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2124 条记录 (耗时 0.056 秒)

    Hot-rolled steel sheet and manufacturing method thereof
    82.
    发明授权
    Hot-rolled steel sheet and manufacturing method thereof 有权

    公开(公告)号：US10087499B2

    公开(公告)日：2018-10-02

    申请号：US14370158

    申请日：2012-12-27

    申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

    发明人： Hiroshi Shuto ,  Tatsuo Yokoi ,  Yuuki Kanzawa ,  Nobuhiro Fujita ,  Ryohta Niiya ,  Shinya Saitoh

    IPC分类号： C21D8/02 ,  C22C38/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  B32B15/01 ,  C22C38/08 ,  C22C38/20 ,  C22C38/26 ,  C22C38/28 ,  C21D9/46 ,  C21D1/25 ,  C23C2/02 ,  C25D5/36

    摘要： There are provided a high-strength hot-rolled steel sheet securing low-temperature toughness and having excellent stretch flangeability by controlling a structural fraction and a hardness difference among structures, and a manufacturing method thereof. A hot-rolled steel sheet contains: C: 0.01 to 0.2%; Si: 0.001 to 2.5% or less; Mn: 0.10 to 4.0% or less; P: 0.10% or less; S: less than 0.03%; Al: 0.001 to 2.0%; N: less than 0.01%; Ti: (0.005+48/14[N]+48/32[S]) % or more and 0.3% or less; Nb: 0 to 0.06%; Cu: 0 to 1.2%; Ni: 0 to 0.6%; Mo: 0 to 1%; V: 0 to 0.2%; Cr: 0 to 2%; Mg: 0 to 0.01%; Ca: 0 to 0.01%; REM: 0 to 0.1%; and B: 0 to 0.002%, and has: an texture in which, at a central portion of a sheet thickness located between ⅜ to ⅝ thickness positions of the sheet thickness from a surface of the steel sheet, an average value of X-ray random intensity ratios of a group of {100} to {223} orientations of a sheet plane is 6.5 or less and an X-ray random intensity ratio of a {332} crystal orientation is 5.0 or less; and a microstructure in which a total area ratio of tempered martensite, martensite and lower bainite is more than 85%, and an average crystal grain diameter is 12.0 μm or less.

    END STRUCTURE OF VEHICLE
    86.
    发明申请
    END STRUCTURE OF VEHICLE 审中-公开

    公开(公告)号：US20180265025A1

    公开(公告)日：2018-09-20

    申请号：US15546420

    申请日：2016-02-01

    申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

    发明人： Yutaka MIKAZUKI ,  Eiji ISOGAI ,  Kenji YAMAMOTO ,  Takashi ARIGA ,  Seiya ISHII

    IPC分类号： B60R19/56 ,  B62D21/15 ,  B60R19/24

    摘要： [Object] To improve load resistance performance in response to collision.[Solution] An end structure of a vehicle according to the present invention includes: a beam 2 that extends in a vehicle width direction; and a connecting structure 3 that connects the beam 2 to a vehicle body frame. In a cross-sectional view perpendicular to the vehicle width direction, the beam 2 includes a first top surface part 2a and a first bottom surface part 2b which face each other, a first side surface part 2c that connects one ends of the first top surface part 2a and the first bottom surface part 2b, and first flange parts 2d that are formed to protrude vertically outwardly at the other ends of the first top surface part 2a and the first bottom surface part 2b. The beam 2 is fixed to the connecting structure 3 by at least one of bonding of a protrusion 6 that is provided in the connecting structure 3 and is arranged to protrude inside the beam 2 to the first top surface part 2a and the first bottom surface part 2b and bonding of a beam attachment member provided in the connecting structure 3 to the first flange parts 2d.

    PLATED STEEL SHEET
    90.
    发明申请
    PLATED STEEL SHEET 审中-公开

    公开(公告)号：US20180245193A1

    公开(公告)日：2018-08-30

    申请号：US15753150

    申请日：2016-10-25

    申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

    发明人： Takuya MITSUNOBU

    IPC分类号： C23C2/06 ,  C23C2/40 ,  C22C18/04

    CPC分类号： C23C2/06 ,  C22C18/04 ,  C23C2/40

    摘要： An average chemical composition of a plating layer (10) and an intermetallic compound layer (30) is represented by, in terms of mass %, Al: 10% to 40%, Si: 0.05% to 4%, Mg: 0% to 5%, and the balance: Zn and impurities. The plating layer (10) includes a first structure (11) constituted from Al phases containing Zn in solid solution and Zn phases dispersed in the Al phases and having an average chemical composition represented by, in terms of mass %, Al: 25% to 50%, Zn: 50% to 75%, and impurities: less than 2%, and a eutectoid structure (14) constituted from Al phases and Zn phases and having an average chemical composition represented by, in terms of mass %, Al: 10% to 24%, Zn: 76% to 90%, and impurities: less than 2%. In a cross section of the plating layer (10), an area fraction of the first structure (11) is 5% to 40% and a total area fraction of the first structure (11) and the eutectoid structure (14) is 50% or more, an area fraction of Zn phases (15) which are structures containing 90% or more of Zn, contained in the plating layer (10) is 25% or less, a total area fraction of intermetallic compound phases contained in the plating layer (10) is 9% or less, and a thickness of the intermetallic compound layer (30) is 2 μm or less.