Title:
HOT STAMP MOLDED BODY
Document Type and Number:
WIPO Patent Application WO/2021/141103
Kind Code:
A1
Abstract:
This hot stamp molded body has a microstructure which has a specific chemical composition, while containing 5% by area or more but less than 10% by area of residual austenite, wherein, among the grain boundaries of crystal grains of bainite and tempered martensite, the ratio of the length of a grain boundary having a rotation angle of from 55° to 75° to the sum of the length of a grain boundary having a rotation angle of from 4° to 12°, the length of a grain boundary having a rotation angle of from 49° to 54° and the length of the grain boundary having a rotation angle of from 55° to 75° is 30% or more as measured using the <011> direction as the rotation axis. This hot stamp molded body has a tensile strength of 1,500 MPa or more.
Inventors:
TODA YURI (JP)
TABATA SHINICHIRO (JP)
MURASAWA KODAI (JP)
MAEDA DAISUKE (JP)
HIKIDA KAZUO (JP)
TABATA SHINICHIRO (JP)
MURASAWA KODAI (JP)
MAEDA DAISUKE (JP)
HIKIDA KAZUO (JP)
Application Number:
PCT/JP2021/000432
Publication Date:
July 15, 2021
Filing Date:
January 08, 2021
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/60; C21D1/18; C21D9/00
Domestic Patent References:
| WO2018033960A1 | 2018-02-22 | |||
| WO2019186930A1 | 2019-10-03 | |||
| WO2020241258A1 | 2020-12-03 | |||
| WO2020195009A1 | 2020-10-01 | |||
| WO2016199922A1 | 2016-12-15 | |||
| WO2018033960A1 | 2018-02-22 |
Foreign References:
| JP2014118613A | 2014-06-30 | |||
| JP2020002407A | 2020-01-09 | |||
| JP2017053001A | 2017-03-16 |
Other References:
See also references of EP 4089191A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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