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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 10087500 B1

PDFFull Text
Date of Patent:
Oct. 02, 2018

Filed:

May. 19, 2014

Method for manufacturing high-strength galvannealed steel sheet

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Yoichi Makimizu, Tokyo, JP;

Yoshitsugu Suzuki, Tokyo, JP;

Yasunobu Nagataki, Tokyo, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Jessee R Roe

Assistant Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01); C21D 1/26 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/58 (2006.01); C21D 1/74 (2006.01); C21D 6/00 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/34 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01); C23C 2/02 (2006.01); C23C 2/12 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 1/26 (2013.01); C21D 1/74 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/34 (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); C22C 38/58 (2013.01); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/12 (2013.01); C23C 2/28 (2013.01); C23C 2/285 (2013.01); C23C 2/40 (2013.01);
Abstract

There is provided a method for manufacturing a high-strength galvannealed steel sheet having excellent coating adhesiveness and corrosion resistance whose base material is a high-strength steel sheet containing Si and Mn. The method includes performing an oxidation treatment on a steel sheet including Si and Mn in a first zone having an atmosphere of an oxygen concentration in the range of more than 0 vol % and less than 1 vol %, thereafter performing an oxidation treatment in a second zone having an atmosphere of an oxygen concentration in the range of 1 vol % or more, thereafter performing reduction annealing and galvanizing, and further performing an alloying treatment by heating the galvanized steel sheet.

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