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:
Nov. 21, 2017
Filed:
Jun. 15, 2012
Daisuke Harako, Kurashiki, JP;
Yusuke Fushiwaki, Chiyoda-ku, JP;
Yoshitsugu Suzuki, Fukuyama, JP;
Yasunobu Nagataki, Chiyoda-ku, JP;
Daisuke Harako, Kurashiki, JP;
Yusuke Fushiwaki, Chiyoda-ku, JP;
Yoshitsugu Suzuki, Fukuyama, JP;
Yasunobu Nagataki, Chiyoda-ku, JP;
JFE STEEL CORPORATION, Tokyo, JP;
Abstract
A galvannealed steel sheet includes a zinc coating layer containing 7 to 15% Fe on the surface of steel sheet including, C: 0.02% to 0.30%, Si: 0.01% to 2.5%, Mn: 0.1% to 3.0%, P: 0.003% to 0.08%, S: not more than 0.01%, Al: 0.001% to 0.20%, one or more selected from Ti: 0.03% to 0.40%, Nb: 0.001% to 0.2%, V: 0.001% to 0.2%, Mo: 0.01% to 0.5% and W: 0.001% to 0.2%. In the zinc coating layer, carbides with average particle size of 1 nm to 20 nm including one or more selected from titanium, niobium, vanadium, molybdenum and tungsten are present with a density of five or more particles per segment that is defined by the thickness of the coating layer and also by dividing a cross section of the coating layer at intervals of 1 μm in a direction perpendicular to the thickness of the coating layer.