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    HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING THE SAME (AS AMENDED)
    2.
    发明申请
    HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING THE SAME (AS AMENDED) 审中-公开
    热轧钢板及其制造方法（如修改）

    公开(公告)号：US20160017466A1

    公开(公告)日：2016-01-21

    申请号：US14781762

    申请日：2014-03-20

    申请人： JFE STEEL CORPORATION

    发明人： Tomoaki Shibata ,  Sota Goto

    IPC分类号： C22C38/38 ,  C21D9/46 ,  C21D6/00 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02

    CPC分类号： C22C38/38 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/021 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/46 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28

    摘要： A hot-rolled steel sheet is provided having high strength and excellent toughness and ductility includes a composition that contains, on a mass percent basis, 0.04% or more and 0.15% or less of C, 0.01% or more and 0.55% or less of Si, 1.0% or more and 3.0% or less of Mn, 0.03% or less P, 0.01% or less S, 0.003% or more and 0.1% or less of Al, 0.006% or less N, 0.035% or more and 0.1% or less Nb, 0.001% or more and 0.1% or less of V, 0.001% or more and 0.1% or less Ti, and the balance being Fe and incidental impurities, in which the hot-rolled steel sheet includes a microstructure in which the proportion of precipitated Nb to the total amount of Nb is 35% or more and 80% or less, the volume fraction of tempered martensite and/or tempered bainite having a lath interval of 0.2 μm or more and 1.6 μm or less is 95% or more at a position 1.0 mm from a surface of the sheet in the thickness direction, and the volume fraction of ferrite having a lath interval of 0.2 μm or more and 1.6 μm or less at the center position of the sheet in the thickness direction is 95% or more.

    摘要翻译： 提供了具有高强度和优异的韧性和延展性的热轧钢板，其包含以质量百分比计含有0.04％以上且0.15％以下的C，0.01％以上且0.55％以下的组合物 Si为1.0％以上且3.0％以下，Mn为0.03％以下，P为0.01％以下，S：0.003％以上且0.1％以下，N：0.006％以下，N：0.035％以上0.1以下 Nb％以下，Nb：0.001％以上，0.1％以下，Ti：0.001％以上且0.1％以下，余量由Fe及杂质组成，其中， 析出的Nb相对于Nb的总量的比例为35％以上且80％以下，具有0.2μm以上且1.6μm以下的板条间隔的回火马氏体和/或回火贝氏体的体积分率为95％ 以上，厚度方向与片材的表面1.0mm的位置，具有0.2μm以上且1.6μm以上的板条间隔的铁素体的体积分数 在纸张的厚度方向的中心位置处的r小于95％以上。

    Hot-rolled steel sheet and method for producing the same
    5.
    发明授权
    Hot-rolled steel sheet and method for producing the same 有权

    公开(公告)号：US10287661B2

    公开(公告)日：2019-05-14

    申请号：US14781762

    申请日：2014-03-20

    申请人： JFE STEEL CORPORATION

    发明人： Tomoaki Shibata ,  Sota Goto

    IPC分类号： C21D8/02 ,  C22C38/38 ,  C22C38/00 ,  C22C38/14 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C21D6/00

    摘要： A hot-rolled steel sheet is provided having high strength and excellent toughness and ductility includes a composition that contains, on a mass percent basis, 0.04% or more and 0.15% or less of C, 0.01% or more and 0.55% or less of Si, 1.0% or more and 3.0% or less of Mn, 0.03% or less P, 0.01% or less S, 0.003% or more and 0.1% or less of Al, 0.006% or less N, 0.035% or more and 0.1% or less Nb, 0.001% or more and 0.1% or less of V, 0.001% or more and 0.1% or less Ti, and the balance being Fe and incidental impurities, in which the hot-rolled steel sheet includes a microstructure in which the proportion of precipitated Nb to the total amount of Nb is 35% or more and 80% or less, the volume fraction of tempered martensite and/or tempered bainite having a lath interval of 0.2 μm or more and 1.6 μm or less is 95% or more at a position 1.0 mm from a surface of the sheet in the thickness direction, and the volume fraction of ferrite having a lath interval of 0.2 μm or more and 1.6 μm or less at the center position of the sheet in the thickness direction is 95% or more.

    HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME
    7.
    发明申请
    HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME 有权

    公开(公告)号：US20230140191A1

    公开(公告)日：2023-05-04

    申请号：US17910421

    申请日：2021-03-17

    申请人： JFE Steel Corporation

    发明人： Hiroshi Hasegawa ,  Hideyuki Kimura ,  Noriaki Moriyasu ,  Sota Goto

    IPC分类号： C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  B21C47/02

    摘要： After low-temperature finish rolling has been performed on a steel material having a certain chemical composition, cooling is performed at an average cooling rate of 10° C./s or higher to a temperature of 500° C., rapid cooling is further performed in a temperature range from a Ms temperature to a temperature of (Ms temperature - 200° C.), coiling is thereafter performed in a low temperature range of 250° C. or lower, and the coiled steel sheet is uncoiled and further subjected to rolling with a certain amount or more of rolling load per unit width and the like. Consequently, it is possible to obtain a high-strength hot-rolled steel sheet having a microstructure including, in terms of area fraction, 95% or more of a martensite phase at a position located at ¼ of the thickness of the steel sheet, in which an average aspect ratio of prior austenite grains is 3.0 or more.