Title:
HOT-ROLLED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2024/080327
Kind Code:
A1
Abstract:
Provided is a hot-rolled steel sheet: that has a desired chemical composition; in which a metal structure thereof at a 1/4 position in the sheet thickness direction from a surface consists of, in terms of 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 and has an E value of 10.7 or greater, an I value of 1.020 or greater, 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; and in which, at the surface, the area% of a region in which the Ni concentration is 0.2% by mass or greater is 10.0% or greater, the area% of a region in which the O concentration is 3.0% by mass or greater is 3.0-50.0%, a maximum value of the sphere-equivalent diameter of an oxide is 5.00 µm or less, and the tensile strength is 980 MPa or greater.
Inventors:
YOSHITAKE MUTSUMI (JP)
SHUTO HIROSHI (JP)
SAKURADA EISAKU (JP)
ANDO JUN (JP)
SUGIYAMA TOSHIKI (JP)
SHUTO HIROSHI (JP)
SAKURADA EISAKU (JP)
ANDO JUN (JP)
SUGIYAMA TOSHIKI (JP)
Application Number:
PCT/JP2023/037013
Publication Date:
April 18, 2024
Filing Date:
October 12, 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 | |||
| WO2020184372A1 | 2020-09-17 | |||
| WO2023063010A1 | 2023-04-20 |
Foreign References:
| JPH0479722B2 | 1992-12-16 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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