HOT-DIP GALVANIZED COLD-ROLLED STEEL SHEET AND PROCESS FOR PRODUCING SAME
    2.
    发明申请
    HOT-DIP GALVANIZED COLD-ROLLED STEEL SHEET AND PROCESS FOR PRODUCING SAME 审中-公开
    热镀锌冷轧钢板及其制造方法

    公开(公告)号:US20140212686A1

    公开(公告)日:2014-07-31

    申请号:US14130530

    申请日:2012-06-29

    IPC分类号: C23C2/02 C21D8/02

    摘要: A hot-dip galvanized cold-rolled steel sheet has a tensile strength of 750 MPa or higher, a composition consisting, in mass percent, of C: more than 0.10% and less than 0.25%, Si: more than 0.50% and less than 2.0%, Mn: more than 1.50% and 3.0% or less, and optionally containing one or more types of Ti, Nb, V, Cr, Mo, B, Ca, Mg, REM, and Bi, P: less than 0.050%, S: 0.010% or less, sol. Al: 0.50% or less, and N: 0.010% or less, and a main phase as a low-temperature transformation product and a second phase as retained austenite. The retained austenite volume fraction is more than 4.0% and less than 25.0% of the whole structure, and has an average grain size of less than 0.80 □m. A number density of retained austenite grains having a grain size of 1.2 □m or more is 3.0□10−2/□m2 or less.

    摘要翻译: 热浸镀锌冷轧钢板的拉伸强度为750MPa以上,以质量%计,C:0.10以上且小于0.25%的Si:超过0.50%以下 2.0%,Mn:大于1.50%和3.0%以下,并且任选地含有一种或多种Ti,Nb,V,Cr,Mo,B,Ca,Mg,REM和Bi,P:小于0.050% ,S:0.010%以下,溶胶。 Al:0.50%以下,N:0.010%以下,作为低温相变产物的主相和作为残留奥氏体的第二相。 残留奥氏体体积分数大于整个结构的4.0%以上且小于25.0%,平均粒径小于0.80μm。 晶粒尺寸为1.2μm以上的残留奥氏体晶粒的数密度为3.0×10 -2 /□m 2以下。

    METHOD FOR PRODUCING COLD-ROLLED STEEL SHEET
    3.
    发明申请
    METHOD FOR PRODUCING COLD-ROLLED STEEL SHEET 审中-公开
    生产冷轧钢板的方法

    公开(公告)号:US20140238557A1

    公开(公告)日:2014-08-28

    申请号:US14130568

    申请日:2012-07-02

    IPC分类号: C21D8/02

    摘要: A method for producing a high-tensile cold-rolled steel sheet includes subjecting a slab having a composition containing C: more than 0.020% and less than 0.30%, Si: more than 0.10% and 3.00% or less, and Mn: more than 1.00% and 3.50% or less to hot rolling wherein the roll draft of the final one pass is higher than 15%, and rolling is finished in the temperature region of Ar3 point or higher, optionally annealing wherein the hot-rolled steel sheet is heated to 300° C. or higher after being cooled to 780° C. or lower, coiling higher than 400° C. or lower than 400° C., cold rolling the hot-rolled steel sheet or the annealed steel sheet, and annealing wherein the cold-rolled steel sheet is soaked in the temperature region of (Ac3 point−40° C.) or higher, cooling to 500° C. or lower and 300° C. or higher, and holding in that temperature region for 30 seconds or longer.

    摘要翻译: 一种高张力冷轧钢板的制造方法,其特征在于,将含有C:大于0.020%且小于0.30%的组成的钢坯,Si:0.10%以上且3.00%以下,Mn:超过 1.00%和3.50%以下,其中最终一次的轧制通过率高于15%,并且在Ar3点以上的温度区域中进行轧制,任选地进行热轧钢板的退火 冷却至780℃以下后,将其回收至300℃以上,卷取高于400℃或低于400℃,对该热轧钢板或退火钢板进行冷轧,退火, 将冷轧钢板浸渍在(Ac3-40℃)以上的温度区域,冷却至500℃以上且300℃以上,并在该温度区域保持30秒钟 或更长。

    COLD-ROLLED STEEL SHEET AND PROCESS FOR PRODUCTION THEREOF
    8.
    发明申请
    COLD-ROLLED STEEL SHEET AND PROCESS FOR PRODUCTION THEREOF 有权
    冷轧钢板及其生产方法

    公开(公告)号:US20140144553A1

    公开(公告)日:2014-05-29

    申请号:US13818351

    申请日:2011-08-22

    摘要: A cold-rolled steel sheet having a refined structure in which grain growth during annealing is suppressed has a chemical composition containing, in mass percent, controlled amounts of carbon, manganese, niobium, titanium, vanadium, sol. Aluminum, chromium, molybdenum, boron, calcium, and REM and a microstructure which contains at least 50% by area of ferrite as a main phase, a second phase containing at least 10% by area of a low temperature transformation phase and 0-3% by area of retained austenite and which satisfies the following Equations (1)-(3), in addition to a particular texture, dm

    摘要翻译: 具有抑制退火时的晶粒生长的精细结构的冷轧钢板,其质量百分比含有碳,锰,铌,钛,钒,溶胶的控制量的化学组成。 铝,铬,钼,硼,钙和REM以及包含至少50%面积的铁素体作为主相的微结构,第二相含有至少10%的低温相变相面积和0-3 除了特定的纹理外,dm <2.7 + 10000 /(5 + 300×C + 50×Mn + 4000×Nb + 2000×)的残余奥氏体面积除以下,满足下述式(1)〜(3) Ti + 400×V)2(1),dm <4.0(2)和ds&nlE; 1.5(3)其中dm是由具有倾斜角度的高角度晶界限定的铁素体的平均粒径(μm) 至少15°,ds是第二相的平均粒径(μm)。

    Method of producing hot-rolled steel sheet
    10.
    发明授权
    Method of producing hot-rolled steel sheet 有权
    生产热轧钢板的方法

    公开(公告)号:US07879164B2

    公开(公告)日:2011-02-01

    申请号:US12768253

    申请日:2010-04-27

    IPC分类号: C21D8/02 C21D9/46

    摘要: A steel sheet excellent in mechanical strength, workability and thermal stability and suited for use as a raw material in such fields of manufacturing automobiles, household electric appliances, machine structures, and of constructing buildings, and a manufacturing method thereof is provided. The steel sheet is a hot-rolled steel sheet of a carbon steel or low-alloy steel, the main phase of which is ferrite, and is characterized in that the average ferrite crystal grain diameter D(μm) at the depth of ¼ of the sheet thickness from the steel sheet surface satisfies the relations respectively defined by formulas (1) and (2) given below and the increase rate X (μm/min) in average ferrite crystal grain diameter at 700° C. at the depth of ¼ of the sheet thickness from the steel sheet surface and said average crystal grain diameter D(μm) satisfy the relation defined by the formula (3) given below: 1.2≦D≦7  formula (1) D≦2.7+5000/(5+350·C+40·Mn)2  formula (2) D·X≦0.1  formula (3) wherein C and Mn represent the content (in % by mass) of the respective elements in the steel.

    摘要翻译: 本发明提供一种机械强度,加工性,热稳定性优异且适用于制造汽车,家用电器,机器结构,建筑物等领域的原料的钢板及其制造方法。 该钢板是碳素钢或低合金钢的热轧钢板,其主相是铁素体,其特征在于,深度为1/4的平均铁素体晶粒直径D(μm) 从钢板表面的板厚满足下述式(1)和(2)所定义的关系,并且在700℃的平均铁素体晶粒直径的增加速度X(μm/ min)在深度为1/4 钢板表面的平均厚度和所述平均晶粒直径D(μm)满足以下公式(3)所定义的关系:1.2&nlE; D&nlE; 7式(1)D&nlE; 2.7 + 5000 /(5+ 350·C + 40·Mn)2式(2)D·X&nlE; 0.1式(3)其中,C和Mn表示钢中各元素的含量(质量%)。