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 有权
    高强度冷轧钢板,具有优异的可铸性和镀层钢板

    公开(公告)号:US20100092332A1

    公开(公告)日:2010-04-15

    申请号:US12640229

    申请日:2009-12-17

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

    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 μm) 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%),并且其中当观察到随机区域(15μm×15μm)时确定的残余奥氏体块的平均数为20以上 通过EBSP(电子背散射衍射图)。

    High-strength cold rolled steel sheet having excellent formability, and plated steel sheet
    5.
    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)。

    DUAL PHASE STEEL SHEET WITH GOOD BAKE-HARDENING PROPERTIES
    6.
    发明申请
    DUAL PHASE STEEL SHEET WITH GOOD BAKE-HARDENING PROPERTIES 审中-公开
    双相钢板具有良好的耐烧结性能

    公开(公告)号:US20090242085A1

    公开(公告)日:2009-10-01

    申请号:US12477299

    申请日:2009-06-03

    IPC分类号: C21D8/02 C22C38/00

    摘要: A dual phase steel sheet with good bake-hardening properties is provided. The steel sheet is characterized in containing (in terms of percent by mass) C: no less than 0.06% and less than 0.25%; Si+Al: 0.5 to 3%; Mn: 0.5 to 3%; P: no more than 0.15%; and S: no more than 0.02%; and also meeting the following condition (in terms of space factor) that retained austenite is at least 3%, bainite is at least 30%, and ferrite is no more than 50%, and further characterized in differing in stress larger than 50 MPa before and after application of 2% pre-strain and ensuing heat treatment for paint baking at 170° C. for 20 minutes. The steel sheet has well-balanced strength and workability, exhibits good bake-hardening properties at the time of paint baking, and offers good resistance to natural aging.

    摘要翻译: 提供了具有良好烘烤硬化性能的双相钢板。 钢板的特征在于含有(以质量%计)C:不小于0.06%且小于0.25%; Si + Al:0.5〜3% Mn:0.5〜3% P:不超过0.15%; S:不大于0.02%; 并且还满足以下条件(以空间因子计),残留奥氏体为3%以上,贝氏体为30%以上,铁素体为50%以下,其特征在于应力大于50MPa以下 并在施加2%预应变之后,并在170℃下进行油漆烘烤20分钟。 钢板具有平衡的强度和加工性,在烤漆时具有良好的烘烤硬化性能,并且具有良好的耐自然老化性。

    Dual phase steel sheet with good bake-hardening properties
    7.
    发明授权
    Dual phase steel sheet with good bake-hardening properties 有权
    双相钢板具有良好的烘烤硬化性能

    公开(公告)号:US09194015B2

    公开(公告)日:2015-11-24

    申请号:US12477299

    申请日:2009-06-03

    摘要: A dual phase steel sheet with good bake-hardening properties is provided. The steel sheet is characterized in containing (in terms of percent by mass) C: no less than 0.06% and less than 0.25%; Si+Al: 0.5 to 3%; Mn: 0.5 to 3%; P: no more than 0.15%; and S: no more than 0.02%; and also meeting the following condition (in terms of space factor) that retained austenite is at least 3%, bainite is at least 30%, and ferrite is no more than 50%, and further characterized in differing in stress larger than 50 MPa before and after application of 2% pre-strain and ensuing heat treatment for paint baking at 170° C. for 20 minutes. The steel sheet has well-balanced strength and workability, exhibits good bake-hardening properties at the time of paint baking, and offers good resistance to natural aging.

    摘要翻译: 提供了具有良好烘烤硬化性能的双相钢板。 钢板的特征在于含有(以质量%计)C:不小于0.06%且小于0.25%; Si + Al:0.5〜3% Mn:0.5〜3% P:不超过0.15%; S:不大于0.02%; 并且还满足以下条件(以空间因子计),残余奥氏体为3%以上,贝氏体为30%以上,铁素体为50%以下,其特征在于应力大于50MPa以下 并在施加2%预应变之后,并在170℃下进行油漆烘烤20分钟。 钢板具有平衡的强度和加工性,在烤漆时具有良好的烘烤硬化性能,并且具有良好的耐自然老化性。

    High-strength steel sheet having excellent workability and production process therefor
    9.
    发明授权
    High-strength steel sheet having excellent workability and production process therefor 有权
    具有优异的加工性的高强度钢板及其制造方法

    公开(公告)号:US07008488B2

    公开(公告)日:2006-03-07

    申请号:US10614821

    申请日:2003-07-09

    IPC分类号: C22C38/02 C22C38/04 C21D8/02

    摘要: A high-strength steel sheet comprises carbon: 0.06 to 0.25 mass %, Si: 0.5 to 3.5 mass % and Mn: 0.7 to 4 mass %. Its mother structure is ferrite, its second phase structure comprises martensite and the residual austenite and the second phase structure measured by image analysis has an area fraction of 25% or less based on the total structure. The steel sheet satisfies the following requirements (1) to (3): (1) the volume fraction (Vtγhd R) of the residual austenite is 5% or more; (2) the ratio (SFγR/VtγR) of the area fraction (SFγR) of the residual austenite within ferrite to VtγR is 0.65 or more; and (3) the ratio [α2/(α1+γR)] of the space factor (α2) of martensite to the second phase structure (α1+γR) is 0.25 to 0.60. The steel sheet has excellent balance between strength and local elongation, and a low yield ratio.

    摘要翻译: 高强度钢板包含:0.06〜0.25质量%的碳,Si:0.5〜3.5质量%,Mn:0.7〜4质量%。 其母体结构是铁素体,其第二相结构包括马氏体,残余奥氏体和通过图像分析测量的第二相结构基于总结构具有25%或更小的面积分数。 钢板满足以下要求(1)〜(3):(1)残余奥氏体的体积分数(Vtgammahd R)为5%以上; (2)铁素体中的残余奥氏体的面积率(SFgamma R)与Vtgamma之间的比值(SFgamma R/ Vtgamma R) R S为0.65以上; 和(3)马氏体相对于第二相结构(α1+γ')的空间因子(α2)的比值[α2/(α1+γ' 为0.25〜0.60。 钢板在强度和局部伸长率之间具有优异的平衡,并且产率低。