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:
Mar. 02, 2004
Filed:
Oct. 21, 2002
Shoichiro Taira, Fukuyama, JP;
Yoshiharu Sugimoto, Fukuyama, JP;
Junichi Inagaki, late of Yokohama, JP;
Toru Imokawa, Fukuyama, JP;
Shuji Nomura, Fukuyama, JP;
Michitaka Sakurai, Fukuyama, JP;
Masaaki Yamashita, Fukuyama, JP;
Kaoru Sato, Yokohama, JP;
Masayasu Nagoshi, Kawasaki, JP;
Akira Gamou, Fukuyama, JP;
Yoichi Miyakawa, Kasaoka, JP;
Shunsaku Node, Kasaoka, JP;
Masahiro Iwabuchi, Fukuyama, JP;
NKK Corporation, Tokyo, JP;
Abstract
The invention provides a galvannealed steel sheet which has an oxide layer having 10 nm or larger thickness on the plateau of the coating layer flattened by temper rolling. With the use of the galvannealed steel sheet, no powdering occurs during press-forming, and stable and excellent sliding performance is attained. By selecting the area percentage of the plateau of the flattened coating layer to a range from 20 to 80%, making the coating layer single layer of &dgr; phase, and letting &zgr; phase exist in the &dgr; phase, further improved sliding performance and anti-powdering property are obtained.