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    HIGH TENSILE HOT ROLLED STEEL SHEET EXCELLENT IN SHAPE FREEZING PROPERTY AND ENDURANCE FATIGUE CHARACTERISTICS AFTER FORMING
    2.
    发明公开
    HIGH TENSILE HOT ROLLED STEEL SHEET EXCELLENT IN SHAPE FREEZING PROPERTY AND ENDURANCE FATIGUE CHARACTERISTICS AFTER FORMING 有权
    HOCHZUGFESTES WARMGEWALZTES STAHLBLECH MIT HERVORRAGENDER MASSHALTIGKEIT UND HERVORRAGENDEN DAUERFESTIGKEITSEIGENSCHAFTEN NACH DEM FORMEN

    公开(公告)号：EP1398392A4

    公开(公告)日：2004-12-15

    申请号：EP02733285

    申请日：2002-06-04

    Applicant: JFE STEEL CORP

    Inventor： MEGA TETSUYA ,  SAKATA KEI ,  SETO KAZUHIRO

    IPC: C21D9/46 ,  C21D8/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/38 ,  C22C38/14 ,  C22C38/22

    CPC classification number: C21D9/34 ,  C21D8/0263 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12

    Abstract: A high tensile hot rolled steel sheet which has a chemical composition, in mass %: C: 0.02 to 0.2 %, Si: 0.5 to 2.0 %, Mn: 1.0 to 3.0 %, Mo: 0.1 to 0.6 %, Al: 0.01 to 0.1 %, N: 0.002 to 0.006 %, P: 0.03 % or less, S: 0.01 % or less, solid−dissolved (C + N): 0.0010 % or more, balance: Fe and inevitable impurities, and has a steel structure, wherein a primary phase is ferrite, a secondary phase is martensite present in an amount of 5 to 30 %, and the two phases account in total for 95 vol % thereof, and wherein the ferrite phase has an average crystal grain size of 8 μm or less. The hot rolled steel sheet has a tensile strength of the 590 MPa level or more, and exhibits excellent shape freezing property with no further treatment and also is excellent in endurance fatigue characteristics after forming, weldability and capability of being chemically treated.

    Abstract translation: 1。一种高强度热轧钢板，其特征在于，以质量％计含有C：0.02〜0.2％，Si：0.5〜2.0％，Mn：1.0〜3.0％，Mo：0.1〜0.6％，Al：0.01〜0.1 ，N：0.002〜0.006％，P：0.03％以下，S：0.01％以下，固溶（C + N）：0.0010％以上，余量由Fe和不可避免的杂质构成， 其中，主相是铁素体，第二相是以5〜30％的量存在的马氏体，并且两相占总共95vol％，并且其中铁素体相的平均晶粒尺寸为8μm或者 减。 热轧钢板具有590MPa水平或更高的拉伸强度，并且在没有进一步处理时表现出优异的形状冻结性能，并且在成形后的耐久疲劳特性，焊接性和化学处理能力方面优异。

    HOT-ROLLED STEEL SHEET WITH HIGH TENSILE STRENGTH AND SUPERIOR PROCESSABILITY AND METHOD FOR PRODUCING SAME
    3.
    发明公开
    HOT-ROLLED STEEL SHEET WITH HIGH TENSILE STRENGTH AND SUPERIOR PROCESSABILITY AND METHOD FOR PRODUCING SAME 审中-公开

    公开(公告)号：EP2554706A4

    公开(公告)日：2017-12-06

    申请号：EP11762273

    申请日：2011-03-30

    Applicant: JFE STEEL CORP

    Inventor： ARIGA TAMAKO ,  NAKAJIMA KATSUMI ,  MEGA TETSUYA

    IPC: C22C38/14 ,  C21D8/02 ,  C21D9/46 ,  C22C38/12 ,  C22C38/38

    CPC classification number: C21D8/0226 ,  C21D8/0426 ,  C21D8/0463 ,  C21D9/48 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/24 ,  C22C38/28 ,  C22C38/38

    Abstract: An object of the present invention is to provide a high tensile strength hot rolled steel sheet having sufficiently high strength and excellent formability (elongation and stretch-flange ability), as well as a method for manufacturing the hot rolled steel sheet. Specifically, the present invention provides a high tensile strength hot rolled steel sheet having tensile strength of at least 980 MPa and excellent formability, comprising: a composition including by mass %, C: 0.07% to 0.13% (inclusive of 0.07% and 0.13%), Si: 0.3% or less, Mn: 0.5% to 2.0% (inclusive of 0.5% and 2.0%), P: 0.025% or less, S: 0.005% or less, N: 0.0060% or less, Al: 0.06% or less, Ti: 0.08% to 0.14% (inclusive of 0.08% and 0.14%), V: 0.15% to 0.30% (inclusive of 0.15% and 0.30%), Solute V: 0.04% to 0.1% (inclusive of 0.04% and 0.1%), Solute Ti: 0.05% or less, and remainder consisting of Fe and incidental impurities; (ii) microstructure with fine carbides dispersion precipitated therein, the fine carbides containing Ti and V and having the average particle diameter of less than 10 nm, as well as volume ratio with respect to the entire microstructure of at least 0.007; and matrix as ferrite phase having area ratio with respect to the entire microstructure of at least 97%, wherein contents of C, Ti, V, S and N satisfy formula (1) and formula (2) below. Ti ‰¥ 0.08 + N / 14 × 48 + S / 32 × 48 0.8 ‰¤ Ti / 48 + V / 51 / C / 12 ‰¤ 1.2 In formulae (1) and (2), "C", "Ti", "V", "S" and "N" represent contents (mass %) of corresponding elements, respectively. Bending properties of the hot rolled steel sheet is further improves by setting the total content of the solute V and the solute Ti to be at least 0.07 mass %.

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