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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 10449751 B1

PDFFull Text
Date of Patent:
Oct. 22, 2019

Filed:

Mar. 07, 2013

Method for manufacturing high strength galvanized steel sheet

Applicant:

Jfe Steel Corporation, Chiyoda-ku, Tokyo, JP;

Inventors:

Yusuke Fushiwaki, Manchester, GB;

Yoshiyasu Kawasaki, Chiba, JP;

Yasunobu Nagataki, Tokyo, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

RatnerPrestia

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
B32B 15/01 (2006.01); C23C 30/00 (2006.01); C21D 1/26 (2006.01); C23C 2/26 (2006.01); C22C 38/18 (2006.01); C22C 38/16 (2006.01); B32B 15/04 (2006.01); C22C 38/12 (2006.01); C22C 38/20 (2006.01); C22C 38/14 (2006.01); C22C 38/26 (2006.01); B32B 15/18 (2006.01); C22C 38/22 (2006.01); C22C 38/48 (2006.01); C22C 38/32 (2006.01); C22C 38/54 (2006.01); C22C 38/50 (2006.01); C22C 38/42 (2006.01); C22C 38/40 (2006.01); C22C 38/28 (2006.01); C22C 38/44 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01); C21D 9/46 (2006.01); C22C 38/06 (2006.01); C21D 8/02 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C23C 2/40 (2006.01); C21D 9/56 (2006.01); C23C 2/02 (2006.01);
U.S. Cl.
CPC ...
B32B 15/013 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); C21D 8/0284 (2013.01); C21D 9/46 (2013.01); C21D 9/561 (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 38/18 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/40 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/26 (2013.01); C23C 2/28 (2013.01); C23C 2/40 (2013.01); C23C 30/005 (2013.01); C21D 1/26 (2013.01); Y10T 428/12799 (2015.01);
Abstract

A method for manufacturing a high strength galvanized steel sheet which has a zinc coating layer with an amount of deposition of coating of 20 to 120 g/mper one surface on the surface of a base steel sheet having a chemical composition comprising C: 0.03% to 0.35%, Si: 0.01% to 0.50%, Mn: 3.6% to 8.0%, Al: 0.001% to 1.000%, P≤0.10%, S≤0.010%, and the balance comprising Fe and incidental impurities, on a percent by mass basis, is provided. In annealing and galvanization treatment of the base steel sheet in a continuous galvanizing line, the maximum steel sheet temperature in an annealing furnace is 600° C. or higher and 750° C. or lower, the steel sheet transit time in a temperature region of the steel sheet temperature of 600° C. or higher and 750° C. or lower is specified to be 30 seconds or more and 10 minutes or less, and the dew point in an atmosphere is specified to be −10° C. or higher.

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