Title:
STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2021/140901
Kind Code:
A1
Abstract:
A steel sheet having a predetermined component composition, wherein a microstructure existing at a location 1/4 of the sheet thickness from the surface in the sheet thickness direction includes, in vol%, 80% or more of ferrite, 2% or less of martensite, and 2% or less of retained austenite, the proportion of non-recrystallized ferrite in said ferrite is 5% or less, and, after the steel sheet has undergone a 10%-stretching, the quantity density of voids having a maximum diameter not less than 1.0 µm is 1.0×109 voids/m2 in the microstructure existing at a location 1/4 of the sheet thickness from the surface in the sheet thickness direction.
Inventors:
KAWATA HIROYUKI (JP)
TAKEDA KENGO (JP)
NAKANO KATSUYA (JP)
TAKEDA KENGO (JP)
NAKANO KATSUYA (JP)
Application Number:
PCT/JP2020/047738
Publication Date:
July 15, 2021
Filing Date:
December 21, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D9/46; C22C38/00; C22C38/60; C23C2/02; C23C2/06; C23C2/28
Domestic Patent References:
| WO2019188643A1 | 2019-10-03 | |||
| WO2017169940A1 | 2017-10-05 | |||
| WO2009096596A1 | 2009-08-06 | |||
| WO2018030503A1 | 2018-02-15 |
Foreign References:
| JP2015147966A | 2015-08-20 | |||
| US20170260602A1 | 2017-09-14 | |||
| JP2020001530A | 2020-01-09 | |||
| JP5659929B2 | 2015-01-28 |
Other References:
See also references of EP 4089187A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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