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    High-strength steel pipe and producing method thereof
    1.
    发明申请
    High-strength steel pipe and producing method thereof 有权
    高强度钢管及其制造方法

    公开(公告)号：US20120118425A1

    公开(公告)日：2012-05-17

    申请号：US13261070

    申请日：2010-06-10

    申请人： Kensuke Nagai ,  Yasuhiro Shinohara ,  Shinya Sakamoto ,  Takuya Hara ,  Hitoshi Asahi

    发明人： Kensuke Nagai ,  Yasuhiro Shinohara ,  Shinya Sakamoto ,  Takuya Hara ,  Hitoshi Asahi

    IPC分类号： F16L9/14 ,  C21D9/08

    CPC分类号： C22C38/04 ,  C21D8/02 ,  C21D9/08 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

    摘要： This high-strength steel pipe includes, by mass%, C: 0.02% to 0.09%, Mn: 0.4% to 2.5%, Cr: 0.1% to 1.0%, Ti: 0.005% to 0.03%, Nb: 0.005% to 0.3%, and a balance consisting of Fe and inevitable impurities, in which Si, Al, P, S, and N are limited to 0.6% or less, 0.1% or less, 0.02% or less, 0.005% or less, 0.008% or less, respectively, the bainite transformation index BT is 650° C. or less, and the microstructure thereof is a single bainite microstructure including first bainite and second bainite, the first bainite being a gathered microstructure of bainitic ferrite including no carbide, and the second bainite being a mixed microstructure of bainitic ferrite including no carbide and cementite between the bainitic ferrites.

    摘要翻译： 该高强度钢管以质量％计含有C：0.02％〜0.09％，Mn：0.4〜2.5％，Cr：0.1〜1.0％，Ti：0.005〜0.03％，Nb：0.005〜0.3 ％，余量由Fe和不可避免的杂质组成，其中Si，Al，P，S和N分别为0.6％以下，0.1％以下，0.02％以下，0.005％以下，0.008％以下 贝氏体相变指数BT分别为650℃以下，其微结构为包括第一贝氏体和第二贝氏体的单贝氏体组织，第一贝氏体为不含碳化物的贝氏体铁素体的集聚组织，第二贝氏体组织 贝氏体是贝氏体铁素体之间不含碳化物和渗碳体的贝氏体铁素体的混合微观结构。

    High-strength steel pipe and producing method thereof
    2.
    发明授权
    High-strength steel pipe and producing method thereof 有权
    高强度钢管及其制造方法

    公开(公告)号：US08685182B2

    公开(公告)日：2014-04-01

    申请号：US13261070

    申请日：2010-06-10

    申请人： Kensuke Nagai ,  Yasuhiro Shinohara ,  Shinya Sakamoto ,  Takuya Hara ,  Hitoshi Asahi

    发明人： Kensuke Nagai ,  Yasuhiro Shinohara ,  Shinya Sakamoto ,  Takuya Hara ,  Hitoshi Asahi

    IPC分类号： C22C38/48 ,  C22C38/50 ,  C21D8/10

    CPC分类号： C22C38/04 ,  C21D8/02 ,  C21D9/08 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

    摘要： This high-strength steel pipe includes, by mass %, C: 0.02% to 0.09%, Mn: 0.4% to 2.5%, Cr: 0.1% to 1.0%, Ti: 0.005% to 0.03%, Nb: 0.005% to 0.3%, and a balance consisting of Fe and inevitable impurities, in which Si, Al, P, S, and N are limited to 0.6% or less, 0.1% or less, 0.02% or less, 0.005% or less, 0.008% or less, respectively, the bainite transformation index BT is 650° C. or less, and the microstructure thereof is a single bainite microstructure including first bainite and second bainite, the first bainite being a gathered microstructure of bainitic ferrite including no carbide, and the second bainite being a mixed microstructure of bainitic ferrite including no carbide and cementite between the bainitic ferrites.

    摘要翻译： 该高强度钢管以质量％计含有C：0.02％〜0.09％，Mn：0.4〜2.5％，Cr：0.1〜1.0％，Ti：0.005〜0.03％，Nb：0.005〜0.3 ％，余量由Fe和不可避免的杂质组成，其中Si，Al，P，S和N分别为0.6％以下，0.1％以下，0.02％以下，0.005％以下，0.008％以下 贝氏体相变指数BT分别为650℃以下，其微观结构为包括第一贝氏体和第二贝氏体的单贝氏体组织，第一贝氏体为不含碳化物的贝氏体铁素体的集聚组织，第二贝氏体组织 贝氏体是贝氏体铁素体之间不含碳化物和渗碳体的贝氏体铁素体的混合微观结构。

    High-strength steel sheet and high-strength steel pipe excellent in deformability and method for producing the same
    3.
    发明授权
    High-strength steel sheet and high-strength steel pipe excellent in deformability and method for producing the same 有权
    可变形性优异的高强度钢板和高强度钢管及其制造方法

    公开(公告)号：US08070887B2

    公开(公告)日：2011-12-06

    申请号：US10410014

    申请日：2003-04-09

    申请人： Hitoshi Asahi ,  Yasuhiro Shinohara ,  Takuya Hara

    发明人： Hitoshi Asahi ,  Yasuhiro Shinohara ,  Takuya Hara

    IPC分类号： C21D9/08 ,  C22C38/00 ,  C22C38/18

    CPC分类号： C22C38/04 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/02 ,  C22C38/12 ,  C22C38/14

    摘要： The present invention provides a line pipe of, e.g., the API standard X60 to X100 class. The line pipe has an excellent deformability, as well as excellent low temperature toughness and high productivity, a steel plate used as the material of the steel pipe. Methods for producing the steel pipe and the steel plate are also provided. In particular, a high-strength steel plate excellent in the deformability has a ferrite phase is dispersed finely, and accounts for 5% to 40% in area percentage in a low temperature transformation structure mainly composed of a bainite phase. For example, most grain sizes of the ferrite phase are smaller than the average grain size of the bainite phase. A high-strength steel pipe excellent in deformability is also provided, in which a large diameter steel pipe is produced through forming the steel plate into a pipe shape. The steel pipe has the above-referenced structure, and satisfies the conditions that YS/TS is 0.95 or less and YS×uEL is 5,000 or more. Methods for producing such steel plate and steel pipe are also provided.

    摘要翻译： 本发明提供了例如API标准X60至X100类的管线管。 线管具有优异的变形性，以及优异的低温韧性和高生产率，用作钢管材料的钢板。 还提供了生产钢管和钢板的方法。 特别是，在主要由贝氏体相组成的低温转变结构中，变形性优异的高强度钢板的铁素体相分散细小，占面积率的5〜40％。 例如，铁素体相的大部分晶粒尺寸小于贝氏体相的平均晶粒尺寸。 还提供了一种变形能力优异的高强度钢管，其中通过将钢板形成管状而制造大直径钢管。 钢管具有上述结构，满足YS / TS为0.95以下，YS×uEL为5000以上的条件。 还提供了生产这种钢板和钢管的方法。

    High Strength Steel Plate and High Strength Welded Pipe Excellent in Ductile Fracture Characteristic and Methods of Production of Same
    4.
    发明申请
    High Strength Steel Plate and High Strength Welded Pipe Excellent in Ductile Fracture Characteristic and Methods of Production of Same 有权
    高强度钢板和高强度焊接管优异的韧性断裂特性及其生产方法

    公开(公告)号：US20090025835A1

    公开(公告)日：2009-01-29

    申请号：US11887885

    申请日：2005-04-19

    申请人： Takuya Hara ,  Yasuhiro Shinohara ,  Hitoshi Asahi ,  Yoshio Terada

    发明人： Takuya Hara ,  Yasuhiro Shinohara ,  Hitoshi Asahi ,  Yoshio Terada

    IPC分类号： C21D9/08 ,  C22C38/04 ,  C22C38/08 ,  C22C38/20 ,  C22C38/32 ,  C22C38/44

    CPC分类号： C22C38/02 ,  C21D8/0205 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/42 ,  C22C38/44 ,  C22C38/58

    摘要： The present invention provides high strength steel plate and high strength welded pipe excellent in ductile fracture characteristic and methods of production of the same, that is, high strength steel plate excellent in ductile fracture characteristic, and high strength welded pipe using that steel plate as a base material, having a tensile strength corresponding to the X100 class of the API standard, containing, by mass %, C: 0.01 to 0.5%, Si: 0.01 to 3%, Mn: 0.1 to 5%, P: 0.03% or less, and S: 0.03% or less and a balance of Fe and unavoidable impurities, having a microstructure comprised of, by area ratio, 1 to 60% of ferrite and the balance of bainite and martensite, having a maximum value of the {100} accumulation degree of the cross-section rotated 20 to 50° from the plate thickness cross-section about the rolling direction as an axis of 3 or less, and having plate thickness parallel cracks measured by ultrasonic flaw detection of less than 1 mm.

    摘要翻译： 本发明提供了具有优异的延性断裂特性的高强度钢板和高强度焊接管及其制造方法，即延性断裂特性优异的高强度钢板，以及使用该钢板作为 基材，具有对应于API标准的X100等级的拉伸强度，以质量％计含有C：0.01〜0.5％，Si：0.01〜3％，Mn：0.1〜5％，P：0.03％以下 ，S：0.03％以下，余量为Fe和不可避免的杂质，其微结构由面积比为1〜60％的铁素体和余量的贝氏体和马氏体构成，其最大值为{100} 横截面从作为轴线的轧制方向的板厚横截面旋转20至50°的横截面的累积度为3以下，并且通过超声波探伤小于1mm测量的板厚平行裂纹。

    High strength steel plate and high strength welded pipe excellent in ductile fracture characteristic and methods of production of same
    5.
    发明授权
    High strength steel plate and high strength welded pipe excellent in ductile fracture characteristic and methods of production of same 有权
    高强度钢板和高强度焊接管优良的延性断裂特性及其生产方法

    公开(公告)号：US08715430B2

    公开(公告)日：2014-05-06

    申请号：US11887885

    申请日：2005-04-19

    申请人： Takuya Hara ,  Yasuhiro Shinohara ,  Hitoshi Asahi ,  Yoshio Terada

    发明人： Takuya Hara ,  Yasuhiro Shinohara ,  Hitoshi Asahi ,  Yoshio Terada

    IPC分类号： C22C38/00

    CPC分类号： C22C38/02 ,  C21D8/0205 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/42 ,  C22C38/44 ,  C22C38/58

    摘要： The present invention provides high strength steel plate and high strength welded pipe excellent in ductile fracture characteristic and methods of production of the same, that is, high strength steel plate excellent in ductile fracture characteristic, and high strength welded pipe using that steel plate as a base material, having a tensile strength corresponding to the X100 class of the API standard, containing, by mass %, C: 0.01 to 0.5%, Si: 0.01 to 3%, Mn: 0.1 to 5%, P: 0.03% or less, and S: 0.03% or less and a balance of Fe and unavoidable impurities, having a microstructure comprised of, by area ratio, 1 to 60% of ferrite and the balance of bainite and martensite, having a maximum value of the {100} accumulation degree of the cross-section rotated 20 to 50° from the plate thickness cross-section about the rolling direction as an axis of 3 or less, and having plate thickness parallel cracks measured by ultrasonic flaw detection of less than 1 mm.

    摘要翻译： 本发明提供了具有优异的延性断裂特性的高强度钢板和高强度焊接管及其制造方法，即延性断裂特性优异的高强度钢板，以及使用该钢板作为 基材，具有对应于API标准的X100等级的拉伸强度，以质量％计含有C：0.01〜0.5％，Si：0.01〜3％，Mn：0.1〜5％，P：0.03％以下 ，S：0.03％以下，余量为Fe和不可避免的杂质，其微结构由面积比为1〜60％的铁素体和余量的贝氏体和马氏体构成，其最大值为{100} 横截面从作为轴线的轧制方向的板厚横截面旋转20至50°的横截面的累积度为3以下，并且通过超声波探伤小于1mm测量的板厚平行裂纹。