Title:
STEEL PIPE WELDING JOINT
Document Type and Number:
WIPO Patent Application WO/2023/074658
Kind Code:
A1
Abstract:
This steel pipe welding joint 10 includes base material parts 1a, 1b and a circumferential weld part 2, the circumferential weld part 2 being constituted from a weld metal part 2a and weld heat-affected parts 2b, 2c, the base material parts 1a, 1b having a prescribed chemical composition and having a Pcm of 0.25-0.30, the weld metal part 2a having a prescribed chemical composition and having a B content of 0.0010% or less, the tensile strength of the circumferential weld part 2 in a joint tensile test and the tensile strength of the base material parts 1a, 1b being 980 MPa or more, the average hardness of the base material parts 1a, 1b being 300HV10 or more, the average softening width of the weld heat-affected parts 2b, 2c being 4.0 mm or less, and the average softening margin of the weld heat-affected parts 2b, 2c being 80HV10 or less.
Inventors:
DOI AKIRA (JP)
MIKI TAKESHI (JP)
NAGAYAMA HIROYUKI (JP)
KURODA NAOKI (JP)
MIKI TAKESHI (JP)
NAGAYAMA HIROYUKI (JP)
KURODA NAOKI (JP)
Application Number:
PCT/JP2022/039628
Publication Date:
May 04, 2023
Filing Date:
October 25, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D8/10; C22C38/00; C22C38/54; C22C38/58
Domestic Patent References:
| WO2010061882A1 | 2010-06-03 | |||
| WO2018025778A1 | 2018-02-08 | |||
| WO2010061882A1 | 2010-06-03 | |||
| WO2018025778A1 | 2018-02-08 |
Foreign References:
| JP2010275594A | 2010-12-09 | |||
| JP2001240913A | 2001-09-04 | |||
| JP2012193404A | 2012-10-11 |
Attorney, Agent or Firm:
BRIGHTAS IP ATTORNEYS (JP)
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