Title:
HOT-ROLLED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2024/009812
Kind Code:
A1
Abstract:
This hot-rolled steel sheet has a desired chemical composition and has a metal structure which contains, in terms of area%, at least 10% of bainite, at least 10% of tempered martensite, a total of 70-96% of bainite and tempered martensite, at most 20% of fresh martensite, 4-12% of retained austenite, at most 5% of ferrite, and at most 5% of pearlite, and in which: the average grain diameter of prior austenite grains is at most 20.0 μm; the average aspect ratio of prior austenite grains is at most 3.00; and the area ratio of an aggregate of fresh martensite having a major diameter of at least 30 μm and retained austenite is at most 5%.
Inventors:
YASUTOMI TAKASHI (JP)
SAKURADA EISAKU (JP)
SAKURADA EISAKU (JP)
Application Number:
PCT/JP2023/023384
Publication Date:
January 11, 2024
Filing Date:
June 23, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D9/46; C22C38/00; C22C38/58
Domestic Patent References:
| WO2020170681A1 | 2020-08-27 | |||
| WO2021225073A1 | 2021-11-11 | |||
| WO2017017933A1 | 2017-02-02 | |||
| WO2022180954A1 | 2022-09-01 |
Foreign References:
| CN112760556A | 2021-05-07 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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