Title:
HIGH STRENGTH GALVANIZED STEEL SHEET AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/146828
Kind Code:
A1
Abstract:
Provided are: a high strength galvanized steel sheet with excellent delayed fracture resistance characteristics resulting from reduction of the amount of diffusible hydrogen in the steel; and a production method therefor. The high strength galvanized steel sheet is provided with: a steel sheet having a specified component composition and a steel structure in which, in area ratio, the total amount of martensite and tempered martensite is at least 30%; and a galvanizing layer formed on the surface of the steel sheet. The amount of diffusible hydrogen obtained from an analysis method is 0.50 wt. ppm or less and the half width of the released hydrogen peak is 70°C or less.
Inventors:
HIRASHIMA TAKUYA (JP)
NAKAGAITO TATSUYA (JP)
KOBA MASAKI (JP)
EHASHI TATSUYA (JP)
IMAMURA MAKOTO (JP)
NAKAGAITO TATSUYA (JP)
KOBA MASAKI (JP)
EHASHI TATSUYA (JP)
IMAMURA MAKOTO (JP)
Application Number:
PCT/JP2017/015714
Publication Date:
August 16, 2018
Filing Date:
April 19, 2017
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/06; C22C38/60
Domestic Patent References:
| WO2013047836A1 | 2013-04-04 | |||
| WO2015029404A1 | 2015-03-05 | |||
| WO2016031165A1 | 2016-03-03 |
Foreign References:
| JP2011111675A | 2011-06-09 | |||
| JP2010111891A | 2010-05-20 | |||
| KR20100001330A | 2010-01-06 | |||
| JP2017048412A | 2017-03-09 | |||
| JP2013108154A | 2013-06-06 | |||
| JP2007321236A | 2007-12-13 |
Other References:
See also references of EP 3550050A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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