Title:
FRAME MEMBER
Document Type and Number:
WIPO Patent Application WO/2022/224898
Kind Code:
A1
Abstract:
This frame member is obtained by joining a first steel sheet member and a second steel sheet member by spot welding at a spot-welded part. The frame member has a cross-sectional region wherein a cross section perpendicular to the lengthwise direction of the frame member is a closed cross section. The first steel sheet member has a tensile strength of no less than 1900 MPa, and the spot-welded part has a molten metal portion formed by the spot welding, and a heat-affected portion adjacent to the outside of the molten metal portion. The average Vickers hardness HvAve at a measurement site corresponding to a first region on a hypothetical line and the minimum Vickers hardness HvMin at a measurement site corresponding to a third region on the hypothetical line satisfy the inequality HvAve-HvMin≤100.
Inventors:
KATO RYOMA (JP)
AITOH TAKAHIRO (JP)
FUJINAKA SHINGO (JP)
TODA YURI (JP)
AITOH TAKAHIRO (JP)
FUJINAKA SHINGO (JP)
TODA YURI (JP)
Application Number:
PCT/JP2022/017788
Publication Date:
October 27, 2022
Filing Date:
April 14, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B23K11/00; B23K11/11; C22C38/00; C22C38/04
Domestic Patent References:
| WO2018038045A1 | 2018-03-01 | |||
| WO2019116531A1 | 2019-06-20 | |||
| WO2020090916A1 | 2020-05-07 |
Foreign References:
| JP2015000422A | 2015-01-05 | |||
| US20190084074A1 | 2019-03-21 | |||
| CN111545887A | 2020-08-18 | |||
| JP2016055337A | 2016-04-21 | |||
| JP2008229720A | 2008-10-02 | |||
| JP2021072691A | 2021-05-06 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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