SEAMLESS TUBE AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2021/171826

A1

Provided are a seamless tube having excellent pressure-resistance performance, and a method for manufacturing the same.　This seamless tube has therein a thin-walled part that is thin in the tube circumferential direction and is formed in the tube axial direction. In the seamless tube, a line segment formed by connecting one end and the other end of the thin-walled part along the tube surface with the shortest distance in the forming direction of the thin-walled part is inclined at an angle α of 5.0° or greater with respect to the tube axial direction. It is preferable that the one end and the other end of the thin-walled part be set from an intra-tube region selected by the shorter length among a length of 1.0 m in the tube axial direction and a length of 90% of the tube axial direction length of one rotation by the thin-walled part in the tube circumferential direction.

SASAKI SHUNSUKE (JP)
YUGA MASAO (JP)
KATSUMURA TATSURO (JP)
KIJIMA HIDEO (JP)

PCT/JP2021/001455

September 02, 2021

January 18, 2021

Click for automatic bibliography generation  

JFE STEEL CORP (JP)

B21B19/02; C21D7/02; F16L15/04

WO2015182128A1	2015-12-03
WO2016113790A1	2016-07-21

JPS56168903A	1981-12-25
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JPH07265910A	1995-10-17
JPS6431504A	1989-02-01
JPH1157842A	1999-03-02
JP2012167329A	2012-09-06
JP6596954B2	2019-10-30
JP5831195B2	2015-12-09

"Steel Handbook, 3rd edition. - The Iron and Steel Institute of Japan", vol. III, 20 November 1980, MARUZEN CO., LTD, JP, article THE IRON AND STEEL INSTITUTE OF JAPAN: "Passages; 11.4.2 Mannesmann drilling equipment and operations; 14.4 Correction", pages: 929-933,1198 - 1203, XP009530833

KUMASAKA Akira et al. (JP)

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