The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 11, 2011
Filed:
Jul. 15, 2005
Kazuhisa Kusumi, Kitakyushu, JP;
Jun Maki, Kitakyushu, JP;
Masayuki Abe, Kitakyushu, JP;
Masahiro Ohgami, Kitakyushu, JP;
Norihiro Fujita, Tokai, JP;
Shinya Nakajima, Kitakyushu, JP;
Kazuhisa Kusumi, Kitakyushu, JP;
Jun Maki, Kitakyushu, JP;
Masayuki Abe, Kitakyushu, JP;
Masahiro Ohgami, Kitakyushu, JP;
Norihiro Fujita, Tokai, JP;
Shinya Nakajima, Kitakyushu, JP;
Nippon Steel Corporation, Chiyoda-ku, Tokyo, JP;
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 Actemperature 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.