Title:
HOT-ROLLED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2021/117711
Kind Code:
A1
Abstract:
A hot-rolled steel sheet that has a prescribed chemical composition. The metal structure at 1/4 of the sheet thickness from the surface of the sheet in the sheet thickness direction has a bainite principal phase and a martensite or mixed martensite/austenite second phase and has a pole density of no more than 3.0 for the (110)<112> orientation, the average grain size of the second phase being no more than 1.5 μm, and the average grain size of grains of the second phase that have a grain size within the top 10% being no more than 2.5 μm. The metal structure between the surface of the sheet and 1/16 of the sheet thickness from the surface of the sheet in the sheet thickness direction has a pole density of no more than 3.0 for the (110)<1-11> orientation.
Inventors:
ITO DAISUKE (JP)
YABU SHOHEI (JP)
TOYODA TAKESHI (JP)
YABU SHOHEI (JP)
TOYODA TAKESHI (JP)
Application Number:
PCT/JP2020/045641
Publication Date:
June 17, 2021
Filing Date:
December 08, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/60; C21D9/46
Domestic Patent References:
| WO2017017933A1 | 2017-02-02 | |||
| WO2015129199A1 | 2015-09-03 | |||
| WO2018150955A1 | 2018-08-23 | |||
| WO2014171063A1 | 2014-10-23 | |||
| WO2017017933A1 | 2017-02-02 | |||
| WO2015129199A1 | 2015-09-03 |
Foreign References:
| JP2019222161A | 2019-12-09 | |||
| JP2014205888A | 2014-10-30 | |||
| JP2007070660A | 2007-03-22 |
Other References:
See also references of EP 4074854A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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