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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 10988836 B1

PDFFull Text
Date of Patent:
Apr. 27, 2021

Filed:

Feb. 16, 2017

Method for producing high-strength galvanized steel sheet

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Yoichi Makimizu, Tokyo, JP;

Yoshitsugu Suzuki, Tokyo, JP;

Gentaro Takeda, Tokyo, JP;

Hiroshi Hasegawa, Tokyo, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Alexandra M Moore

Assistant Examiner:

Austin Pollock

Int. Cl.
CPC ...
C23C 2/02 (2006.01); C21D 9/46 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C23C 2/06 (2006.01); C21D 1/26 (2006.01); C22C 38/08 (2006.01); C21D 1/76 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C21D 9/56 (2006.01); C22C 38/28 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/22 (2006.01); C22C 38/26 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01); C22C 38/60 (2006.01);
U.S. Cl.
CPC ...
C23C 2/02 (2013.01); C21D 1/26 (2013.01); C21D 1/76 (2013.01); C21D 9/46 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/08 (2013.01); C23C 2/06 (2013.01); C21D 9/561 (2013.01); C22C 38/008 (2013.01); C22C 38/06 (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 38/32 (2013.01); C22C 38/38 (2013.01); C22C 38/60 (2013.01); C22C 2204/00 (2013.01);
Abstract

A method for producing a high-strength galvanized steel sheet having excellent fatigue resistance properties. The method includes an oxidation processing in which a steel sheet is heated at a temperature of 400 to 750° C. in an atmosphere having an Oconcentration of 1000 ppm by volume or more and a HO concentration of 1000 ppm by volume or more, and the steel sheet is heated at a temperature of 600 to 850° C. in an atmosphere having an Oconcentration of less than 1000 ppm by volume and a HO concentration of 1000 ppm by volume or more. The method also includes reduction-annealing in which the steel sheet is heated at a heating rate of 0.1° C./sec or more to a temperature of 650 to 900° C. in an atmosphere having a Hconcentration of 5 to 30 vol % and a HO concentration of 10 to 1000 ppm by volume.

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