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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 10570474 B1

PDFFull Text
Date of Patent:
Feb. 25, 2020

Filed:

Jun. 15, 2015

Method for manufacturing high-strength galvanized steel sheet

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Mai Aoyama, Fukuyama, JP;

Yoshitsugu Suzuki, Chiba, JP;

Hideyuki Kimura, Fukuyama, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Colleen P Dunn

Assistant Examiner:

Nicholas A Wang

Int. Cl.
CPC ...
C21D 9/46 (2006.01); B21B 3/00 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); C22C 38/06 (2006.01); C22C 38/60 (2006.01); B21B 1/26 (2006.01); C22C 38/00 (2006.01); B21B 1/28 (2006.01); C23C 2/28 (2006.01); B21B 1/22 (2006.01); C21D 8/02 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/22 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/38 (2006.01); C23C 2/40 (2006.01); C23G 1/00 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B21B 1/22 (2013.01); B21B 1/26 (2013.01); B21B 1/28 (2013.01); B21B 3/00 (2013.01); C21D 8/0226 (2013.01); C21D 8/0263 (2013.01); C21D 8/0278 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/008 (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 38/22 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (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); C23C 2/40 (2013.01); C23G 1/00 (2013.01); B21B 2001/225 (2013.01);
Abstract

A method for manufacturing a high-strength galvanized steel sheet. The method includes a first heating step of holding the steel sheet in a temperature range of 750° C. to 880° C. for 20 s to 600 s in an atmosphere having an Hconcentration of 0.05% to 25.0% by volume and a dew point of −45° C. to −10° C., a cooling step, a rolling step of rolling the steel sheet with a rolling reduction of 0.3% to 2.0%, a pickling step of pickling the steel sheet with a pickling weight loss of 0.02 gram/mto 5 gram/min terms of Fe, a second heating step of holding the steel sheet in a temperature range of 720° C. to 860° C. for 20 sec. to 300 sec. in an atmosphere having an Hconcentration of 0.05% to 25.0% by volume and a dew point of −10° C. or lower, and a galvanizing step.

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