Title:
HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2023/132342
Kind Code:
A1
Abstract:
A hot-rolled steel sheet according to the present invention has a specific chemical composition, while having a metal structure that contains, in area%, 25.0% or more of bainite, a total of 70.0% or less of fresh martensite and tempered martensite, 4.0% to 12.0% of residual austenite, 5.0% or less of ferrite and 3.0% or less of pearlite, with the average prior austenite grain size being 25.0 µm or less. With respect to the metal structure, if θ is the angle between the rolling direction and the respective major axis directions of the crystal grains of residual austenite, fresh martensite and tempered martensite, the proportion of the crystal grains having θ of 0° to 15°, the proportion of the crystal grains having θ of more than 15° but not more than 30°, the proportion of the crystal grains having θ of more than 30° but not more than 45°, the proportion of the crystal grains having θ of more than 45° but not more than 60°, the proportion of the crystal grains having θ of more than 60° but not more than 75° and the proportion of the crystal grains having θ of more than 75° but not more than 90° are 40% or less in percentage.
Inventors:
YASUTOMI TAKASHI (JP)
SAKURADA EISAKU (JP)
ABUKAWA GENKI (JP)
SAKURADA EISAKU (JP)
ABUKAWA GENKI (JP)
Application Number:
PCT/JP2023/000071
Publication Date:
July 13, 2023
Filing Date:
January 05, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C21D9/46; C22C38/58
Domestic Patent References:
| WO2021187321A1 | 2021-09-23 | |||
| WO2020203943A1 | 2020-10-08 | |||
| WO2020170681A1 | 2020-08-27 | |||
| WO2018151273A1 | 2018-08-23 |
Foreign References:
| JP2014510838A | 2014-05-01 | |||
| JP2009263715A | 2009-11-12 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
Download PDF: