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Title:
HOT-PRESSED MEMBER AND METHOD FOR MANUFACTURING SAME, AND COLD-ROLLED STEEL SHEET FOR HOT PRESSING AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2019/003539
Kind Code:
A1
Abstract:
In the hot-pressed member according to the present invention, after the component composition thereof is properly adjusted, the microstructure thereof is configured so that the average particle size of prior austenite crystal particles is at most 8 µm, the volume fraction of martensite is at least 90%, at least 10 cementite particles having a particle size of at least 0.05 µm are present on average per 200 µm2 of the cross section parallel to the thickness direction of the member, and at least 10 Ti-based deposits having a particle size of less than 0.10 µm are present on average per 100 µm2 of the cross section parallel to the thickness direction of the member in the range from the surface of the member to a depth of 100 µm in the sheet thickness direction. Thereby, the hot-pressed member not only has an extremely high tensile strength TS of at least 1780 MPa after hot pressing, but excellent delayed fracture resistance and high cross tensile strength after resistance spot welding.

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Inventors:
TAKASHIMA KATSUTOSHI (JP)
KOBAYASHI TAKASHI (JP)
FUNAKAWA YOSHIMASA (JP)
NAKAJIMA SEIJI (JP)
Application Number:
PCT/JP2018/013717
Publication Date:
January 03, 2019
Filing Date:
March 30, 2018
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D1/18; C21D9/00; C21D9/46; C22C38/38; C22C38/60
Domestic Patent References:
WO2015147216A12015-10-01
Foreign References:
JP2007314817A2007-12-06
JP2010174278A2010-08-12
JP2006152427A2006-06-15
JP2017043825A2017-03-02
JP2013185245A2013-09-19
US20090238715A12009-09-24
JP2015113500A2015-06-22
JP2014122398A2014-07-03
Other References:
See also references of EP 3647448A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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