Title:
HIGH STRENGTH STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2018/151322
Kind Code:
A1
Abstract:
Provided is a high strength steel sheet, which comprises a sheet thickness center section and softened surface layer sections disposed on one or both sides of the sheet thickness center section and the tensile strength of which is at least 800 MPa, the high strength steel sheet being characterized in that: each softened surface layer section has a thickness of greater than 10 µm to not more than 30% of the sheet thickness; the average Vickers hardness of the softened surface layer sections is greater than 0.60 times to not more than 0.90 times the average Vickers hardness at the ½ sheet thickness position; and the standard deviation of the nano-hardness of the softened surface layer sections is 0.8 or less.
Inventors:
SUZUKI YUYA (JP)
NAKANO KATSUYA (JP)
ABUKAWA GENKI (JP)
HAYASHI KUNIO (JP)
NAKANO KATSUYA (JP)
ABUKAWA GENKI (JP)
HAYASHI KUNIO (JP)
Application Number:
PCT/JP2018/006053
Publication Date:
August 23, 2018
Filing Date:
February 20, 2018
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/60; C23C2/06
Domestic Patent References:
| WO2011152017A1 | 2011-12-08 | |||
| WO2013047819A1 | 2013-04-04 | |||
| WO2014181728A1 | 2014-11-13 | |||
| WO2016111271A1 | 2016-07-14 | |||
| WO2016111272A1 | 2016-07-14 | |||
| WO2016111273A1 | 2016-07-14 | |||
| WO2016111274A1 | 2016-07-14 | |||
| WO2016111275A1 | 2016-07-14 | |||
| WO2016199922A1 | 2016-12-15 | |||
| WO2016013145A1 | 2016-01-28 |
Foreign References:
| JPH10130782A | 1998-05-19 | |||
| JP2005273002A | 2005-10-06 | |||
| JP2017002384A | 2017-01-05 | |||
| JP2015034334A | 2015-02-19 | |||
| JP2015117403A | 2015-06-25 |
Other References:
See also references of EP 3584348A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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