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    HIGH-STRENGTH STEEL SHEET WITH EXCELLENT PROCESSABILITY AND PROCESS FOR PRODUCING SAME
    2.
    发明公开
    HIGH-STRENGTH STEEL SHEET WITH EXCELLENT PROCESSABILITY AND PROCESS FOR PRODUCING SAME 审中-公开
    HOCHFESTES STAHLBLECH MIT AUSGEZEICHNETER VERARBEITBARKEIT UND VERFAHREN ZUR HERSTELLUNG DAVON

    公开(公告)号：EP2589678A4

    公开(公告)日：2017-07-19

    申请号：EP11801026

    申请日：2011-06-29

    申请人： JFE STEEL CORP

    发明人： KAWAMURA KENJI ,  KAWABE HIDETAKA ,  SETO KAZUHIRO ,  KATAYAMA NORIYUKI

    IPC分类号： C22C38/06 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C22C38/54

    CPC分类号： C21D8/0263 ,  C21D8/0226 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18

    摘要： A thin high strength steel sheet having excellent formability and a method for manufacturing the sheet are provided. A hot rolling step of hot-rolling a steel having a composition which includes, by mass%, 0.08 to 0.15% of C, 0.5 to 1.5% of Si, 0.5 to 1.5% of Mn, 0.01 to 0.1% of Al, and 0.005% or less of N to form a hot rolled sheet is conducted. After the hot-rolled sheet is pickled, the hot rolled sheet is subjected to an annealing treatment of holding the hot rolled sheet in a first temperature region of an A c1 transformation point to an A c3 transformation point for 5 to 400 s by a continuous annealing line without cold rolling; and to a cooling treatment of cooling the sheet at an average cooling rate of 5°C/s or higher from the first temperature region to 700°C and adjusting a residence time in a second temperature region of 700°C to 400°C in the range of 30 to 400 s. As a result, a microstructure composed of a ferrite phase having an area fraction in the range of 75 to 90% with respect to the entire microstructure and a second phase including pearlite, the second phase having an area fraction in the range of 10 to 25% can be obtained. The pearlite accounts for 70% or more in terms of the area fraction with respect to the entire second phase and the average grain size of the pearlite is 5 µm or smaller. Thus, a high strength steel sheet with excellent formability having a high strength, i.e., a tensile strength TS of 540 MPa or more, excellent elongation, and excellent stretch flangeability can be obtained.

    摘要翻译： 提供一种具有优良可成形性的薄高强度钢板及其制造方法。 以质量％计含有C：0.08〜0.15％，Si：0.5〜1.5％，Mn：0.5〜1.5％，Al：0.01〜0.1％，和0.005％ 进行形成热轧板的N的％以下。 在热轧板酸洗后，对热轧板进行退火处理，将热轧板在A c1相变点的第一温度范围内保持在A c 3相变点5〜400s， 无冷轧退火线; 以5℃/秒以上的平均冷却速度从第一温度区域冷却至700℃，并且在700℃至400℃的第二温度区域中调整停留时间的冷却处理 范围在30到400秒之间。 结果，由相对于全部组织的面积率为75〜90％的铁素体相和含有珠光体的第2相构成的显微组织，第2相的面积率为10〜25 ％ 可以获得。 以相对于整个第二相的面积分数计，珠光体占70％以上，珠光体的平均粒径为5μm以下。 因此，可以获得强度高，即拉伸强度TS为540MPa以上，伸长率优异，延伸凸缘性优异的成形性优异的高强度钢板。

    HIGH-STRENGTH HOT-ROLLED STEEL PLATE WITH GOOD DUCTILITY, STRETCH FLANGEABILITY AND MATERIAL QUALITY UNIFORMITY, AND PROCESS FOR MANUFACTURING SAME
    5.
    发明公开
    HIGH-STRENGTH HOT-ROLLED STEEL PLATE WITH GOOD DUCTILITY, STRETCH FLANGEABILITY AND MATERIAL QUALITY UNIFORMITY, AND PROCESS FOR MANUFACTURING SAME 有权
    导电性高的高强度热延钢板，拉伸弹性及其制造和一致的材质和方法

    公开(公告)号：EP2843075A4

    公开(公告)日：2016-02-24

    申请号：EP12875169

    申请日：2012-04-26

    申请人： JFE STEEL CORP

    发明人： KOSAKA NORIAKI ,  SETO KAZUHIRO ,  KAWABE HIDETAKA

    IPC分类号： C22C38/14 ,  C21D8/02 ,  C21D8/04 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

    CPC分类号： C22C38/14 ,  B32B15/013 ,  C21D8/0263 ,  C21D8/0426 ,  C21D8/0463 ,  C21D9/46 ,  C21D2211/004 ,  C21D2211/005 ,  C22C18/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

    摘要： The present invention provides a hot-rolled steel sheet having high strength and excellent ductility and stretch flangeability, and good uniformity of material in which the variation in strength in a coil is small, and a method for manufacturing the same. A slab having a steel composition including 0.020% to 0.065% of C, 0.1% or less of Si, 0.40% to less than 0.80% of Mn, 0.030% or less of P, 0.005% or less of S, 0.08% to 0.16% of Ti, 0.005% to 0.1% of Al, 0.005% or less of N, and the balance being Fe and incidental impurities, in which Ti* (= Ti - (48/14) x N) satisfies [TiC* ‰¥ 0.08] and [0.300 ‰¤ C/Ti* ‰¤ 0.375], is subjected to hot rolling to obtain a hot-rolled steel sheet in which the steel microstructure includes, in terms of area fraction, 95% or more of a ferrite phase; the average ferrite grain size is 10 µm or less; the average grain size of Ti carbides precipitated in steel is 10 nm or less; and Ti in the amount of 80% or more of Ti* is precipitated as Ti carbides.

    摘要翻译： 本发明提供了具有高强度和优异的延展性和拉伸凸缘，和材料，其中，在线圈的强度的变化小的良好的均匀性，和用于制造其的方法的热轧钢板。 具有钢组合物包括C为0.020％至0.065％，0.1％或更少的Si，0.40％的Mn，小于0.80％，0.030％或更少的P，0.005％或更少的S，0.08％至至0:16的钢坯 ％的Ti，0.005％与Al 0.1％，0.005％或更少的N，余量为Fe和不可避免的杂质中的Ti哪*（=钛 - （48/14）×N）个SATIS外资企业[*的TiC‰¥ 0:08]和[0300‰¤C /钛*‰¤0375]时，进行热轧，得到热轧钢板，其中，钢组织，以面积率计，铁素体相的95％或更多 ; 铁素体平均晶粒尺寸为10微米或更小; 在钢中析出的Ti碳化物的平均粒径为10nm或更小; 和Ti中的80％或更多量的Ti *的沉淀为钛碳化物。