Title:
HIGH-Mn STEEL AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/199145
Kind Code:
A1
Abstract:
The present invention proposes a method for imparting better ductility to high-Mn steel that has superior cryogenic toughness in both a welding heat-affected part and a matrix after being welded. This high-Mn steel has a component composition comprising, in mass%, 0.30-0.90% of C, 0.05-1.0% of Si, 15-30% of Mn, not more than 0.030% of P, not more than 0.0070% of S, 0.01-0.07% of Al, 0.5-7.0% of Cr, 0.0050-0.0500% of N, not more than 0.0050% of O, the respective contained amounts of Ti and Nb being at suppressed levels of less than 0.005%, with the remaining portion being Fe and unavoidable impurities, wherein the high-Mn steel has a microstructure including austenite as a matrix phase, the area fraction of non-metal inclusion in the microstructure is less than 5.0%, and the high-Mn steel has a yield strength of at least 400 MPa and an absorption energy (vE-196) of at least 100 J.
Inventors:
ARAO RYO (JP)
IZUMI DAICHI (JP)
UEDA KEIJI (JP)
HASE KAZUKUNI (JP)
IZUMI DAICHI (JP)
UEDA KEIJI (JP)
HASE KAZUKUNI (JP)
Application Number:
PCT/JP2018/016764
Publication Date:
November 01, 2018
Filing Date:
April 25, 2018
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C22C38/38; C22C38/58
Foreign References:
| JP2016084529A | 2016-05-19 | |||
| JP2011246817A | 2011-12-08 | |||
| JP2017071817A | 2017-04-13 | |||
| CA2970151A1 | 2016-06-30 | |||
| JP2017507249A | 2017-03-16 | |||
| JP2016196703A | 2016-11-24 | |||
| JP2017087702A | 2017-05-25 |
Other References:
See also references of EP 3617337A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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