Title:
HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2022/210219
Kind Code:
A1
Abstract:
To provide a high-strength hot-rolled steel sheet that is highly effective in suppressing wrinkle generation and cracking during bending. The high-strength hot-rolled steel sheet has a component composition containing, in terms of mass%, 0.02-0.23% of C, 0.10-3.00% of Si, 0.5-3.5% of Mn, 0.100% or less of P, 0.02% or less of S, and 1.5% or less of Al, with the remainder made up of Fe and unavoidable impurities. The total area ratio of martensite and bainite is 80-100%, the maximum azimuth density of crystal grains in the region 5-10 μm from the surface in the sheet thickness direction is less than 2.5, and the maximum azimuth density of crystal grains in the region 50-100 μm from the surface in the sheet thickness direction is 2.5 or more.
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Inventors:
HASEGAWA HIROSHI (JP)
KIMURA HIDEYUKI (JP)
UMINO TAKANORI (JP)
MORIYASU NORIAKI (JP)
KIMURA HIDEYUKI (JP)
UMINO TAKANORI (JP)
MORIYASU NORIAKI (JP)
Application Number:
PCT/JP2022/013739
Publication Date:
October 06, 2022
Filing Date:
March 23, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C21D9/46; C22C38/06; C22C38/60
Domestic Patent References:
| WO2020110843A1 | 2020-06-04 | |||
| WO2019103121A1 | 2019-05-31 | |||
| WO2019031583A1 | 2019-02-14 | |||
| WO2016129213A1 | 2016-08-18 |
Foreign References:
| JP2009132988A | 2009-06-18 | |||
| JP2015160986A | 2015-09-07 | |||
| JP2009167467A | 2009-07-30 | |||
| JP2016204690A | 2016-12-08 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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