Title:
BURRING STRUCTURAL MEMBER
Document Type and Number:
WIPO Patent Application WO/2023/195496
Kind Code:
A1
Abstract:
The present invention provides a burring structural member that is resistant to fracture even when the burring structural part is bent back. In the burring structural member according to the present disclosure: a plate section has a thickness T of 2.0 mm or greater; the Charpy impact value vE(0) of the plate section at 0°C is 50 J/cm2 or greater; a BCI value, calculated according to BCI = vE(0)/Lc on the basis of the Charpy impact value vE(0) (J/cm2) and a maximum length Lc (μm) of a crack on the inner bend side of a curved wall section of the burring structural part, is 2.5 or greater; and the inner bend side of the curved wall section has a radius of curvature R (mm) that is greater than R1 calculated according to R1 = 25/BCI-1.5.
Inventors:
KOBAYASHI SHUNSUKE (JP)
KATO RYOMA (JP)
SHUTO HIROSHI (JP)
KATO RYOMA (JP)
SHUTO HIROSHI (JP)
Application Number:
PCT/JP2023/014139
Publication Date:
October 12, 2023
Filing Date:
April 05, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B21D19/08
Domestic Patent References:
| WO2020195605A1 | 2020-10-01 |
Foreign References:
| JP6536763B1 | 2019-07-03 | |||
| JP5541428B1 | 2014-07-09 | |||
| JP6822611B2 | 2021-01-27 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Download PDF:
Previous Patent: STEEL MATERIAL
Next Patent: ANTIREFLECTION FILM-EQUIPPED TRANSPARENT SUBSTRATE AND IMAGE DISPLAY DEVICE
Next Patent: ANTIREFLECTION FILM-EQUIPPED TRANSPARENT SUBSTRATE AND IMAGE DISPLAY DEVICE