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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 9920394 B1

PDFFull Text
Date of Patent:
Mar. 20, 2018

Filed:

Nov. 27, 2014

Bake-hardening galvanized steel sheet

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Kohei Hasegawa, Tokyo, JP;

Koichiro Fujita, Nagoya, JP;

Yusuke Kimata, Fukuyama, JP;

Kozo Harada, Jakarta, ID;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
C22C 38/16 (2006.01); C22C 38/14 (2006.01); C22C 38/12 (2006.01); C22C 38/18 (2006.01); C22C 38/08 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C23C 2/06 (2006.01); C23C 2/40 (2006.01); C23F 17/00 (2006.01); C21D 9/46 (2006.01); C21D 8/02 (2006.01); C21D 1/76 (2006.01); B32B 15/18 (2006.01); B32B 15/04 (2006.01); B32B 15/01 (2006.01); C23C 30/00 (2006.01); C21D 1/74 (2006.01); C22C 38/54 (2006.01); C21D 1/673 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B32B 15/013 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); C21D 1/74 (2013.01); C21D 1/76 (2013.01); C21D 8/0236 (2013.01); C21D 8/0247 (2013.01); C21D 8/0263 (2013.01); C22C 38/00 (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 38/54 (2013.01); C23C 2/06 (2013.01); C23C 2/40 (2013.01); C23C 30/00 (2013.01); C23C 30/005 (2013.01); C23F 17/00 (2013.01); C21D 1/673 (2013.01); C21D 2211/003 (2013.01); C21D 2211/005 (2013.01); Y10T 428/12799 (2015.01); Y10T 428/12951 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/263 (2015.01); Y10T 428/264 (2015.01); Y10T 428/265 (2015.01); Y10T 428/273 (2015.01);
Abstract

A bake-hardening galvanized steel sheet having a base steel sheet and a coating layer formed on the base steel sheet, the base steel sheet having a specified chemical composition and a metallographic structure including a ferrite phase and a cementite phase, in which an average ferrite grain diameter is controlled to be 10 μm or more and 30 μm or less, and in which the surface area of the interface between ferrite and cementite per unit volume is controlled to be 1.0/mm or more and 10.0/mm or less, a hydrogen concentration in steel of the base steel sheet is controlled to be less than 0.1 ppm, and a zinc coating weight per unit surface area of the steel sheet is controlled to be 40 g/mor more and 100 g/mor less.

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