公开(公告)号：US20090044882A1

公开(公告)日：2009-02-19

申请号：US11921349

申请日：2006-06-09

Applicant: Hitoshi Asahi ,  Taro Muraki ,  Hideyuki Nakamura ,  Eiji Tsuru

Inventor： Hitoshi Asahi ,  Taro Muraki ,  Hideyuki Nakamura ,  Eiji Tsuru

IPC: C21D9/08 ,  C22C38/00

CPC classification number: C22C38/002 ,  C21D1/22 ,  C21D1/25 ,  C21D9/14 ,  C21D9/50 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

Abstract: The invention provides an oil well pipe for expandable tubular applications excellent in post-expansion toughness and a method of manufacturing the oil well pipe. The oil well pipe for expandable tubular applications comprises, in mass %, C: 0.03 to 0.14%, Si: 0.8% or less, Mn: 0.3 to 2.5%, P: 0.03% or less, S: 0.01% or less, Ti: 0.005 to 0.03%, Al: 0.1% or less, N: 0.001 to 0.01%, B: 0.0005 to 0.003%, optionally comprises one or move of Nb, Ni, Mo, Cr, Cu and V, and further optionally comprises one or both of Ca and REM, satisfies the relationship A=2.7C+0.4Si+Mn+0.45Ni+0.45Cu+0.8Cr+2Mo≧1.8, has a balance of iron and unavoidable impurities, and is formed of tempered martensite structure. The manufacturing method according to the invention is characterized in subjecting a steel stock pipe of the foregoing composition to hardening from a temperature range of Ac3 point+30° C. or greater and to tempering at a temperature of 350 to 720° C.

Abstract translation: 本发明提供了一种用于后膨胀韧性优异的可膨胀管状应用的油井管和一种制造油井管的方法。 可膨胀管状的油井管以质量％计含有C：0.03〜0.14％，Si：0.8％以下，Mn：0.3〜2.5％，P：0.03％以下，S：0.01％以下，Ti ：0.005〜0.03％，Al：0.1％以下，N：0.001〜0.01％，B：0.0005〜0.003％，任选地包含Nb，Ni，Mo，Cr，Cu和V中的一种或多种， 或Ca和REM两者满足A = 2.7C + 0.4Si + Mn + 0.45Ni + 0.45Cu + 0.8Cr + 2Mo> = 1.8的关系，其余为铁和不可避免的杂质，并且由回火马氏体组织形成 。 根据本发明的制造方法的特征在于，将上述组成的钢坯管从Ac 3点+ 30℃以上的温度范围进行硬化，并在350〜720℃的温度下回火。

公开(公告)号：US07892368B2

公开(公告)日：2011-02-22

申请号：US10515543

申请日：2003-05-23

Applicant: Eiji Tsuru ,  Hitoshi Asahi

Inventor： Eiji Tsuru ,  Hitoshi Asahi

IPC: C21D9/08 ,  F16L9/00

CPC classification number: C22C38/02 ,  B21C37/065 ,  B21C37/08 ,  B21C37/0822 ,  B21C37/0826 ,  C21D9/08 ,  C21D9/50 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  Y10T29/18

Abstract: The present invention relates to UOE steel pipe excellent in collapse characteristics formed by the UOE production method and a method for forming this UOE steel pipe, said UOE steel pipe characterized in that a ratio between compression and tension of yield strength in the circumferential direction is at least 1.05 near the inside surface and is at least 0.9 to not more to 1.0 from the center of plate thickness to the outside surface.

公开(公告)号：US07459033B2

公开(公告)日：2008-12-02

申请号：US10518663

申请日：2003-06-12

Applicant: Hitoshi Asahi ,  Eiji Tsuru

Inventor： Hitoshi Asahi ,  Eiji Tsuru

IPC: C22C38/12 ,  C22C38/14

CPC classification number: B21C37/08 ,  C21D8/10 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  Y10S148/909

Abstract: The present invention provides a method of production of oil country tubular goods having a small drop in collapse pressure after expansion and having a collapse pressure recovering by low temperature ageing at about 100° C. and oil country tubular goods obtained by this method of production.This method of production comprises hot rolling a steel slab having amounts of addition of C, Mn, P, S, Nb, Ti, Al, and N in specific ranges and having a balance of iron and unavoidable impurities and shaping the steel strip coiled at a temperature of not more than 300° C. as it is into a tube. Alternatively, it comprises heating steel pipe having amounts of addition of C, Mn, P, S, Nb, Ti, Al, and N in specific ranges and having a balance of iron and unavoidable impurities to a temperature of the Ac3 [° C.] to 1150° C., then cooling it in a range of 400 to 800° C. at a rate of 5 to 50° C./second.

Abstract translation: 本发明提供一种制造膨胀后的塌陷压力小而且在约100℃下通过低温老化回收的塌陷压力和通过该生产方法获得的油管制品的油井筒制品的生产方法。 这种生产方法包括在特定范围内热轧具有C，Mn，P，S，Nb，Ti，Al和N的添加量的钢坯，并且具有铁和不可避免的杂质的平衡，并将钢带卷绕在 温度不超过300℃，因为它进入管中。 或者，它包括加热具有特定范围内的C，Mn，P，S，Nb，Ti，Al和N的量的钢管，并且其余量为铁和不可避免的杂质至Ac 3 [℃]的温度。 ]至1150℃，然后以5至50℃/秒的速率在400至800℃的范围内冷却。

公开(公告)号：US20050178456A1

公开(公告)日：2005-08-18

申请号：US10515543

申请日：2003-05-23

Applicant: Eiji Tsuru ,  Hitoshi Asahi

Inventor： Eiji Tsuru ,  Hitoshi Asahi

IPC: B21C37/08 ,  C21D9/08 ,  C21D9/50 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  F16L9/00 ,  B21D31/04

CPC classification number: C22C38/02 ,  B21C37/065 ,  B21C37/08 ,  B21C37/0822 ,  B21C37/0826 ,  C21D9/08 ,  C21D9/50 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  Y10T29/18

Abstract: The present invention relates to UOE steel pipe excellent in collapse characteristics formed by the UOE production method and a method for forming this UOE steel pipe, said UOE steel pipe characterized in that a ratio between compression and tension of yield strength in the circumferential direction is at least 1.05 near the inside surface and is at least 0.9 to not more to 1.0 from the center of plate thickness to the outside surface.

Abstract translation: 本发明涉及通过UOE制造方法形成的具有优异的塌陷特性的UOE钢管和形成该UOE钢管的方法，所述UOE钢管的特征在于，圆周方向的屈服强度的压缩与张力之比为 在内表面附近至少为1.05，并且从板厚中心到外表面为至少0.9至不大于1.0。

公开(公告)号：US09188253B2

公开(公告)日：2015-11-17

申请号：US13806415

申请日：2011-07-13

Applicant: Mitsuru Sawamura ,  Hitoshi Asahi ,  Eiji Tsuru ,  Jun Agata

Inventor： Mitsuru Sawamura ,  Hitoshi Asahi ,  Eiji Tsuru ,  Jun Agata

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/48 ,  C21D8/04 ,  F16L9/02 ,  C21D8/02 ,  C21D8/10 ,  C21D9/14 ,  C22C38/00 ,  C22C38/06 ,  C22C38/12 ,  B21B23/00

CPC classification number: F16L9/02 ,  B21B23/00 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/105 ,  C21D9/14 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14

Abstract: A steel pipe with dual phase structure includes, as chemical composition, by mass %, C: 0.07% to 0.15%, Si: 0.1% to 0.5%, Mn: 0.8% to 1.9%, Nb: 0.020% to 0.10%, P: limited to 0.05% or less, S: limited to 0.01% or less, Al: limited to 0.1% or less, and a balance consisting of iron and unavoidable impurities, wherein, when [X] is amount of element X in mass %, carbon equivalent Ceq defined by Equation of Ceq=[C]+[Mn]/6 is 0.25 to 0.40 and [Nb]×[C]≧0.002 is satisfied, and includes, as metallographic structure, by area %, ferrite of 80% to 98% and martensite, residual austenite, or mixture thereof of 2% to 20% in total, wherein average grain size of ferrite is 1 μm to less than 8 μm and average grain size of martensite, residual austenite, or mixture thereof is 0.1 μm to 2 μm.

Abstract translation: 具有双相结构的钢管以质量％计含有C：0.07〜0.15％，Si：0.1〜0.5％，Mn：0.8〜1.9％，Nb：0.020〜0.10％，P ：限于0.05％以下，S：0.01％以下，Al：0.1％以下，余量由铁和不可避免的杂质构成，其中，[X]为质量％ 由Ceq = [C] + [Mn] / 6的方程式定义的碳当量Ceq为0.25〜0.40，[Nb]×[C]≥0.002，作为金相组织，以面积％计，铁素体80 ％至98％，马氏体，残余奥氏体或其混合物总计为2％至20％，其中铁素体的平均粒径为1μm至小于8μm，马氏体，残余奥氏体或其混合物的平均粒径为 0.1μm〜2μm。

公开(公告)号：US08815024B2

公开(公告)日：2014-08-26

申请号：US10588837

申请日：2005-02-15

Applicant: Hitoshi Asahi ,  Eiji Tsuru

Inventor： Hitoshi Asahi ,  Eiji Tsuru

IPC: C22C38/00 ,  C22C38/06 ,  C22C38/58

CPC classification number: C22C38/02 ,  C21D6/005 ,  C21D9/08 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/04 ,  Y10T428/13

Abstract: The present invention provides steel plate or steel pipe with small occurrence of the Bauschinger effect and methods of production of the same, particularly steel pipe used for steel pipe for oil wells or line pipe with a small drop in the compression strength in the circumferential direction due to the Bauschinger effect when expanded and methods of production of the same, that is steel plate or steel pipe with small occurrence of the Bauschinger effect characterized by having a dual-phase structure substantially comprising a ferrite structure and fine martensite which is dispersed in the ferrite structure. Further, this steel plate or steel pipe contains, by mass %, C: 0.03 to 0.30%, Si: 0.01 to 0.8%, Mn: 0.3 to 2.5%, P: 0.03% or less, S: 0.01% or less, Al: 0.001 to 0.01%, and N: 0.01% or less and a balance of iron and unavoidable impurities.

Abstract translation: 本发明提供了一种具有较少出现Bauschinger效应的钢板或钢管及其制造方法，特别是用于油井或管线管的钢管，其圆周方向的压缩强度小压降 在膨胀时的Bauschinger效应及其生产方法，即具有较少出现Bausinger效应的钢板或钢管的特征在于具有基本上包含铁素体结构的双相结构和分散在铁素体中的细小马氏体 结构体。 此外，该钢板或钢管以质量％计含有C：0.03〜0.30％，Si：0.01〜0.8％，Mn：0.3〜2.5％，P：0.03％以下，S：0.01％以下，Al ：0.001〜0.01％，N：0.01％以下，余量为铁和不可避免的杂质。

公开(公告)号：US20090320965A1

公开(公告)日：2009-12-31

申请号：US12462218

申请日：2009-07-30

Applicant: Eiji Tsuru ,  Hitoshi Asahi

Inventor： Eiji Tsuru ,  Hitoshi Asahi

IPC: C21D9/08 ,  B23K31/02

CPC classification number: C22C38/02 ,  B21C37/065 ,  B21C37/08 ,  B21C37/0822 ,  B21C37/0826 ,  C21D9/08 ,  C21D9/50 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  Y10T29/18

Abstract: The present invention relates to UOE steel pipe excellent in collapse characteristics formed by the UOE production method and a method for forming this UOE steel pipe, said UOE steel pipe characterized in that a ratio between compression and tension of yield strength in the circumferential direction is at least 1.05 near the inside surface and is at least 0.9 to not more to 1.0 from the center of plate thickness to the outside surface.

Abstract translation: 本发明涉及通过UOE制造方法形成的具有优异的塌陷特性的UOE钢管和形成该UOE钢管的方法，所述UOE钢管的特征在于，圆周方向的屈服强度的压缩与张力之比为 在内表面附近至少为1.05，并且从板厚中心到外表面为至少0.9至不大于1.0。

公开(公告)号：US20080286504A1

公开(公告)日：2008-11-20

申请号：US10588837

申请日：2005-02-15

Applicant: Hitoshi Asahi ,  Eiji Tsuru

Inventor： Hitoshi Asahi ,  Eiji Tsuru

IPC: B32B1/08 ,  C22C38/04 ,  C22C38/08 ,  C22C38/16 ,  C22C38/18 ,  C21D6/00 ,  C21D9/08 ,  C21D8/10

CPC classification number: C22C38/02 ,  C21D6/005 ,  C21D9/08 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/04 ,  Y10T428/13

Abstract: The present invention provides steel plate or steel pipe with small occurrence of the Bauschinger effect and methods of production of the same, particularly steel pipe used for steel pipe for oil wells or line pipe with a small drop in the compression strength in the circumferential direction due to the Bauschinger effect when expanded and methods of production of the same, that is steel plate or steel pipe with small occurrence of the Bauschinger effect characterized by having a dual-phase structure substantially comprising a ferrite structure and fine martensite which is dispersed in the ferrite structure. Further, this steel plate or steel pipe contains, by mass %, C: 0.03 to 0.30%, Si: 0.01 to 0.8%, Mn: 0.3 to 2.5%, P: 0.03% or less, S: 0.01% or less, Al: 0.001 to 0.01%, and N: 0.01% or less and a balance of iron and unavoidable impurities.

Abstract translation: 本发明提供了一种具有较少出现Bauschinger效应的钢板或钢管及其制造方法，特别是用于油井或管线管的钢管，其圆周方向的压缩强度小压降 在膨胀时的Bauschinger效应及其生产方法，即具有较少出现Bausinger效应的钢板或钢管的特征在于具有基本上包含铁素体结构的双相结构和分散在铁素体中的细小马氏体 结构体。 此外，该钢板或钢管以质量％计含有C：0.03〜0.30％，Si：0.01〜0.8％，Mn：0.3〜2.5％，P：0.03％以下，S：0.01％以下，Al ：0.001〜0.01％，N：0.01％以下，余量为铁和不可避免的杂质。

公开(公告)号：US06782921B1

公开(公告)日：2004-08-31

申请号：US10296854

申请日：2002-11-26

Applicant: Eiji Tsuru ,  Takuya Hara ,  Hitoshi Asahi ,  Hideki Miyazaki ,  Tatsuya Yoshida

Inventor： Eiji Tsuru ,  Takuya Hara ,  Hitoshi Asahi ,  Hideki Miyazaki ,  Tatsuya Yoshida

IPC: F16L914

CPC classification number: F16L9/17 ,  B21C37/08 ,  B21C37/0811 ,  B21C37/0815 ,  B21C37/30 ,  B23K2101/06 ,  Y10T29/18

Abstract: A high-strength steel pipe excellent in formability and burst resistance wherein, when a high-strength steel pipe exceeding 850 N/mm2 in tensile strength is produced by a UOE method, a ratio (R/r) of an average radius of curvature in a range of 120 mm in a circumferential direction including a weld of the steel pipe before pipe expansion in a pipe expansion process (R) to the radius of the steel pipe after pipe expansion (r) is 0.65 to 2.0, and preferably the ratio (R/r) is 0.90 to 2.0. Preferably, Vickers hardness of the base metal Hv, the minimum Vickers hardness at the HAZ Hz, pipe wall thickness t, and a peaking amount at the weld of the steel pipe before pipe expansion in a pipe expansion process &dgr; satisfy the following expression, (1+0.005t|&dgr;|)Hz

Abstract translation: 通过UOE法制造拉伸强度超过850N / mm 2的高强度钢管时，成形性和耐冲击性优异的高强度钢管，平均半径的比（R / r） 在管膨胀过程（R）中的管膨胀前的钢管的焊接与管膨胀后的钢管的半径（r）为0.65〜2.0的圆周方向的弯曲范围为120mm，优选为 比率（R / r）为0.90〜2.0。 优选地，在管膨胀过程δ中，在管膨胀之前，基体金属Hv的维氏硬度，HAZHz的最小维氏硬度，管壁厚度t和钢管的焊接处的峰值满足以下表达式，

公开(公告)号：US08653400B2

公开(公告)日：2014-02-18

申请号：US11884860

申请日：2006-02-22

Applicant: Eiji Tsuru ,  Takuya Hara ,  Hitoshi Asahi ,  Hiroshi Morimoto ,  Yoshio Terada ,  Tatsuya Yoshida ,  Kouichi Shinada

Inventor： Eiji Tsuru ,  Takuya Hara ,  Hitoshi Asahi ,  Hiroshi Morimoto ,  Yoshio Terada ,  Tatsuya Yoshida ,  Kouichi Shinada

IPC: B23K31/02 ,  B23K33/00 ,  B21C37/08

CPC classification number: B23K31/027 ,  B21C37/08 ,  B23K33/006 ,  B23K2101/06 ,  C21D3/06 ,  C21D9/08 ,  C21D9/50 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/58 ,  Y10T29/5185

Abstract: The present invention provides a high strength welded steel pipe superior in weld zone embrittlement crack characteristics and a method of production of the same, that is, a method of production of a welded steel pipe superior in hydrogen embrittlement cracking resistance of weld metal characterized by seam welding from the inner and outer surfaces by a tensile strength of 850 MPa or more, then expanding or reducing the size of the pipe for correction, which method of production of welded steel pipe characterized in that the hydrogen concentration of the preceding weld metal is 0.2 cc or less per 100 g at ordinary temperature.

Abstract translation: 本发明提供了一种焊接区脆性裂纹特性优异的高强度焊接钢管及其制造方法，即以接缝为特征的焊接金属的耐氢脆裂纹性优异的焊接钢管的制造方法 从内外表面拉伸强度为850MPa以上，然后扩大或缩小用于校正的管道的尺寸，该焊接钢管的制造方法的特征在于，前述焊接金属的氢浓度为0.2 在常温下每100g 100g以下。