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Title:
STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2023/068369
Kind Code:
A1
Abstract:
This steel plate has a prescribed chemical composition, the microstructure thereof comprising, by area ratio, 5.0% or less ferrite and a total of greater than 90.0% martensite and tempered martensite, with the remainder being one or more of bainite, perlite, and residual austenite, and when a boundary for which the orientation difference between adjacent martensite and tempered martensite is 15 degrees or greater is defined as the prior-austenite grain boundary, the bonding strength energy EGB, as determined by the concentration of each alloy element on the prior-austenite grain boundary, is 0.50 or greater, and the tensile strength is 1500 MPa or greater.

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Inventors:
OHGA KOYO (JP)
TAKEDA KENGO (JP)
NAKANO KATSUYA (JP)
Application Number:
PCT/JP2022/039380
Publication Date:
April 27, 2023
Filing Date:
October 21, 2022
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/60; C21D9/46
Domestic Patent References:
WO2020203158A12020-10-08
WO2020129402A12020-06-25
WO2021045168A12021-03-11
Foreign References:
JP2021172424A2021-11-01
JP2006207019A2006-08-10
JP2010138489A2010-06-24
JP2011179030A2011-09-15
JP2010215958A2010-09-30
JP2016153524A2016-08-25
JP2016050343A2016-04-11
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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