STEEL PIPE JOINT STRUCTURE AND STEEL PIPE WORKING METHOD

WIPO Patent Application WO/2023/139721

A1

The purpose of the invention is to provide a steel pipe joint structure with which a high tightening torque can be obtained without enlarging the outer diameter and without increasing the wall thickness. The steel pipe joint structure according to the present invention connects a first steel pipe having a male thread formed on at least one end and a second steel pipe having a female thread formed in at least one end, a male thread being formed on the first steel pipe and a female thread being formed in the second steel pipe. The male threaded part includes a pin front parallel threaded part that is a parallel and incomplete thread at a pin-front-side end, and a pin complete threaded part that is a tapering and complete thread in the center of the male threaded part. The female threaded part includes a box rear incomplete threaded part that is a tapering and incomplete thread at a box-rear-side end, and a box complete threaded part that is a tapering and complete thread in the center of the female threaded part. The box rear incomplete threaded part and the pin front parallel threaded part are screwed together, and in a cross section including the pipe shaft, the width of the root of the pin front parallel threaded part is greater than the width of the root of the pin complete threaded part.

SUZUKI TERUAKI (JP)
NISHI MASATSUGU (JP)
SATO NOBUHIDE (JP)
URABE KENZO (JP)
INOUE TOMONORI (JP)

PCT/JP2022/001960

July 27, 2023

January 20, 2022

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METAL ONE CORP (JP)

F16L15/04

WO2021044862A1	2021-03-11
WO2015105054A1	2015-07-16

JPH0280886A	1990-03-20
JPS6069387A	1985-04-20
JP2018500526A	2018-01-11
JPH05500842A	1993-02-18
US4384737A	1983-05-24

KISA PATENT & TRADEMARK FIRM (JP)

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