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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 11962184 B1

PDFFull Text
Date of Patent:
Apr. 16, 2024

Filed:

Jun. 15, 2020

Method for producing non-oriented electrical steel sheet, method for producing motor core, and motor core

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Yoshiaki Zaizen, Tokyo, JP;

Yoshihiko Oda, Tokyo, JP;

Tomoyuki Okubo, Tokyo, JP;

Takaaki Tanaka, Tokyo, JP;

Yukino Miyamoto, Tokyo, JP;

Assignee:

JFE Steel Corporation, Tokyo, JP;

Attorney:

Buchanan Ingersoll & Rooney PC

Primary Examiner:

Thomas Truong

Int. Cl.
CPC ...
H02K 1/02 (2006.01); B32B 15/00 (2006.01); B32B 15/01 (2006.01); C21D 6/00 (2006.01); C21D 8/12 (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 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/60 (2006.01); H02K 15/02 (2006.01);
U.S. Cl.
CPC ...
H02K 1/02 (2013.01); B32B 15/011 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 8/1261 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/60 (2013.01); H02K 15/02 (2013.01); B32B 2307/732 (2013.01); C22C 2202/02 (2013.01);
Abstract

In the production of a non-oriented electrical steel sheet by subjecting a steel slab having a certain component composition to a hot rolling, a hot-band annealing, a cold rolling and a finish annealing, the conditions of the finish annealing are controlled such that a yield stress of the steel sheet after the finish annealing is not less than 480 MPa. Also, when a motor core is produced by using the above steel sheet, there can be provided a non-oriented electrical steel sheet capable of producing a rotor core and a stator core as the same raw material where the stator core is subjected to a stress relief annealing at a soaking temperature of 780 to 950° C. in an atmosphere having a nitrogen content of not more than 30 vol % and a dew point of not higher than −20° C., while a motor core is produced with such a steel sheet.

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