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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 9725795 B1

PDFFull Text
Date of Patent:
Aug. 08, 2017

Filed:

Dec. 25, 2012

Galvannealed steel sheet and method of manufacturing the same

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Takeshi Yasui, Ichihara, JP;

Kojiro Akiba, Tokai, JP;

Kiyokazu Ishizuka, Himeji, JP;

Koki Tanaka, Yokohama, JP;

Assignee:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
C22C 38/38 (2006.01); C22C 38/16 (2006.01); C22C 38/08 (2006.01); C22C 38/14 (2006.01); C22C 38/12 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C22C 18/04 (2006.01); C22C 18/00 (2006.01); C22C 38/18 (2006.01); C23C 2/06 (2006.01); C21D 1/48 (2006.01); C21D 1/84 (2006.01); C21D 1/26 (2006.01); C21D 6/00 (2006.01); C23F 17/00 (2006.01); B32B 15/01 (2006.01); C23C 28/00 (2006.01); C23C 30/00 (2006.01); B32B 15/18 (2006.01); B32B 15/04 (2006.01); C23C 2/02 (2006.01); C23C 2/28 (2006.01); C22C 38/58 (2006.01); C21D 1/74 (2006.01); C21D 8/04 (2006.01); C21D 9/56 (2006.01);
U.S. Cl.
CPC ...
C22C 38/38 (2013.01); B32B 15/013 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); C21D 1/26 (2013.01); C21D 1/48 (2013.01); C21D 1/74 (2013.01); C21D 1/84 (2013.01); C21D 6/004 (2013.01); C21D 8/0478 (2013.01); C21D 9/561 (2013.01); C22C 18/00 (2013.01); C22C 18/04 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/18 (2013.01); C22C 38/58 (2013.01); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/28 (2013.01); C23C 28/321 (2013.01); C23C 28/322 (2013.01); C23C 28/345 (2013.01); C23C 30/00 (2013.01); C23C 30/005 (2013.01); C23F 17/00 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 2211/004 (2013.01); Y10T 428/12792 (2015.01); Y10T 428/12799 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/12979 (2015.01); Y10T 428/24942 (2015.01); Y10T 428/24967 (2015.01); Y10T 428/265 (2015.01);
Abstract

A galvannealed steel sheet includes: a steel sheet; a coating layer on a surface of the steel sheet; and a mixed layer formed between the steel sheet and the coating layer, in which the mixed layer includes a base iron portion having fine grains having a size of greater than 0 μm and equal to or smaller than 2 μm, a Zn—Fe alloy phase, and oxides containing one or more types of Mn, Si, Al, and Cr, and in the mixed layer, the oxides and the Zn—Fe alloy phase are present in grain boundaries that form the fine grains and the Zn—Fe alloy phase is tangled with the base iron portion.[Mn]+[Si]+[Al]+[Cr]≧0.4  (Expression 1)

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