Title:
STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2020/138343
Kind Code:
A1
Abstract:
The present invention relates to a steel sheet containing, in terms of % by mass, more than 0.10 to 0.45% C, 0.001-2.50% Si, more than 4.00 to 8.00% Mn, and 0.001-1.50% sol. Al, the metal structure at a position 1/4 the thickness from the surface of the steel sheet including, in terms of area%, 25-90% tempered martensite and 10-50% residual austenite, and the standard deviation of the Mn concentration in a range of 20 µm in the rolling direction and 20 µm in the sheet thickness direction at a position 1/4 the thickness from the surface of the steel sheet being at least 0.30% by mass.
Inventors:
HAYASHI KOUTAROU (JP)
TSUTSUI KAZUMASA (JP)
UENISHI AKIHIRO (JP)
TSUTSUI KAZUMASA (JP)
UENISHI AKIHIRO (JP)
Application Number:
PCT/JP2019/051252
Publication Date:
July 02, 2020
Filing Date:
December 26, 2019
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D9/46; C22C38/00; C22C38/60
Domestic Patent References:
| WO2018216522A1 | 2018-11-29 | |||
| WO2018025675A1 | 2018-02-08 | |||
| WO2018019220A1 | 2018-02-01 |
Foreign References:
| JP2018178248A | 2018-11-15 | |||
| JP2017206771A | 2017-11-24 | |||
| JP2016050337A | 2016-04-11 | |||
| JP2016153524A | 2016-08-25 | |||
| JP2012180570A | 2012-09-20 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Download PDF:
Previous Patent: INFORMATION PROCESSING DEVICE
Next Patent: END EFFECTOR AND ROBOT EQUIPPED WITH SAME
Next Patent: END EFFECTOR AND ROBOT EQUIPPED WITH SAME