Title:
STEEL PLATE FOR HOT STAMPING, METHOD FOR MANUFACTURING SAME, HOT STAMP MEMBER, AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2022/080489
Kind Code:
A1
Abstract:
This steel plate for hot stamping has a chemical composition containing, in terms of mass%, 0.060-0.120% of C, 0-0.70% of Si, 1.60-3.00% of Mn, 0.100% or less of P, 0.0100% or less of S, 0.0100% or less of N, 0.001-0.100% of Al, 0.005-0.050% of Ti, and 0.0005-0.0100% of B, and furthermore containing, as necessary, one or more substances from among Nb, V, W, Ni, Cu, C, Mo, Sn, Ca, Mg, and REM, the balance being Fe and unavoidable impurities. In the steel plate for hot stamping, the microstructure includes at least 70% of upper bainite by area ratio, and the number density of iron-based carbides having a long diameter of 0.1 μm or greater contained in the upper bainite is 4 per μm2 or greater.
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Inventors:
AZUMA MASAFUMI (JP)
TODA YURI (JP)
OTSUKA KENICHIRO (JP)
TODA YURI (JP)
OTSUKA KENICHIRO (JP)
Application Number:
PCT/JP2021/038278
Publication Date:
April 21, 2022
Filing Date:
October 15, 2021
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D1/18; C21D9/00; C21D9/46; C22C38/58
Domestic Patent References:
| WO2014027682A1 | 2014-02-20 | |||
| WO2016163468A1 | 2016-10-13 | |||
| WO2021145445A1 | 2021-07-22 |
Foreign References:
| US20160130675A1 | 2016-05-12 | |||
| KR20090071177A | 2009-07-01 | |||
| JP2020174457A | 2020-10-22 | |||
| JP5407168B2 | 2014-02-05 | |||
| JP2002102980A | 2002-04-09 |
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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