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:
Apr. 12, 2005
Filed:
Nov. 27, 2002
Kunio Kondo, Mita, JP;
Miyuki Yamamoto, Izumioutsu, JP;
Takashi Takano, Wakayama, JP;
Kenichi Beppu, Wakayama, JP;
Susumu Hirano, Funabashi, JP;
Keisuke Hitoshio, Hannan, JP;
Hidetoshi Kurata, Wakayama, JP;
Kunio Kondo, Mita, JP;
Miyuki Yamamoto, Izumioutsu, JP;
Takashi Takano, Wakayama, JP;
Kenichi Beppu, Wakayama, JP;
Susumu Hirano, Funabashi, JP;
Keisuke Hitoshio, Hannan, JP;
Hidetoshi Kurata, Wakayama, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Abstract
In order to manufacture a steel pipe for an air bag which can cope with increase in the pressure of gas blown into an air bag and decreases in the wall thickness of an accumulator, a steel having a composition, mass %, of: if necessary at least one of Mo: at most 0.50%, Ni: at most 1.5%, Cu: at most 0.5%, V: at most 0.2%, Ti: at most 0.1%, Nb: at most 0.1%, and B: at most 0.005%, and also if necessary, at least one of Ca: at most 0.01%, Mg: at most 0.01%, and REM (rare earth elements): at most 0.01%, and a remainder of Fe and impurities is used to produce a steel pipe, and the pipe is then subjected to cold working to predetermined dimensions, then to heating to a temperature of at least the Actransformation temperature followed by quenching, and then to tempering at a temperature no higher than the Actransformation temperature.