公开(公告)号：US20210025523A1

公开(公告)日：2021-01-28

申请号：US16977835

申请日：2019-02-14

申请人： JFE STEEL CORPORATION

发明人： Takamasa KAWAI ,  Masaki YOSHIKAWA ,  Jun TAKANO ,  Takuya NAGAHAMA ,  Haruhiko SEKI

IPC分类号： F16L15/00 ,  E21B17/042

摘要： 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：US20230044251A1

公开(公告)日：2023-02-09

申请号：US17757722

申请日：2020-09-11

申请人： JFE STEEL CORPORATION

发明人： Jun TAKANO ,  Takamasa KAWAI ,  Takuya NAGAHAMA ,  Seigo GOTO ,  Masaki YOSHIKAWA ,  Tsuyoshi YONEYAMA

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

摘要： 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：US20180258709A1

公开(公告)日：2018-09-13

申请号：US15542137

申请日：2015-11-24

申请人： JFE STEEL CORPORATION

发明人： TSUYOSHI YONEYAMA ,  Hiroshi Chikatsune ,  Masaki Yoshikawa ,  Harunhiko SEKI ,  Jun TAKANO ,  Takuya Naghama ,  Masateru Ueta ,  Takamasa KAWAI

IPC分类号： E21B17/042 ,  F16L15/04

CPC分类号： E21B17/0426 ,  E21B17/042 ,  F16L15/004 ,  F16L15/04 ,  F16L15/06

摘要： A screw joint for a pipe comprising (1) a pin member, the raw pipe portion of which has an outer diameter set to 168.3 mm or less, and wherein an outer peripheral surface of a nose portion of the pin member is formed into an outwardly projecting convex curve as viewed in cross section taken along an axial direction of the pin member, wherein the convex curve is formed into a curved shape where a composite R curve is formed by sequentially connecting a plurality of outwardly convex arcs having different radii of curvature R from each other on a generating line of a cylindrical portion disposed adjacent to a male threaded portion, a radius of curvature R of the arc is increased as the arc is away from the male threaded portion, and a tangent of the arc on a connecting point agrees with a tangent of the arc which is a connection counterpart, and wherein a length of the nose portion is set from 5 mm to less than 20 mm, and (2) a box member, wherein the inner peripheral surface of the box member is formed into a tapered surface which interferes with the outer peripheral surface of the nose portion of the pin member at the time of joining with the pin member.