Title:
ELECTRIC RESISTANCE WELDED PIPE AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2024/053168
Kind Code:
A1
Abstract:
Provided is a high strength electric resistance welded pipe having excellent SSC resistance. This electric resistance welded pipe has an absolute value of residual stress in the circumferential direction of the pipe inner surface of 10 MPa or more and an absolute value of residual shear stress of the pipe inner surface of 300 MPa or less. The steel structure of a base material portion of the electric resistance welded pipe at the center in the thickness direction is configured such that the total of ferrite and bainite is at least 90% in terms of volume ratio, and the average crystal grain diameter is 9.0 μm or less. The steel structure at a position 0.1 mm outside of the pipe inner surface of the base material portion in the pipe radial direction is configured such that the total of ferrite and bainite is at least 95% in terms of volume ratio.
Inventors:
MATSUMOTO AKIHIDE (JP)
IDE SHINSUKE (JP)
IDE SHINSUKE (JP)
Application Number:
PCT/JP2023/019003
Publication Date:
March 14, 2024
Filing Date:
May 22, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/02; B21B1/22; B21C37/08; B21C37/30; C22C38/00; C22C38/06; C22C38/58
Domestic Patent References:
| WO2021200402A1 | 2021-10-07 | |||
| WO2021085036A1 | 2021-05-06 |
Foreign References:
| JP2010037612A | 2010-02-18 | |||
| CN105734444A | 2016-07-06 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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