645。