公开(公告)号：US10443765B2

公开(公告)日：2019-10-15

申请号：US14768661

申请日：2013-12-18

Applicant: JFE STEEL CORPORATION

Inventor： Takuya Nagahama ,  Hiroshi Chikatsune ,  Kazunari Takahashi ,  Masaki Yoshikawa ,  Jun Takano ,  Masateru Ueta ,  Takamasa Kawai

IPC: F16L15/06 ,  F16L15/00 ,  E21B17/042

Abstract: A threaded joint for pipes including a pin and a box, characterized in that the relationship 0.05 degrees≤θsb−θsp≤2.0 degrees is satisfied, where θsb is an angle of an insertion surface of the female thread on the box side relative to a plane perpendicular to an axis of pipe, and θsp is an angle of an insertion surface of the male thread, which faces the insertion surface of the female thread, on the pin side relative to the plane perpendicular to the axis of pipe.

公开(公告)号：US09982815B2

公开(公告)日：2018-05-29

申请号：US14908062

申请日：2014-07-29

Applicant: JFE Steel Corporation

Inventor： Takamasa Kawai ,  Kazunari Takahashi ,  Hiroshi Chikatsune ,  Masaki Yoshikawa ,  Jun Takano ,  Takuya Nagahama ,  Masateru Ueta ,  Hideo Sato ,  Haruhiko Seki ,  Tsuyoshi Yoneyama

IPC: F16L15/06 ,  E21B17/08 ,  E21B17/042

CPC classification number: F16L15/06 ,  E21B17/042 ,  E21B17/08

Abstract: A premium threaded joint has a pin-side shoulder angle θ1, a box-side shoulder angle θ2, a seal interference quantity δ and a seal point distance xp satisfying θ2−θ1=α×δ/xp, α=7 to 14, and a pin distal end thickness tp1 defined by a difference Re−Ri between a radius Re of a pin most distal end portion and an inner radius Ri of a pin distal end portion is 0.25 times or more as large as a pin raw pipe thickness tp0.

公开(公告)号：US20150198270A1

公开(公告)日：2015-07-16

申请号：US14412286

申请日：2013-07-01

Applicant: JFE STEEL CORPORATION

Inventor： Takuya Nagahama ,  Kazunari Takahashi ,  Hiroshi Chikatsune ,  Masaki Yoshikawa ,  Jun Takano ,  Takamasa Kawai ,  Masateru Ueta

IPC: F16L15/00

CPC classification number: F16L15/00 ,  E21B17/042 ,  E21B17/08 ,  F16L15/004 ,  F16L15/06 ,  F16L2201/40

Abstract: A threaded joint for pipes is provided in which a box-side lip length L, which is the axial distance between a pin-nose-end corresponding point P of the box component 1 and a load surface 18b of a lip-side internal thread ridge 50 closest to the pin-nose-end corresponding point P, is 300 or more times as long as an insertion surface interval δ, which is the axial interval between an insertion surface 19b of an internal thread ridge at a position two or more ridges backwards from the lip-side internal thread ridge 50 and an insertion surface 19a of an external thread ridge facing the insertion surface 19b when tightened, that is, L≧300×δ.

Abstract translation: 提供了一种用于管道的螺纹接头，其中盒侧唇长度L是箱部件1的销鼻端对应点P与唇侧内螺纹脊的载荷面18b之间的轴向距离 最接近针鼻端部对应点P的距离为距离位于两个或更多个脊部的内螺纹脊的插入表面19b之间的轴向间隔的插入表面间隔δ的300倍或更多倍的300倍或更多倍 从唇缘内螺纹脊50和紧固插入面19b的外螺纹的插入面19a，即L≥300×δ。

公开(公告)号：US11905765B2

公开(公告)日：2024-02-20

申请号：US17757722

申请日：2020-09-11

Applicant: JFE STEEL CORPORATION

Inventor： Jun Takano ,  Takamasa Kawai ,  Takuya Nagahama ,  Seigo Goto ,  Masaki Yoshikawa ,  Tsuyoshi Yoneyama

IPC: F16L15/06 ,  E21B17/042 ,  F16L15/00

CPC classification number: E21B17/042 ,  F16L15/001 ,  F16L15/06

Abstract: To prevent fracture of a box under a tensile load without increasing the outer diameter of the box. The presently disclosed threaded joint for pipes includes a pin provided with a male thread portion at one end of a first pipe, and a box provided with a female thread portion at one end of a second pipe, where each of a plurality of thread grooves of the female thread portion has a corner portion on a load flank side and a corner portion on a stabbing flank side on a thread bottom side, a corner portion on a load flank side of a first thread groove includes a first arc portion that has a first curvature radius, and a second arc portion that has a second curvature radius, and a ratio of the second curvature radius to the first curvature radius is 3 or more.

公开(公告)号：US11053749B2

公开(公告)日：2021-07-06

申请号：US16328006

申请日：2017-09-13

Applicant: JFE Steel Corporation

Inventor： Takamasa Kawai ,  Taro Kanayama ,  Masaki Yoshikawa ,  Jun Takano ,  Takuya Nagahama

IPC: F16L15/00 ,  E21B17/08 ,  F16L15/04 ,  E21B17/042

Abstract: A threaded joint for oil well steel pipe is provided. The threaded joint includes a pin provided with a male thread, and a box provided with a female thread threadedly engaged with the male thread, and at an outer periphery side sealing portion, a cross-sectional area S1 of the pin at a seal point, and a cross-sectional area S0 of a pipe body portion, which is an unprocessed pin portion, satisfy an expression (S1/S0)×100≥15(%), at an inner periphery side sealing portion, a cross-sectional area S2 of the box at a seal point, and a cross-sectional area S0′ of a pipe body portion, which is an unprocessed box portion satisfy an expression (S2/S0′)×100≥20(%), and a surface area S3 of a contact portion of an intermediate shoulder between thread rows and the cross-sectional area S0 satisfy the expression (S3/S0)×100≥10(%).

公开(公告)号：US10295091B2

公开(公告)日：2019-05-21

申请号：US15111544

申请日：2014-12-18

Applicant: JFE Steel Corporation

Inventor： Masaki Yoshikawa ,  Hiroshi Chikatsune ,  Kazunari Takahashi ,  Takuya Nagahama ,  Jun Takano ,  Masateru Ueta ,  Takamasa Kawai

IPC: F16L25/00 ,  F16L15/00 ,  E21B17/042 ,  F16L15/06

Abstract: A threaded joint is adapted for tubes where the stress or the strain concentration hardly occur at a threaded corner portion of box side even when the threaded joint receives repeated tensile-compressive forces or repeated bending forces. In a radial seal type threaded joint, tensile efficiency TE (%) defined by a ratio Sc/Sp between a cross-sectional area Sc, an area of Critical Cross Section (CCS) including a portion where a tensile stress and a strain become the highest in a tube circumferential cross section of a box and a cross-sectional area Sp of a tube body satisfies formula TE (%)≥2.25×t/ρ+99.9 having a ratio t/ρ between an internal thread height t of the box and a radius of curvature ρ of a corner portion of internally-threaded bottom load surface side.

公开(公告)号：US20160319966A1

公开(公告)日：2016-11-03

申请号：US15108856

申请日：2014-10-30

Applicant: JFE STEEL CORPORATION

Inventor： Takamasa Kawai ,  Kazunari Takahashi ,  Hiroshi Chikatsune ,  Masaki Yoshikawa ,  Jun Takano ,  Takuya Nagahama ,  Masateru Ueta ,  Tsuyoshi Yoneyama ,  Hideo Sato ,  Haruhiko Seki

IPC: F16L15/04 ,  F16L15/06 ,  E21B17/042 ,  F16L15/00

CPC classification number: F16L15/04 ,  E21B17/042 ,  F16L15/004 ,  F16L15/06

Abstract: A threaded joint for heavy-walled oil country tubular goods can both ensure sealability and prevent galling in a state where a high external pressure is also applied to the threaded joint in addition to a high compressive force. A surface of a pin side forming a seal portion and a surface of a box side forming a seal portion are formed into a convex curved surface and a tapered surface, respectively. A seal thickness ts of the pin is 15 mm or less, a shape parameter ts/D (D: outer diameter of a pin raw pipe portion) is 0.045 or more, and a complete thread length ratio L/t (L: complete thread length of the pin, t: wall thickness of the pin raw pipe portion) is 4.0 or less.

Abstract translation: 用于重型油井筒的螺纹接头除了具有高的压缩力之外，还可以在螺纹接头上施加高的外部压力的状态下确保密封性并防止磨损。 形成密封部的销侧的表面和形成密封部的盒侧的表面分别形成为凸曲面和锥面。 销的密封厚度ts为15mm以下，形状参数ts / D（D：销原料管部的外径）为0.045以上，完全螺纹长度比L / t（L：完全螺纹 销的长度，t：销原料管部的壁厚）为4.0以下。

公开(公告)号：US20160178095A1

公开(公告)日：2016-06-23

申请号：US14908062

申请日：2014-07-29

Applicant: JFE STEEL CORPORATION

Inventor： Takamasa Kawai ,  Kazunari Takahashi ,  Hiroshi Chikatsune ,  Masaki Yoshikawa ,  Jun Takano ,  Takuya Nagahama ,  Masateru Ueta ,  Hideo Sato ,  Haruhiko Seki ,  Tsuyoshi Yoneyama

IPC: F16L15/06 ,  E21B17/042

CPC classification number: F16L15/06 ,  E21B17/042 ,  E21B17/08

Abstract: A premium threaded joint has a pin-side shoulder angle θ1, a box-side shoulder angle θ2, a seal interference quantity δ and a seal point distance xp satisfying θ2−θ1=α×δ/xp, α=7 to 14, and a pin distal end thickness tp1 defined by a difference Re−Ri between a radius Re of a pin most distal end portion and an inner radius Ri of a pin distal end portion is 0.25 times or more as large as a pin raw pipe thickness tp0.

Abstract translation: 优质螺纹接头具有销侧肩角度和角度; 1，箱侧肩角度和角度; 2，密封干涉量δ和密封点距离xp满足＆thetas; 2 =α×δ/ xp α= 7〜14，由最远端部销的半径R r与销末端部的内径Ri之间的差Re-Ri所限定的销末端厚度tp1为0.25倍以上 作为针管原料管厚度tp0。

公开(公告)号：US20160123091A1

公开(公告)日：2016-05-05

申请号：US14896754

申请日：2014-06-09

Applicant: JFE STEEL CORPORATION

Inventor： Takamasa Kawai ,  Kazunari Takahashi ,  Hiroshi Chikatsune ,  Masaki Yoshikawa ,  Jun Takano ,  Takuya Nagahama ,  Masateru Ueta

IPC: E21B17/042 ,  F16L15/06

CPC classification number: E21B17/042 ,  F16B33/02 ,  F16L15/004 ,  F16L15/06

Abstract: A threaded joint for an oil country tubular goods includes pins each of which occupies a pipe end portion of a steel pipe for an oil country tubular goods, and includes an externally-threaded portion, a nose extending toward a pipe end side from the externally-threaded portion, and a shoulder forming a distal end of the nose; and a box including internally-threaded portions each forming a threaded portion by being threadedly joined with the externally-threaded portion, and shoulders brought into contact with the shoulders of the pins, wherein the pins and the box being joined to each other by the threaded joining so that portions between the threaded portions and the shoulders are brought into metal-to-metal contact with each other to thereby form seal portions at the contact portions, and the shoulders of the pins and the shoulders of the box forming shoulder faces are brought into contact with each other at the time of make-up of the threaded joint, and a ratio of a chamfer length of pin thread to a thread pitch is 1.0 or more to 3.0 or less.

Abstract translation: 一种用于油井管状物品的螺纹接头，包括销钉，每个销钉占据用于油罐管件的钢管的管端部分，并且包括外螺纹部分， 螺纹部分和形成鼻部远端的肩部; 以及包括内螺纹部分的盒，每个都通过与外螺纹部分螺纹连接而形成螺纹部分，并且肩部与销的肩部接触，其中销和盒通过螺纹连接 使得螺纹部和肩部之间的部分彼此金属 - 金属接触，从而在接触部分处形成密封部分，并且形成肩部的销和肩部的肩部被带到 在螺纹接头构成时彼此接触，并且销螺纹的倒角长度与螺距的比率为1.0以上至3.0以下。

公开(公告)号：US10125554B2

公开(公告)日：2018-11-13

申请号：US14897802

申请日：2014-06-09

Applicant: JFE STEEL CORPORATION

Inventor： Takamasa Kawai ,  Kazunari Takahashi ,  Hiroshi Chikatsune ,  Masaki Yoshikawa ,  Jun Takano ,  Takuya Nagahama ,  Masateru Ueta ,  Hideo Sato ,  Haruhiko Seki ,  Tsuyoshi Yoneyama

IPC: F16L15/06 ,  E21B17/042 ,  F16L15/00

Abstract: In a joint for oil country tubular goods, a pitch change is made such that an internally-thread pitch has the same value as an externally-thread pitch from a thread end portion on a box end side to a pitch change position taken on a box center side with respect to a position away from the thread end portion by ½ of an entire length of the threaded portion, and the internally-thread pitch is changed to a value less than the externally-thread pitch at the pitch change position so that a thread gap is gradually decreased from the pitch change position to a position of the thread end portion on the box center side, and the thread gap is eventually set to a value which is 0.2 to 0.8 times as large as the thread gap before the pitch change is made.