Title:
HOT-ROLLED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2024/053701
Kind Code:
A1
Abstract:
This hot-rolled steel sheet has a specific chemical composition; the metal structure of this hot-rolled steel sheet at a position where the depth from the surface is 1/4 in the sheet thickness direction comprises, in area%, less than 3.0% of residual austenite, not less than 15.0% but less than 60.0% of ferrite and less than 5.0% of pearlite, while having an E value of 10.7 or more, an I value of 1.020 or more, a CS value of -8.0 × 105 to 8.0 × 105, and a standard deviation of the Mn concentration of 0.60% by mass or less; the average solid solution Cr concentration in the outermost layer region is 0.10% by mass or more; and the average number density of Cr oxides having a sphere equivalent radius of 0.1 µm or more in the surface is 1.0 × 104 per cm2 or less.
Inventors:
SHUTO HIROSHI (JP)
SAKURADA EISAKU (JP)
ANDO JUN (JP)
SUGIYAMA TOSHIKI (JP)
TSUTSUI KAZUMASA (JP)
SAKURADA EISAKU (JP)
ANDO JUN (JP)
SUGIYAMA TOSHIKI (JP)
TSUTSUI KAZUMASA (JP)
Application Number:
PCT/JP2023/032635
Publication Date:
March 14, 2024
Filing Date:
September 07, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C21D9/46; C22C38/58
Domestic Patent References:
| WO2022044493A1 | 2022-03-03 | |||
| WO2023063010A1 | 2023-04-20 |
Foreign References:
| JPH0479722B2 | 1992-12-16 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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