Title:
HIGH-MN STEEL AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2020/166538
Kind Code:
A1
Abstract:
Provided is a high-Mn steel having high strength and excellent low-temperature toughness, as well as excellent ductility. This high-Mn steel has: a component composition which contains, in terms of mass%, 0.10% to 0.70% C, 0.10% to 0.90% Si, 20% to 30% Mn, no more than 0.030% P, no more than 0.0070% S, 0.01% to 0.07% Al, 1.8% to 7.0% Cr, 0.01% to less than 1.0% Ni, 0.0005% to 0.010% Ca, 0.0050% to 0.0500% N, no more than 0.0050% O, no more than 0.0050% Ti, and no more than 0.0050% Nb, and which satisfies the expression Ca/S ≥ 1.0, the remainder being Fe and unavoidable impurities; and a structure having austenite as the matrix phase; the yield strength of the high-Mn steel being 400 MPa or greater, and the average value of the Charpy impact absorption energy at -196°C being 100 J or greater when a full-size test piece is used, and 20 J or greater when a half-size test piece is used.
Inventors:
NAKASHIMA KOICHI (JP)
UEDA KEIJI (JP)
ITO YOICHI (JP)
IGI SATOSHI (JP)
ONO TOMOHIRO (JP)
UEDA KEIJI (JP)
ITO YOICHI (JP)
IGI SATOSHI (JP)
ONO TOMOHIRO (JP)
Application Number:
PCT/JP2020/005017
Publication Date:
August 20, 2020
Filing Date:
February 10, 2020
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C22C38/58
Domestic Patent References:
| WO2018199145A1 | 2018-11-01 | |||
| WO2018105510A1 | 2018-06-14 |
Foreign References:
| JP2017155300A | 2017-09-07 | |||
| JP2016084529A | 2016-05-19 | |||
| JP2016196703A | 2016-11-24 | |||
| JPS5118913A | 1976-02-14 | |||
| JP2016084529A | 2016-05-19 | |||
| JP2016196703A | 2016-11-24 |
Other References:
See also references of EP 3926057A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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