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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 9044920 B1

PDFFull Text
Date of Patent:
Jun. 02, 2015

Filed:

Sep. 28, 2011

High strength galvanized steel sheet exhibiting excellent fatigue property

Applicants:

Nobusuke Kariya, Fukuyama, JP;

Hayato Saito, Fukuyama, JP;

Takeshi Yokota, Chiba, JP;

Yusuke Fushiwaki, Fukuyama, JP;

Inventors:

Nobusuke Kariya, Fukuyama, JP;

Hayato Saito, Fukuyama, JP;

Takeshi Yokota, Chiba, JP;

Yusuke Fushiwaki, Fukuyama, JP;

Assignee:

JFE Steel Corporation, Tokyo, JP;

Attorney:

RatnerPrestia

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
B32B 15/18 (2006.01); C23C 2/02 (2006.01); C21D 8/04 (2006.01); C21D 9/48 (2006.01); C21D 9/56 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/38 (2006.01); C22C 38/60 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01); C21D 8/02 (2006.01);
U.S. Cl.
CPC ...
B32B 15/18 (2013.01); Y10T 428/12667 (2015.01); Y10T 428/12611 (2015.01); Y10T 428/1266 (2015.01); Y10T 428/12618 (2015.01); C21D 8/0226 (2013.01); C21D 8/0436 (2013.01); C21D 8/0473 (2013.01); C21D 9/48 (2013.01); C21D 9/561 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/38 (2013.01); C22C 38/60 (2013.01); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/28 (2013.01);
Abstract

A high strength galvanized steel sheet having tensile strength of 590MPa or more which is excellent in fatigue property in punching work, and a manufacturing method thereof are provided. The microstructure includes a ferrite phase having an average grain diameter of 15 μm or less and an area fraction of 60% or more and a martensite phase having an area fraction of 5 to 40%, and an amount of one or more kinds of oxide selected from a group consisting of Fe, Si, Mn, Al, P, Nb, and Ti generated on a surface layer portion of the steel sheet within 100 μm in a steel-sheet-side depth direction from a surface of a base steel sheet directly below a galvanized layer is less than 0.060 g/mper one-side surface of the steel sheet.

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