Title:
ELECTRIC RESISTANCE WELDED STEEL PIPE, METHOD FOR PRODUCING SAME, AND STRUCTURAL MEMBER FOR AUTOMOBILE
Document Type and Number:
WIPO Patent Application WO/2021/187408
Kind Code:
A1
Abstract:
Provided is an electric resistance welded steel pipe having excellent workability and torsion fatigue resistance and a method for producing same. An electric resistance welded steel pipe 1 comprises a seam region 3, which is a region from an electric resistance weld seam portion 2 formed in the lengthwise direction of the pipe to ±10 degrees in the circumferential direction of the pipe, and a base material region 6, which is a region other than the seam region 3, wherein the r value in the lengthwise direction of the pipe is 1.0 or greater, H (mm) (which is the difference (Tb(Ave) – Ts(MIN)) between the minimum value Ts(MIN) (mm) of the thickness of the seam region 3 and the average value Tb(Ave) (mm) of the thickness of the base material region 6) and the arc length W (mm) of the pipe inner surface of the seam region 3 satisfy equation (1), and the maximum value Ts(MAX) (mm) of the thickness of the seam region 3 and Tb(Ave) (mm) satisfy equation (2). (1): H/W≤0.10
(2): TS(MAX)/Tb(Ave)≤1.05
Inventors:
NAKAZAWA RYO (JP)
SHIROSAWA HIROYUKI (JP)
IDE SHINSUKE (JP)
SHIROSAWA HIROYUKI (JP)
IDE SHINSUKE (JP)
Application Number:
PCT/JP2021/010334
Publication Date:
September 23, 2021
Filing Date:
March 15, 2021
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B21C37/30; B21C37/08; B21D5/12
Domestic Patent References:
| WO2019188224A1 | 2019-10-03 | |||
| WO2016143271A1 | 2016-09-15 |
Foreign References:
| JP2006274436A | 2006-10-12 | |||
| JPH11151524A | 1999-06-08 | |||
| JP2001115238A | 2001-04-24 | |||
| JP5942572B2 | 2016-06-29 | |||
| JP5845623B2 | 2016-01-20 |
Other References:
See also references of EP 4098380A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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