Title:
HOT PRESS MEMBER AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2017/068756
Kind Code:
A1
Abstract:
Provided is a hot press member that is provided with all of the following properties: high strength, with tensile strength TS being 1,500 MPa or higher; high ductility, with uniform elongation uEL being 6.0% or higher; and excellent heat treatment curability, with yield stress YS increasing 150 MPa or more upon execution of a heat treatment (baking finish treatment). This hot press member is characterized by having a structure containing a prescribed component composition (specifically, a low C content of at least 0.090% and less than 0.30%, and a high Mn content of at least 3.5% and less than 11.0%), a martensitic phase comprising 70.0 vol% or more, and a retained austenitic phase comprising 3.0-30.0 vol%, inclusive, and in that the dislocation density thereof is 1.0×1016 m2 or higher.
Inventors:
NAKAGAWA KOICHI (JP)
KANEKO SHINJIRO (JP)
YOKOTA TAKESHI (JP)
SETO KAZUHIRO (JP)
KANEKO SHINJIRO (JP)
YOKOTA TAKESHI (JP)
SETO KAZUHIRO (JP)
Application Number:
PCT/JP2016/004458
Publication Date:
April 27, 2017
Filing Date:
October 03, 2016
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; B21D22/20; C21D1/18; C21D9/00; C21D9/46; C22C18/00; C22C38/60
Domestic Patent References:
| WO2013038637A1 | 2013-03-21 | |||
| WO2013047821A1 | 2013-04-04 | |||
| WO2015182596A1 | 2015-12-03 |
Foreign References:
| JP2004211147A | 2004-07-29 | |||
| JP2015503023A | 2015-01-29 | |||
| JP2008144233A | 2008-06-26 | |||
| JPS6217125A | 1987-01-26 |
Other References:
See also references of EP 3366797A4
Attorney, Agent or Firm:
SUGIMURA, Kenji (JP)
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