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Title:
STEEL SHEET, MEMBER, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2023/218730
Kind Code:
A1
Abstract:
The present invention makes it possible to obtain a TS of 780 MPa or above, as well as a high YS and YR, an excellent press moldability (ductility, hole expandability, and bendability), and fracture resistance characteristics during collision (flexural fracture characteristics and axial crushing characteristics).　A base steel sheet is imparted with a prescribed component composition. With regards to the steel structure of the base steel sheet at the 1/4 position of the sheet thickness: the steel structure has ferrite, fresh martensite, retained austenite, bainite, tempered bainite, and tempered martensite in prescribed ranges; the value obtained by dividing the total area ratio of isolated island retained austenite and isolated island fresh martensite in ferrite grains by the total of the area ratio of fresh martensite and the area ratio of retained austenite is 0.65 or above; and the average crystal grain diameter of isolated island retained austenite and isolated island fresh martensite in ferrite grains is 2.0 or below. The amount of diffusible hydrogen contained in the base steel sheet is 0.50 mass ppm or below.

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Inventors:
KAWASAKI YOSHIYASU (JP)
WADA YUSUKE (JP)
MINAMI HIDEKAZU (JP)
NAKAGAITO TATSUYA (JP)
Application Number:
PCT/JP2023/006924
Publication Date:
November 16, 2023
Filing Date:
February 27, 2023
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/06; C22C38/60; C22C18/00
Domestic Patent References:
WO2020170542A12020-08-27
WO2019189841A12019-10-03
WO2019106894A12019-06-06
WO2021024748A12021-02-11
WO2011025042A12011-03-03
Foreign References:
JP2017507241A2017-03-16
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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