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Title:
STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2021/125283
Kind Code:
A1
Abstract:
This steel sheet has a specific chemical composition, has a tensile strength of not less than 1300 MPa, and has a ratio (R/t) of critical bend radius to sheet thickness of less than 3.5, wherein AlN is present at a position A at a density of 3000-6000 molecules/mm2 , the metallographic structure at a position B contains martensite at a volume fraction of not less than 90%, and the hardness at the position A is not less than 1.20 times higher than that at the position B, where the position A is at a depth of 30 µm from the surface in the sheet thickness direction, and the position B is at a depth of 1/4 of the sheet thickness from the surface in the sheet thickness direction.

Inventors:
SUZUKI YUYA (JP)
TAKEDA KENGO (JP)
Application Number:
PCT/JP2020/047217
Publication Date:
June 24, 2021
Filing Date:
December 17, 2020
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; B21B1/22; C21D9/46; C22C38/60
Domestic Patent References:
WO2019116531A12019-06-20
WO2019003541A12019-01-03
WO2018020660A12018-02-01
WO2018011978A12018-01-18
Foreign References:
JP2004162163A2004-06-10
JP2007262553A2007-10-11
JP2019229401A2019-12-19
Other References:
YASUHIRO SEKIMOTOMORIMICHI TANAKARYOZO SAWADAMASAYOSHI KOGA, TETSU-TO-HAGANE, vol. 61, no. 10, 1975, pages 2337 - 2349
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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