Title:
HIGH-MN STEEL AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/044928
Kind Code:
A1
Abstract:
Provided is a high-Mn steel that has superior cryogenic toughness and that allows a reduction in material cost and manufacturing cost. This high-Mn steel has a component composition containing, in mass%, 0.100-0.700% of C, 0.05-1.00% of Si, 20.0-35.0% of Mn, 0.030% or less of P, 0.0070% or less of S, 0.01-0.07% of Al, 0.5-7.0% of Cr, 0.0050-0.0500% of N, 0.0050% or less of O, 0.0050% or less of Ti, and 0.0050% or less of Nb, the remaining portion being Fe and incidental impurities, and has a microstructure including austenite as a matric phase, wherein the Mn segregation portion of the microstructure has a Mn concentration of 16-38%, and the average KAM value is 0.3 or more.
Inventors:
IZUMI DAICHI (JP)
UEDA KEIJI (JP)
HASE KAZUKUNI (JP)
NAKASHIMA KOICHI (JP)
UEDA KEIJI (JP)
HASE KAZUKUNI (JP)
NAKASHIMA KOICHI (JP)
Application Number:
PCT/JP2018/032022
Publication Date:
March 07, 2019
Filing Date:
August 29, 2018
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C22C38/38
Foreign References:
| JP2007126715A | 2007-05-24 | |||
| JP2017071817A | 2017-04-13 | |||
| JP2016196703A | 2016-11-24 | |||
| JPS5867824A | 1983-04-22 | |||
| JPS60204864A | 1985-10-16 | |||
| JPS57200543A | 1982-12-08 | |||
| JPS56258A | 1981-01-06 | |||
| US5833919A | 1998-11-10 | |||
| JP2017071817A | 2017-04-13 |
Other References:
See also references of EP 3677700A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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