Title:
STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2018/051402
Kind Code:
A1
Abstract:
A steel sheet of an embodiment of the present invention has chemical components within specific ranges. The metal structure of 1/4 of the sheet thickness of the steel sheet includes, by unit area%: 10% or greater but less than 50% of ferrite; 5% or greater but less than 50% of granular bainite; and 20% or greater but less than 60% of martensite. In the metal structure of 1/4 of the sheet thickness of the steel sheet, the total of upper bainite, lower bainite, retained austenite, and pearlite is, by unit area%, 0% or greater but less than 15%. In the 1/4 of the sheet thickness of the steel sheet, the product of the area% Vm of the martensite and the average hardness Hv of the martensite is 12,000 to 34,000, and the tensile strength is 980 MPa or greater.
Inventors:
TODA YURI (JP)
HAYASHI KUNIO (JP)
NAKANO KATSUYA (JP)
KAWATA HIROYUKI (JP)
UENISHI AKIHIRO (JP)
HAYASHI KUNIO (JP)
NAKANO KATSUYA (JP)
KAWATA HIROYUKI (JP)
UENISHI AKIHIRO (JP)
Application Number:
PCT/JP2016/076941
Publication Date:
March 22, 2018
Filing Date:
September 13, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/16; C23C2/06; C23C2/28
Domestic Patent References:
| WO2012081666A1 | 2012-06-21 |
Foreign References:
| JP2007009317A | 2007-01-18 | |||
| JP2011052271A | 2011-03-17 | |||
| JP2007070659A | 2007-03-22 | |||
| JP2009001909A | 2009-01-08 | |||
| US20140166163A1 | 2014-06-19 | |||
| CN105734410A | 2016-07-06 |
Other References:
See also references of EP 3514250A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
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