Title:
STEEL WELDED MEMBER
Document Type and Number:
WIPO Patent Application WO/2023/054717
Kind Code:
A1
Abstract:
Provided is a steel welded member that has a high resistance to LME of a spot welded section. In this steel welded member, a plurality of Zn-plated steel materials each having a Zn-based plating layer on the surface of a steel material have been joined via at least one spot welded section. The steel welded member is characterized in that at least one of the Zn-plated steel materials has a tensile strength of 780 MPa or greater, said steel material has a component composition including, by mass%, 0.05-0.40% C, 0.2-3.0% Si, 0.1-5.0% Mn, and 0.4-1.50% sol. Al, or similar, the remainder consisting of Fe and unavoidable impurities, and in a region that is 10-300 μm from an end section of a pressure welded section of the spot welded section, the difference that results from subtracting the depth of an internal oxidation layer formed in the steel material from the Zn penetration depth to which Zn from the Zn-based plating layer has penetrated into the steel material is within the range 0.1-10.0 μm.
Inventors:
MITSUNOBU TAKUYA (JP)
TAKEBAYASHI HIROSHI (JP)
MATSUDA KEITARO (JP)
TAKEBAYASHI HIROSHI (JP)
MATSUDA KEITARO (JP)
Application Number:
PCT/JP2022/036855
Publication Date:
April 06, 2023
Filing Date:
September 30, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; B23K11/11; C21D9/46; C22C38/58; C23C2/06
Domestic Patent References:
| WO2019116531A1 | 2019-06-20 | |||
| WO2014102901A1 | 2014-07-03 | |||
| WO2021112584A1 | 2021-06-10 | |||
| WO2022149511A1 | 2022-07-14 | |||
| WO2022071305A1 | 2022-04-07 |
Foreign References:
| JP2020524743A | 2020-08-20 | |||
| JP2020179413A | 2020-11-05 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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