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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 10138530 B1

PDFFull Text
Date of Patent:
Nov. 27, 2018

Filed:

Dec. 11, 2014

Method for producing high-strength galvannealed steel sheets

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Yoichi Makimizu, Fukuyama, JP;

Yoshitsugu Suzuki, Fukuyama, JP;

Mai Aoyama, Fukuyama, JP;

Hiroshi Hasegawa, Fukuyama, JP;

Gentaro Takeda, Fukuyama, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Deborah Yee

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C21D 1/74 (2006.01); C21D 1/26 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01); C23C 8/14 (2006.01); C23C 8/80 (2006.01); C23C 8/04 (2006.01); C22C 18/04 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/58 (2006.01); C22C 38/02 (2006.01); C21D 8/04 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 1/26 (2013.01); C21D 1/74 (2013.01); C22C 18/04 (2013.01); C22C 38/00 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/58 (2013.01); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/28 (2013.01); C23C 2/40 (2013.01); C23C 8/14 (2013.01); C23C 8/80 (2013.01); C21D 8/04 (2013.01);
Abstract

A method for producing high-strength galvannealed steel sheets having excellent workability and fatigue resistance. The method comprises subjecting a steel sheet to an oxidation treatment, the oxidation treatment including heating the steel sheet in an upstream stage at a temperature in the range of 400° C. to 750° C. in an atmosphere having an Oconcentration of not less than 1000 ppm by volume and a HO concentration of not less than 1000 ppm by volume and a downstream stage at a temperature in the range of 600° C. to 850° C. in an atmosphere having an Oconcentration of less than 1000 ppm by volume and a HO concentration of not less than 1000 ppm by volume. The method further comprises subjecting the steel sheet to reducing annealing, hot-dip galvanizing treatment and alloying treatment.

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