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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 9234268 B1

PDFFull Text
Date of Patent:
Jan. 12, 2016

Filed:

Jul. 27, 2012

High-strength galvanized steel sheet excellent in bendability and manufacturing method thereof

Applicants:

Hiroyuki Kawata, Tokyo, JP;

Naoki Maruyama, Tokyo, JP;

Akinobu Murasato, Tokyo, JP;

Akinobu Minami, Tokyo, JP;

Takeshi Yasui, Tokyo, JP;

Takuya Kuwayama, Tokyo, JP;

Shigeru Yonemura, Tokyo, JP;

Inventors:

Hiroyuki Kawata, Tokyo, JP;

Naoki Maruyama, Tokyo, JP;

Akinobu Murasato, Tokyo, JP;

Akinobu Minami, Tokyo, JP;

Takeshi Yasui, Tokyo, JP;

Takuya Kuwayama, Tokyo, JP;

Shigeru Yonemura, Tokyo, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Humera Sheikh

Assistant Examiner:

Seth Dumbris

Int. Cl.
CPC ...
B32B 15/00 (2006.01); C23C 2/02 (2006.01); C23C 2/28 (2006.01); B32B 15/01 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C21D 8/04 (2006.01); C21D 9/48 (2006.01); C21D 8/02 (2006.01); C23C 2/06 (2006.01); C23C 2/26 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/34 (2006.01); C22C 38/38 (2006.01); C22C 18/00 (2006.01);
U.S. Cl.
CPC ...
C23C 2/02 (2013.01); B32B 15/013 (2013.01); C21D 8/0263 (2013.01); C21D 8/041 (2013.01); C21D 8/0436 (2013.01); C21D 8/0473 (2013.01); C21D 9/48 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/34 (2013.01); C22C 38/38 (2013.01); C23C 2/06 (2013.01); C23C 2/26 (2013.01); C23C 2/28 (2013.01); C21D 2211/001 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); C22C 18/00 (2013.01); Y10T 428/12611 (2015.01); Y10T 428/12799 (2015.01);
Abstract

The present invention provides a high-strength galvanized steel sheet with maximum tensile strength of 900 MPa or more. The high-strength galvanized steel sheet has an alloyed galvanized layer formed on a surface of a base steel sheet containing predetermined amounts of C, Si, Mn, P, S, Al, N, O with a balance being constituted of iron and inevitable impurities, in which in a structure of the base steel sheet, retained austenite is limited to 8% or less in volume fraction, kurtosis K* of the hardness distribution between 2% hardness and 98% hardness is −0.30 or less, a ratio between Vickers hardness of surface layer of the base steel sheet and Vickers hardness of ¼ thickness of the base steel sheet is 0.35 to 0.70, and a content of iron in the alloyed galvanized layer is 8 to 12% in mass %.

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