Title:
HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2023/132351
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% to 96.0% of bainite, 70.0% or less of 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, the proportion of the line length that is in contact with residual austenite in the line length of large tilt angle grain boundaries of bainite having a crystal misorientation of 15° or more is not less than 3.0% but less than 12.0%.
Inventors:
SAKURADA EISAKU (JP)
YASUTOMI TAKASHI (JP)
YASUTOMI TAKASHI (JP)
Application Number:
PCT/JP2023/000119
Publication Date:
July 13, 2023
Filing Date:
January 06, 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)
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