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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 10900113 B1

PDFFull Text
Date of Patent:
Jan. 26, 2021

Filed:

Sep. 04, 2015

Method for manufacturing grain-oriented electrical steel sheet, and nitriding apparatus

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Yukihiro Shingaki, Tokyo, JP;

Hirotaka Inoue, Tokyo, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

Kenja IP Law PC

Primary Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
H01F 1/16 (2006.01); C23C 8/26 (2006.01); C21D 9/46 (2006.01); C23C 8/02 (2006.01); C22C 38/60 (2006.01); C22C 38/00 (2006.01); C21D 8/12 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/16 (2006.01); C22C 38/28 (2006.01); C22C 38/34 (2006.01); C23F 17/00 (2006.01); F27D 7/02 (2006.01); F27B 9/04 (2006.01); F27D 7/06 (2006.01);
U.S. Cl.
CPC ...
C23C 8/26 (2013.01); C21D 8/12 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 8/1272 (2013.01); C21D 8/1277 (2013.01); C21D 9/46 (2013.01); C22C 38/00 (2013.01); C22C 38/002 (2013.01); C22C 38/008 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/16 (2013.01); C22C 38/28 (2013.01); C22C 38/34 (2013.01); C22C 38/60 (2013.01); C23C 8/02 (2013.01); C23F 17/00 (2013.01); H01F 1/16 (2013.01); F27B 9/045 (2013.01); F27D 7/02 (2013.01); F27D 7/06 (2013.01);
Abstract

In a grain-oriented electrical steel sheet manufacturing process of processing a steel slab having a predetermined composition to a final sheet thickness and then performing primary recrystallization annealing and nitriding treatment, the nitriding treatment is performed in at least two stages of temperatures including high-temperature nitriding and low-temperature nitriding, and a residence time in the high-temperature nitriding is 3 seconds or more and 600 seconds or less. In this way, nitrogen is efficiently diffused into the steel of the steel sheet before secondary recrystallization to precipitate AlN. Such a method can manufacture a grain-oriented electrical steel sheet having excellent magnetic property.

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