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:
Dec. 13, 2011
Filed:
Mar. 27, 2008
Shinjiro Kaneko, Tokyo, JP;
Hiroshi Matsuda, Tokyo, JP;
Yoshiyasu Kawasaki, Tokyo, JP;
Tatsuya Nakagaito, Tokyo, JP;
Yoshitsugu Suzuki, Tokyo, JP;
Yusuke Fushiwaki, Tokyo, JP;
Takashi Kawano, Tokyo, JP;
Saiji Matsuoka, Tokyo, JP;
Shinjiro Kaneko, Tokyo, JP;
Hiroshi Matsuda, Tokyo, JP;
Yoshiyasu Kawasaki, Tokyo, JP;
Tatsuya Nakagaito, Tokyo, JP;
Yoshitsugu Suzuki, Tokyo, JP;
Yusuke Fushiwaki, Tokyo, JP;
Takashi Kawano, Tokyo, JP;
Saiji Matsuoka, Tokyo, JP;
JFE Steel Corporation, , JP;
Abstract
A high-strength galvanized steel sheet is provided which has a tensile strength of a level of about 590 MPa and superior formability, including a coating with good appearance. The galvanized steel sheet includes a base steel and a galvanized coating layer formed over the surface of the base steel. The galvanized steel sheet has a chemical composition containing 0.005% to 0.12% of C, 0.7% to 2.7% of Si, 0.5% to 2.8% of Mn, 0.1% or less of P, 0.07% or less of S, 1.0% or less of Al, 0.008% or less of N, and the balance being Fe and inevitable impurities on a mass basis, and a microstructure constituted of at least 90% of ferrite and 2% to 10% of martensite on an area basis. The ferrite has a Vickers hardness of 120 or more on average, and an inclusion is precipitated from the grain boundary with a length of 50% or less relative to the entire length of the grain boundary in the surface layer of the base steel with a depth of 3 μm from the interface between the coating layer and the base steel.