Title:
HIGH MN STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2018/105510
Kind Code:
A1
Abstract:
Provided are a high Mn steel sheet and a method for producing this high Mn steel sheet. This high Mn steel sheet has a component composition which contains, in mass%, 0.20-0.70% of C, 0.05-1.0% of Si, 15-30% of Mn, 0.028% or less of P, 0.02% or less of S, 0.01-0.1% of Al, 0.5-7.0% of Cr, 0.03-0.30% of Ni and 0.0010-0.0200% of N, while containing one or more of 0.003-0.030% of Nb, 0.03-0.10% V and 0.003-0.040% of Ti, with the balance made up of Fe and unavoidable impurities. With respect to this high Mn steel sheet, the microstructure at 0.5 mm below the steel sheet surface has a matrix phase of austenite; and 25% or more of the austenite in terms of area ratio has a circle-equivalent diameter of 10 μm or more, while having an aspect ratio of the length to the breadth of 3 or more.
More Like This:
Inventors:
UEDA KEIJI (JP)
HASE KAZUKUNI (JP)
HASE KAZUKUNI (JP)
Application Number:
PCT/JP2017/043245
Publication Date:
June 14, 2018
Filing Date:
December 01, 2017
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C22C38/58
Foreign References:
| JP2016196703A | 2016-11-24 | |||
| JPH0143830B2 | 1989-09-22 | |||
| JP2016084529A | 2016-05-19 | |||
| JPS6145697B2 | 1986-10-09 | |||
| JPS5623259A | 1981-03-05 | |||
| US20160319407A1 | 2016-11-03 | |||
| JP2015508452A | 2015-03-19 | |||
| JP2016084529A | 2016-05-19 |
Other References:
DAIGO, ICHIRO ET AL.: "Comparison of Tramp Elements Compositions in Steel Bars between Japan and China", TETSU-TO-HAGANÉ, vol. 100, no. 6, 31 May 2014 (2014-05-31), pages 756 - 760, XP055510095
See also references of EP 3553195A4
See also references of EP 3553195A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
Download PDF:
Previous Patent: COMPRESSOR FOR AN AIR-CONDITIONING INSTALLATION OF A MOTOR VEHICLE
Next Patent: REFRIGERATION DEVICE
Next Patent: REFRIGERATION DEVICE