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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 11761074 B1

PDFFull Text
Date of Patent:
Sep. 19, 2023

Filed:

Dec. 17, 2020

Nitriding apparatus for manufacturing a grain-oriented electrical steel sheet

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 ...
F27D 7/02 (2006.01); C23C 8/26 (2006.01); C21D 9/46 (2006.01); C23C 8/02 (2006.01); C22C 38/60 (2006.01); H01F 1/16 (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); 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

A nitriding apparatus for manufacturing a grain-oriented electrical steel sheet is provided. The nitriding apparatus includes: a nitriding gas supply pipe for introducing gas including at least ammonia or nitrogen; and a nitriding treatment portion for successively performing high-temperature nitriding and low-temperature nitriding in nitriding treatment. The nitriding treatment portion includes a high-temperature treatment portion for performing the high-temperature nitriding and a low-temperature treatment portion for performing the low-temperature nitriding, and the nitriding gas supply pipe to the high-temperature treatment portion includes a cooling device.

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