Title:
電縫鋼管およびその製造方法
Document Type and Number:
Japanese Patent JP7078029
Kind Code:
B2
Abstract:
To provide an electroseamed steel pipe in which fluctuation in a pipe thickness in a pipe circumferential direction around a pipe bottom due to pipe making is small, and buckling can be suppressed, and a method for manufacture of the same.SOLUTION: An electroseamed steel pipe has a seam part. A pipe thickness of the electroseamed steel pipe within a range, in which an angle θ1 in a pipe circumferential direction from a pipe bottom part with the pipe bottom part as a starting point when the seam part is turned up with a center of the electroseamed steel pipe as a central coordinate, is 0° to ±45°, falls within a range of 95.0% or more and 105.0% or less on the basis of an average pipe thickness in the pipe circumferential direction.SELECTED DRAWING: Figure 3
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Inventors:
Masashi Matsumoto
Akihide Matsumoto
Okabe Nochi
Shinsuke Ide
Akihide Matsumoto
Okabe Nochi
Shinsuke Ide
Application Number:
JP2019226342A
Publication Date:
May 31, 2022
Filing Date:
December 16, 2019
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
B21C37/08; C21D8/02; C22C38/00; C22C38/06; C22C38/14
Domestic Patent References:
| JP2018047506A | ||||
| JP63180328A | ||||
| JP2002059220A | ||||
| JP2012132088A | ||||
| JP5630026B2 | ||||
| JP8337817A |
Other References:
山下力也他,溶接鋼管製造用パーシャルステップフォーミングの開発,塑性と加工 Journal of the JSTP,vol.50 no.587 (2009-12),日本,社団法人日本塑性加工学会,2019年12月25日,1107-1109
谷本道俊他,24インチ中径電縫鋼管新成形機の設置,新日鉄技報第380号,日本,2004年,106-110
谷本道俊他,24インチ中径電縫鋼管新成形機の設置,新日鉄技報第380号,日本,2004年,106-110
Attorney, Agent or Firm:
Tetsuro Isomura
Akira Kumasaka
Tetsuya Sakai
Kazuhiro Mori
Akira Kumasaka
Tetsuya Sakai
Kazuhiro Mori