Title:
STEEL PLATE
Document Type and Number:
WIPO Patent Application WO/2023/068368
Kind Code:
A1
Abstract:
This steel plate has a prescribed chemical composition and has a microstructure containing, in terms of area ratio, 5.0% or less of ferrite and over 90.0% in total of martensite and tempered martensite, the balance being one or more of bainite, pearlite, and retained austenite. In a cross-section taken along the plate thickness direction, regions in which the Mn content is 1.1×[Mnave] or greater are present such that the number density of said regins is 5.0×10−4/μm2 or greater and such that the spacing in relation to the nearest other region in which the Mn content is 1.1×[Mnave] or greater is, on average, 10.0 μm or less, where [Mnave] is the average of the Mn content in the entirety of the plate thickness direction. The steel plate has a tensile strength of 1,500 MPa or greater.
Inventors:
OHGA KOYO (JP)
TAKEDA KENGO (JP)
NAKANO KATSUYA (JP)
TAKEDA KENGO (JP)
NAKANO KATSUYA (JP)
Application Number:
PCT/JP2022/039377
Publication Date:
April 27, 2023
Filing Date:
October 21, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/60; C21D9/46
Domestic Patent References:
| WO2020203158A1 | 2020-10-08 | |||
| WO2020129402A1 | 2020-06-25 | |||
| WO2021045168A1 | 2021-03-11 |
Foreign References:
| JP2021172425A | 2021-11-01 | |||
| JP2006207019A | 2006-08-10 | |||
| JP2010138489A | 2010-06-24 | |||
| JP2011179030A | 2011-09-15 | |||
| JP2010215958A | 2010-09-30 | |||
| JP2016153524A | 2016-08-25 | |||
| JP2016050343A | 2016-04-11 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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