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    THICK STEEL PLATE
    4.
    发明公开
    THICK STEEL PLATE 审中-公开
    DICKE STAHLPLATTE

    公开(公告)号：EP3147379A4

    公开(公告)日：2017-10-04

    申请号：EP15795946

    申请日：2015-05-15

    申请人： KK KOBE SEIKO SHO (KOBE STEEL LTD )

    发明人： SANDAIJI YUSUKE ,  KINEFUCHI MASAO ,  KAWANO HARUYA

    IPC分类号： C22C38/00 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/16 ,  C22C38/18 ,  C22C38/20 ,  C22C38/38 ,  C22C38/58

    CPC分类号： C22C38/00 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/16 ,  C22C38/18 ,  C22C38/20 ,  C22C38/38 ,  C22C38/58

    摘要： Disclosed is a steel plate. The steel plate has a chemical composition meeting predetermined conditions. A microstructure in the surface layer of the steel plate includes at least one of ferrite and upper bainite in a total fraction of 80 area percent or more, and grains of the at least one of ferrite and upper bainite have an effective grain size of 10.0 µm or less. Of the microstructure of the surface layer, grains of the remainder microstructure excluding the ferrite and the upper bainite have an average equivalent circle diameter of 3.0 pm or less. The steel plate has a dislocation density Á of 2.5×10 15 m -1 or less as determined by X-ray diffractometry. The steel plate having the configuration has excellent fatigue properties.

    摘要翻译： 公开了一种钢板。 钢板具有符合预定条件的化学成分。 钢板表层的微细组织包含铁素体和上贝氏体中的至少一种，其总面积率为80面积％以上，铁素体和上贝氏体中的至少一种的晶粒的有效粒径为10.0μm 或更少。 在表面层的组织中，除铁素体和上贝氏体以外的剩余组织的晶粒的平均当量圆直径为3.0μm以下。 通过X射线衍射测定，钢板的位错密度ρ为2.5×10 15 m -1以下。 具有该构造的钢板具有优异的疲劳性能。

    THICK STEEL SHEET HAVING EXCELLENT FATIGUE PROPERTIES, AND METHOD FOR PRODUCING SAME
    6.
    发明公开
    THICK STEEL SHEET HAVING EXCELLENT FATIGUE PROPERTIES, AND METHOD FOR PRODUCING SAME 有权
    DICKES STAHLBLECH MIT HERVORRAGENDENERMÜDUNGSEIGENSCHAFTENUND VERFAHREN ZUR HERSTELLUNG DAVON

    公开(公告)号：EP3040436A4

    公开(公告)日：2017-04-26

    申请号：EP14840332

    申请日：2014-08-21

    申请人： KK KOBE SEIKO SHO (KOBE STEEL LTD )

    发明人： SANDAIJI YUSUKE ,  KINEFUCHI MASAO ,  KAWANO HARUYA ,  KANEKO MASAHITO

    IPC分类号： C22C38/00 ,  B21B1/38 ,  C21D8/02 ,  C22C38/58

    CPC分类号： C22C38/00 ,  C21D8/02 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/002 ,  C21D2211/004 ,  C22C38/58

    摘要： A thick steel sheet according to the present invention satisfies a predetermined chemical composition, wherein the metallic structure meets requirements (a) to (d) as mentioned below when determined at an observation point that is located at the depth of 3 mm from the surface of the steel sheet on the vertical cross-sectional view that is taken in a direction parallel to the rolling direction, and wherein precipitates meet requirement (A) as mentioned below: (a) the metallic structure is composed of a bainitic structure and a remainder structure that is harder than the bainite, wherein the bainitic fraction in the whole structure is 80% by area or more; (b) the average length of crystal grains of bainite is 7 µm or less as observed in the direction of the thickness of the crystal grain when the crystal grain of bainite is determined on the basis of the high-angle grain boundary having an orientation difference between adjacent crystals of 15° or more; (c) the harder remainder structure has an equivalent circle diameter of 3 µm or less; (d) the difference between the hardness of the bainite and the hardness of the harder remainder structure (i.e., [the hardness of the harder remainder structure] - [the hardness of the bainite]) is Hv 100 or more; and (A) the number of precipitates each containing at least one of Nb, Ti and V and each having an equivalent circle diameter of 20 nm or less is 100/µm 2 or more.

    摘要翻译： 根据本发明的厚钢板满足预定的化学组成，其中当在位于离表面3mm深度的观察点处确定时，金属结构满足如下所述的要求（a）至（d） 在与轧制方向平行的方向上截取的纵截面图中的钢板，其中，析出物满足下述要件（A）：（a）金属组织由贝氏体组织和余量组织构成 比贝氏体硬，其中整个结构中的贝氏体分数为80面积％或更多; （b）当基于具有取向差的高角度晶界确定贝氏体的晶粒时，在沿晶粒的厚度方向观察时，贝氏体的晶粒的平均长度为7μm或更小 在15°或更大的相邻晶体之间; （c）较硬的余量结构具有3μm或更小的当量圆直径; （d）贝氏体的硬度与硬质余量组织的硬度之差（即，较硬的剩余组织的硬度 - 贝氏体的硬度）为Hv100以上， （A）各自含有Nb，Ti和V中的至少一种且当量圆直径为20nm以下的析出物的个数为100个/μm2以上。

    STEEL PLATE HAVING EXCELLENT HYDROGEN-INDUCED-CRACKING RESISTANCE AND TOUGHNESS, AND STEEL TUBE FOR LINE PIPE
    10.
    发明公开
    STEEL PLATE HAVING EXCELLENT HYDROGEN-INDUCED-CRACKING RESISTANCE AND TOUGHNESS, AND STEEL TUBE FOR LINE PIPE 审中-公开
    具有优良的耐氢致开裂韧性及LINE钢管钢板

    公开(公告)号：EP3018231A4

    公开(公告)日：2017-03-22

    申请号：EP14819986

    申请日：2014-06-25

    申请人： KK KOBE SEIKO SHO (KOBE STEEL LTD )

    发明人： KATO TAKU ,  KAWANO HARUYA

    IPC分类号： C22C38/00 ,  C21C7/00 ,  C21C7/04 ,  C21C7/10 ,  C21D8/02 ,  C22C38/06 ,  C22C38/58

    CPC分类号： C22C38/06 ,  C21C7/04 ,  C21C7/10 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/004 ,  C22C38/04 ,  C22C38/58

    摘要： The present invention provides a steel plate having demonstrably excellent hydrogen-induced cracking resistance and toughness. The steel plate is characterized in including, in percent by mass, 0.02-0.15% of C, 0.02-0.50% of Si, 0.6-2.0% of Mn, more than 0% and up to 0.030% of P, more than 0% and up to 0.003% of S, 0.010-0.08% of Al, 0.0003-0.0060% of Ca, 0.001-0.01% of N, and more than 0% and no more than 0.0045% of O, the balance comprising iron and unavoidable impurities; the mass ratio of Ca to S (Ca/S) being at least 2.0; the amounts of Ca, S, and O satisfying the equation (Ca-1.25 S)/O‰¤1.80; and the Ar gas content of the steel being no greater than 0.5 µL/cm 3 .

    摘要翻译： 本发明提供具有优异的demonstrably氢致开裂性和韧性的钢板。 钢板的特征在于，包括，以质量％计，0时02分至0：15％的C，0时02分至0：50％的Si，Mn为0.6-2.0％，超过0％且至多P的0.030％，大于0％ 和高达S 0.003％以下，Al的0.010-0.08％以下，Ca的0.0003-0.0060％以下，N 0.001-0.01％，并且大于0％和O，余量为铁和不可避免的杂质，其包括不超过0.0045％ ; Ca与S（钙/ S）为至少2.0的质量比; 钙，S和O的含量满足等式（钙1.25 S）/O‰¤1.80; 和钢是不大于0.5微升/ cm 3以下的Ar气含量。