Title:
GALVANIZED STEEL SHEET, MEMBER, AND PRODUCTION METHODS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/191021
Kind Code:
A1
Abstract:
The present invention provides technology relating to a galvanized steel sheet which has a high yield ratio, excellent bendability, and excellent hydrogen embrittlement resistance, and in which TS is not less than 980 MPa but less than 1470 MPa. Provided is a galvanized steel sheet comprising: a steel structure which has a carbide that contains, by area ratio, less than 50% ferrite, not less than 50% of martensite and bainite in combination, not more than 10% residual austenite, and not less than 75% martensite, and that has an average particle size of is 50-200 nm, and in which the ratio TM1/TM2 of the area ratio TM1 of tempered martensite in the entire structure in a region from the surface to 1/8 of the sheet thickness and the area ratio TM2 of tempered martensite in the entire structure in a region from 1/8 to 3/8 of the sheet thickness is not less than 0.70; and a galvanized layer which is on the surface, wherein TS is not less than 980 MPa but less than 1470 MPa, the yield ratio is not less than 0.60, and diffusible hydrogen content is not more than 0.45 mass ppm.
Inventors:
TERASHIMA SHOTARO (JP)
NAKAGAITO TATSUYA (JP)
KAWASAKI YOSHIYASU (JP)
ASAKAWA TAIYO (JP)
NAKAGAITO TATSUYA (JP)
KAWASAKI YOSHIYASU (JP)
ASAKAWA TAIYO (JP)
Application Number:
PCT/JP2023/013450
Publication Date:
October 05, 2023
Filing Date:
March 31, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D9/46; C22C18/00; C22C38/00; C22C38/06; C22C38/60; C23C2/06
Domestic Patent References:
| WO2022014131A1 | 2022-01-20 | |||
| WO2021140663A1 | 2021-07-15 | |||
| WO2017090236A1 | 2017-06-01 |
Foreign References:
| JP2020523473A | 2020-08-06 | |||
| JP2018165398A | 2018-10-25 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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