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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.:

US 9040169 B1

PDFFull Text
Date of Patent:
May. 26, 2015

Filed:

Mar. 30, 2011

Hot-dip galvanized steel sheet and alloyed hot-dip galvanized steel sheet, each having excellent workability, high yield ratio and high strength

Applicants:

Kazuyuki Hamada, Kakogawa, JP;

Tatsuya Asai, Kakogawa, JP;

Inventors:

Kazuyuki Hamada, Kakogawa, JP;

Tatsuya Asai, Kakogawa, JP;

Assignee:

Kobe Steel, Ltd., Kobe-shi, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Mark Ruthkosky

Assistant Examiner:

Daniel J Schleis

Int. Cl.
CPC ...
B32B 15/00 (2006.01); C22C 38/06 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C21D 9/48 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/22 (2006.01); C22C 38/28 (2006.01); C22C 38/38 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01); C21D 8/04 (2006.01);
U.S. Cl.
CPC ...
C22C 38/06 (2013.01); Y10T 428/12799 (2015.01); C21D 8/0236 (2013.01); C21D 8/0273 (2013.01); C21D 9/46 (2013.01); C21D 9/48 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); C22C 38/001 (2013.01); C22C 38/04 (2013.01); C22C 38/22 (2013.01); C22C 38/28 (2013.01); C22C 38/38 (2013.01); C23C 2/06 (2013.01); C23C 2/28 (2013.01); C21D 8/0473 (2013.01);
Abstract

Disclosed is a hot-dip galvanized steel sheet or an alloyed hot-dip galvanized steel sheet, which has a tensile strength of 980 MPa or more, excellent workability, high yield ratio and high strength. The hot-dip galvanized steel sheet or the alloyed hot-dip galvanized steel sheet is characterized by containing 0.12-0.3% by mass of C, 0.1% by mass or less (excluding 0% by mass) of Si, 2.0-3.5% by mass of Mn, 0.05% by mass or less (excluding 0% by mass) of P, 0.05% by mass or less (excluding 0% by mass) of S, 0.005-0.1% by mass of Al and 0.015% by mass or less (excluding 0% by mass) of N, with the balance made up of iron and unavoidable impurities. The hot-dip galvanized steel sheet or the alloyed hot-dip galvanized steel sheet is also characterized in that the metallic structure thereof contains bainite as a matrix structure, and the area ratio of ferrite is 3-20% and the area ratio of martensite is 10-35% relative to the entire structure.

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