Title:
AUTOMOTIVE MEMBER AND RESISTANCE-SPOT-WELDING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/249650
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide an automotive member and a resistance-spot-welding method for the automotive member. The automotive member according to the present invention has a resistance-spot-welded portion in which a plurality of steel sheets including at least one high-strength steel sheet are subjected to resistance spot welding. The high-strength steel sheet has a specific component composition. The microstructure in the vicinity of a nugget end part of the resistance-spot-welded portion is a composite structure containing 1-30% by volume of ferrite, 1-50% by volume of martensite, and at least 20% by volume of annealed martensite. The average number density of Nb deposits having a particle size of less than 0.09 μm and Ti deposits having a particle size of less than 0.09 μm is at least 10 per 100 μm2 of a cross-section of the sheet.
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Inventors:
TAKASHIMA KATSUTOSHI (JP)
ENDO REIKO (JP)
YANG LINGLING (JP)
MATSUDA HIROSHI (JP)
ENDO REIKO (JP)
YANG LINGLING (JP)
MATSUDA HIROSHI (JP)
Application Number:
PCT/JP2022/011157
Publication Date:
December 01, 2022
Filing Date:
March 14, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B23K11/00; B23K11/11; B23K11/16; B23K11/24; C21D9/46; C22C38/00; C22C38/14; C22C38/60
Foreign References:
| JP2014180698A | 2014-09-29 | |||
| JP5043236B2 | 2012-10-10 | |||
| JP2020040122A | 2020-03-19 | |||
| JP6558443B2 | 2019-08-14 | |||
| JP6194765B2 | 2017-09-13 | |||
| JPH0258443B2 | 1990-12-07 |
Other References:
"X-ray Diffraction Handbook", vol. 26, 2000, RIGAKU CORPORATION, pages: 62 - 64
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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