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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 9273371 B1

PDFFull Text
Date of Patent:
Mar. 01, 2016

Filed:

Mar. 15, 2011

Manufacturing method of grain-oriented electrical steel sheet

Applicants:

Kenichi Murakami, Tokyo, JP;

Chie Hama, Tokyo, JP;

Kazumi Mizukami, Tokyo, JP;

Yoshiyuki Ushigami, Tokyo, JP;

Shuichi Nakamura, Tokyo, JP;

Inventors:

Kenichi Murakami, Tokyo, JP;

Chie Hama, Tokyo, JP;

Kazumi Mizukami, Tokyo, JP;

Yoshiyuki Ushigami, Tokyo, JP;

Shuichi Nakamura, Tokyo, JP;

Assignee:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Jessee Roe

Int. Cl.
CPC ...
C23C 8/02 (2006.01); C23C 8/26 (2006.01); C21D 8/12 (2006.01); C21D 3/04 (2006.01); C21D 6/00 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/34 (2006.01); C22C 38/60 (2006.01); H01F 1/18 (2006.01); C23C 8/80 (2006.01); B21B 3/00 (2006.01); B21B 3/02 (2006.01);
U.S. Cl.
CPC ...
C21D 8/1222 (2013.01); C21D 3/04 (2013.01); C21D 6/008 (2013.01); C21D 8/12 (2013.01); C21D 8/1255 (2013.01); C21D 8/1272 (2013.01); C21D 8/1283 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/34 (2013.01); C22C 38/60 (2013.01); C23C 8/02 (2013.01); C23C 8/80 (2013.01); H01F 1/18 (2013.01); B21B 3/00 (2013.01); B21B 3/02 (2013.01); C21D 2201/05 (2013.01);
Abstract

A predetermined steel containing Te: 0.0005 mass % to 0.0050 mass % is heated to 1320° C. or lower to be subjected to hot rolling, and is subjected to annealing, cold rolling, decarburization annealing, and nitridation annealing, and thereby a decarburized nitrided steel sheet is obtained. Further, an annealing separating agent is applied on the surface of the decarburized nitrided steel sheet and finish annealing is performed, and thereby a glass coating film is formed. The N content of the decarburized nitrided steel sheet is set to 0.0150 mass % to 0.0250 mass % and the relationship of 2×[Te]+[N]≦0.0300 mass % is set to be established. Note that [Te] represents the Te content and [N] represents the N content.

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