Title:
HIGH-STRENGTH HOT-ROLLED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2024/058096
Kind Code:
A1
Abstract:
Provided is a high-strength hot-rolled steel sheet having a predetermined chemical composition, wherein at all of the positions of 1/10W, 3/10W, 5/10W, 7/10W, and 9/10W from the end in the width direction (W is the total width in the direction perpendicular to the rolling direction and the sheet thickness direction), the metal structure at 1/4 position of the sheet thickness contains, in area%, at least 95% of tempered martensite, 5% or less of fresh martensite, and 5% of less in total of at least one among ferrite, upper bainite, and pearlite, and the difference between the maximum and minimum tensile strengths at all of the positions in the width direction is 30 MPa or less.
Inventors:
ITO DAISUKE (JP)
ASATO TETSU (JP)
SAKAKIBARA AKIFUMI (JP)
HAYASHIDA TERUKI (JP)
ASATO TETSU (JP)
SAKAKIBARA AKIFUMI (JP)
HAYASHIDA TERUKI (JP)
Application Number:
PCT/JP2023/032979
Publication Date:
March 21, 2024
Filing Date:
September 11, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C21D9/46; C22C38/60
Domestic Patent References:
| WO2022153927A1 | 2022-07-21 | |||
| WO2021153746A1 | 2021-08-05 |
Foreign References:
| JP2016183414A | 2016-10-20 | |||
| JP2021063253A | 2021-04-22 | |||
| CN111593264A | 2020-08-28 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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