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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 12392004 B1

PDFFull Text
Date of Patent:
Aug. 19, 2025

Filed:

Feb. 07, 2020

Grain oriented electrical steel sheet, forming method for insulation coating of grain oriented electrical steel sheet, and producing method for grain oriented electrical steel sheet

Applicant:

Nippon Steel Corporation, Tokyo, JP;

Inventors:

Ichiro Tanaka, Tokyo, JP;

Takashi Kataoka, Tokyo, JP;

Kazutoshi Takeda, Tokyo, JP;

Masamitsu Kubota, Tokyo, JP;

Hirotoshi Tada, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Keith D Hendricks

Assistant Examiner:

Joshua S Carpenter

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C21D 3/04 (2006.01); C21D 8/02 (2006.01); C21D 8/12 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); H01F 1/147 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 3/04 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/1272 (2013.01); C21D 8/1283 (2013.01); C22C 38/001 (2013.01); C22C 38/004 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C21D 2201/05 (2013.01); H01F 1/14783 (2013.01);
Abstract

A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When a glow discharge spectroscopy is conducted in a region from a surface of the tension-insulation coating to an inside of the base steel sheet, a sputtering time Feat which a Fe emission intensity becomes 0.5 times as compared with a saturation value thereof and a sputtering time Feat which a Fe emission intensity becomes 0.05 times as compared with the saturation value satisfy 0.01<(Fe−Fe)/Fe<0.35. Moreover, a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.

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