Title:
HIGH Mn STEEL SHEET AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/104984
Kind Code:
A1
Abstract:
Provided are a high Mn steel sheet and a production method therefor. The steel sheet has a component composition: containing, in mass%, C: 0.20-0.70%, Si: 0.05-1.0%, Mn: 15-30%, P: 0.028% or less, S: 0.02% or less, Al: 0.01-0.1%, Cr: 0.5-7.0%, Ni: 0.03-0.30%, and N: 0.0010-0.0200%; containing one or more of Nb: 0.003-0.030%, V: 0.03-0.10% and Ti: 0.003-0.040%; the balance Fe and unavoidable impurities. The microstructure that is 0.5 mm under the surface of the steel sheet has austenite as the matrix phase and at least 25% of the area ratio of said austenite has an equivalent circle diameter of at least 10 µm and an aspect ratio of length to width of at least 3.
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Inventors:
UEDA KEIJI (JP)
HASE KAZUKUNI (JP)
HASE KAZUKUNI (JP)
Application Number:
PCT/JP2016/005080
Publication Date:
June 14, 2018
Filing Date:
December 08, 2016
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 |
Other References:
ICHIRO DAIGO ET AL.: "Comparison of Tramp Elements Compositions in Steel Bars between Japan and China", JOURNAL OF THE IRON & STEEL INSTITUTE OF JAPAN, vol. 100, no. 6, 31 May 2014 (2014-05-31), pages 756 - 760, XP055510095
Attorney, Agent or Firm:
KUMASAKA, Akira et al. (JP)
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