Title:
HIGH-STRENGTH MEMBER, METHOD FOR MANUFACTURING HIGH-STRENGTH MEMBER, AND METHOD FOR MANUFACTURING STEEL SHEET FOR HIGH-STRENGTH MEMBER
Document Type and Number:
WIPO Patent Application WO/2020/230796
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a high-strength member having excellent delayed fracture resistance, a method for manufacturing a high-strength member, and a method for manufacturing a steel sheet for a high-strength member. A high-strength member 10 according to the present invention has a bent ridgeline part 12 obtained by using a steel sheet 11, wherein the tensile strength of the member is no smaller than 1,470 MPa, the residual stress in an end surface 13 of the bent ridgeline part 12 is no greater than 300 MPa, and the Vickers hardness (Hv) of the end surface 13 of the bent ridgeline part 12 is 200 to 450 inclusive.
Inventors:
HIRASHIMA TAKUYA (JP)
KANEKO SHINJIRO (JP)
KANEKO SHINJIRO (JP)
Application Number:
PCT/JP2020/019021
Publication Date:
November 19, 2020
Filing Date:
May 12, 2020
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D9/00; C21D1/30; C21D9/46; C22C38/00; C22C38/06; C22C38/60
Domestic Patent References:
| WO2016152163A1 | 2016-09-29 |
Foreign References:
| JP2017125228A | 2017-07-20 | |||
| JP2017226901A | 2017-12-28 | |||
| JP2012157902A | 2012-08-23 | |||
| US20120060982A1 | 2012-03-15 | |||
| JP2003166035A | 2003-06-13 | |||
| JP2017125228A | 2017-07-20 |
Other References:
See also references of EP 3971308A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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