Invention Grant
- Patent Title: Hot pressing method for high strength member using steel sheet and hot pressed parts
- Patent Title (中): 使用钢板和热压部件的高强度部件的热压方法
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Application No.: US11572020Application Date: 2005-07-15
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Publication No.: US07867344B2Publication Date: 2011-01-11
- Inventor: Kazuhisa Kusumi , Jun Maki , Masayuki Abe , Masahiro Ohgami , Norihiro Fujita , Shinya Nakajima
- Applicant: Kazuhisa Kusumi , Jun Maki , Masayuki Abe , Masahiro Ohgami , Norihiro Fujita , Shinya Nakajima
- Applicant Address: JP Chiyoda-ku, Tokyo
- Assignee: Nippon Steel Corporation
- Current Assignee: Nippon Steel Corporation
- Current Assignee Address: JP Chiyoda-ku, Tokyo
- Agency: Dorsey & Whitney LLP
- Priority: JP2004-208326 20040715; JP2005-203748 20050713
- International Application: PCT/JP2005/013518 WO 20050715
- International Announcement: WO2006/006742 WO 20060119
- Main IPC: C21D8/02
- IPC: C21D8/02 ; B32B15/18

Abstract:
A method is proved for hot pressing hot rolled steel sheet, cold rolled steel sheet, Al-based plated steel sheet or Zn-based plated steel sheet, where the hot pressed sheet can exhibit a strength of at least about 1200 Mpa, and my be prevented from exhibiting hydrogen embrittlement. The steel sheet may include between about 0.05 to 0.5 wt % C, and/or it may be plated with an Al-based or Zn-based plating material. The steel sheet may be heating to a temperature greater than an Ac3 temperature and not more than about 1100° C. before pressing. An atmosphere can be provided during heating which contains not more than about 6 vol % of hydrogen and a dew point of not more than about 10° C. The exemplary methods may be used to form high strength parts which may be used, e.g., in automobiles.
Public/Granted literature
- US20070163685A1 Hot pressing method for high strength member using steel sheet and hot pressed parts Public/Granted day:2007-07-19
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