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：US11549620B2

公开(公告)日：2023-01-10

申请号：US16977835

申请日：2019-02-14

Applicant: JFE STEEL CORPORATION

Inventor： Takamasa Kawai ,  Masaki Yoshikawa ,  Jun Takano ,  Takuya Nagahama ,  Haruhiko Seki

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

Abstract: A screw joint in which an efficient screw length of a joint portion is achieved. This screw joint is for an oil well pipe of an integral type and includes: (i) a pin that is provided with a male screw portion which is a male taper screw, at one end of a steel pipe; and (ii) a box that is provided with a female screw portion which is a female taper screw fitted to the male screw portion, at one end of the steel pipe, in which a structure, in which the pin and the box are in metal contact with each other to seal a fluid, is provided at least at one place of a seal portion on an outer peripheral surface side of a pipe end side of the pin and a seal portion on an inner peripheral surface side of a pipe end side of the box.

公开(公告)号：US20190211632A1

公开(公告)日：2019-07-11

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: E21B17/08 ,  F16L15/04 ,  F16L15/00

CPC classification number: E21B17/08 ,  E21B17/0423 ,  F16L15/002 ,  F16L15/007 ,  F16L15/04

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：US10202809B2

公开(公告)日：2019-02-12

申请号：US14763229

申请日：2013-01-28

Applicant: JFE Steel Corporation

Inventor： Takuya Nagahama ,  Osamu Sonobe ,  Masaki Yoshikawa ,  Jun Takano ,  Takamasa Kawai

IPC: E21B17/042 ,  F16L15/00

Abstract: A threaded joint in which the outer peripheral face of the pin nose has a single tapered shape, the seal face of the box has an outwardly convex curved shape, and a seal point xp defined by equation (1) is greater than or equal to 0.2 inches, x p = ∫ x 1 x 2 ⁢ p ⁢ ⁢ x ⁢ ⁢ d ⁢ ⁢ x F ⁢ ⁢ F = ∫ x 1 x 2 ⁢ p ⁢ ⁢ d ⁢ ⁢ x ( 1 ) where p is a contact face pressure, x is a distance from an end of the pin in a pipe axis direction, and x1 and x2 are respectively a lower limit and an upper limit of a domain of x corresponding to the seal portion.

公开(公告)号：US20180080287A1

公开(公告)日：2018-03-22

申请号：US15561778

申请日：2016-03-28

Applicant: JFE Steel Corporation

Inventor： Masaki Yoshikawa ,  Kazunari Takahashi ,  Taro Kanayama ,  Jun Takano ,  Takamasa Kawai ,  Tsuyoshi Yoneyama

IPC: E21B17/08 ,  F16L15/04

Abstract: A threaded pipe joint, when acted upon by a tensile load, does not break on the female thread-side of a first thread section of a second thread series that extends from an intermediate shoulder. The threaded pipe joint reliably undergoes tensile rupture on the female thread-side of a first thread section of a first thread series, which is the original critical cross-section site. The threaded pipe joint is configured so that when the male and female threads of the intermediate shoulder are screwed together, the load flank-side thread gaps L1G and L2G of a first thread series, which is the radially inward thread series, and a second thread series, which is the radially outward thread series, on the two sides of the intermediate shoulder always satisfy the relationship L1G

公开(公告)号：US20160334033A1

公开(公告)日：2016-11-17

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

CPC classification number: F16L15/001 ,  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.

Abstract translation: 螺纹接头适用于其中应力或应变集中几乎不发生在箱体侧的螺纹角部处的管，即使当螺纹接头承受反复的拉伸压缩力或反复弯曲力时。 在径向密封型螺纹接头中，由截面积Sc之间的比率Sc / Sp定义的拉伸效率TE（％），临界横截面（CCS）的面积包括拉伸应力和应变的部分 盒体管圆周截面最高，管体截面面积Sp满足公式TE（％）≥2.25×t /ρ+ 99.9，其中箱体的内螺纹高度t为t /ρ 以及内螺纹底部承载面侧的角部的曲率半径ρ。

公开(公告)号：US09470345B2

公开(公告)日：2016-10-18

申请号：US14351976

申请日：2012-10-16

Applicant: JFE Steel Corporation

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

IPC: F16L25/00 ,  F16L15/00 ,  E21B17/042 ,  C10M171/00 ,  C10M103/04

CPC classification number: F16L15/004 ,  C10M103/04 ,  C10M171/00 ,  C10M2201/053 ,  C10N2210/01 ,  C10N2210/04 ,  C10N2210/06 ,  C10N2230/06 ,  E21B17/042

Abstract: In the threaded joint for pipes, a coating having a Vickers hardness greater than or equal to 310 is formed on a threaded portion of the box and an inner face of the box corresponding to a seal portion. The seal interference amount ratio δ/D of the seal portion in a pipe circumferential direction is greater than or equal to 0.002, where D is a seal diameter defined as an outside diameter of the pin at a seal point that is a point on the outer peripheral face of the nose of the pin at which the outer peripheral face first comes into contact with the inner peripheral face of the nose of the box and δ is an interference amount defined as an amount by which the outside diameter at the seal point is reduced by the box when the pin and the box are threadedly connected with each other.

Abstract translation: 在用于管道的螺纹接头中，维氏硬度大于或等于310的涂层形成在箱的螺纹部分和对应于密封部分的箱的内表面上。 密封部在管圆周方向上的密封干涉量比δ/ D大于或等于0.002，其中D是在作为外部的点处的密封点处的销的外径的密封直径 外周面首先与盒子的鼻部的内周面接触的销的鼻部的外周面，δ是限定为密封点处的外径减少的量的干涉量 通过盒子当销和盒子彼此螺纹连接时。

公开(公告)号：US20150368987A1

公开(公告)日：2015-12-24

申请号：US14763229

申请日：2013-01-28

Applicant: JFE STEEL CORPORATION

Inventor： Takuya Nagahama ,  Osamu Sonobe ,  Masaki Yoshikawa ,  Jun Takano ,  Takamasa Kawai

IPC: E21B17/042 ,  F16L15/00

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

Abstract: A threaded joint in which the outer peripheral face of the pin nose has a single tapered shape, the seal face of the box has an outwardly convex curved shape, and a seal point xp defined by equation (1) is greater than or equal to 0.2 inches, x p = ∫ x 1 x 2  px   x F   F = ∫ x 1 x 2  p   x ( 1 ) where p is a contact face pressure, x is a distance from an end of the pin in a pipe axis direction, and x1 and x2 are respectively a lower limit and an upper limit of a domain of x corresponding to the seal portion.

Abstract translation: 一种螺纹接头，其中鼻尖的外周面具有单个锥形形状，盒的密封面具有向外凸的弯曲形状，并且由等式（1）定义的密封点xp大于或等于0.2 英寸xp =∫×1×2×px××××××××××××××××××××××××××××××××××××××××××××××××××××××× 在管轴方向上，x1和x2分别是对应于密封部的x的下限和x的上限。

公开(公告)号：US20150061287A1

公开(公告)日：2015-03-05

申请号：US14351976

申请日：2012-10-16

Applicant: JFE Steel Corporation

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

IPC: F16L15/00 ,  E21B17/042

CPC classification number: F16L15/004 ,  C10M103/04 ,  C10M171/00 ,  C10M2201/053 ,  C10N2210/01 ,  C10N2210/04 ,  C10N2210/06 ,  C10N2230/06 ,  E21B17/042

Abstract: In the threaded joint for pipes, a coating having a Vickers hardness greater than or equal to 310 is formed on a threaded portion of the box and an inner face of the box corresponding to a seal portion. The seal interference amount ratio δ/D of the seal portion in a pipe circumferential direction is greater than or equal to 0.002, where D is a seal diameter defined as an outside diameter of the pin at a seal point that is a point on the outer peripheral face of the nose of the pin at which the outer peripheral face first comes into contact with the inner peripheral face of the nose of the box and δ is an interference amount defined as an amount by which the outside diameter at the seal point is reduced by the box when the pin and the box are threadedly connected with each other.

Abstract translation: 在用于管道的螺纹接头中，维氏硬度大于或等于310的涂层形成在箱的螺纹部分和对应于密封部分的箱的内表面上。 密封部在管圆周方向上的密封干涉量比δ/ D大于或等于0.002，其中D是在作为外部的点处的密封点处的销的外径的密封直径 外周面首先与盒子的鼻部的内周面接触的销的鼻部的外周面，δ是限定为密封点处的外径减少的量的干涉量 通过盒子当销和盒子彼此螺纹连接时。

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.