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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 10889880 B1

PDFFull Text
Date of Patent:
Jan. 12, 2021

Filed:

Mar. 04, 2016

Grain-oriented electrical steel sheet and method for manufacturing same

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Takeshi Imamura, Tokyo, JP;

Masanori Takenaka, Tokyo, JP;

Yuiko Wakisaka, Tokyo, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

Kenja IP Law PC

Primary Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C22C 38/60 (2006.01); H01F 1/16 (2006.01); C21D 8/12 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/12 (2006.01); C22C 38/16 (2006.01); C21D 1/78 (2006.01); C22C 38/18 (2006.01); C22C 38/20 (2006.01); C22C 38/34 (2006.01); C22C 38/08 (2006.01); C22C 38/22 (2006.01); C21D 1/84 (2006.01); C21D 6/00 (2006.01);
U.S. Cl.
CPC ...
C22C 38/60 (2013.01); C21D 1/78 (2013.01); C21D 1/84 (2013.01); C21D 6/005 (2013.01); C21D 8/12 (2013.01); C21D 8/125 (2013.01); C21D 8/1244 (2013.01); C21D 8/1272 (2013.01); C21D 8/1277 (2013.01); C21D 8/1283 (2013.01); C21D 8/1288 (2013.01); C21D 9/46 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/16 (2013.01); C22C 38/18 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/34 (2013.01); H01F 1/16 (2013.01); C21D 6/001 (2013.01); C21D 6/002 (2013.01); C21D 6/004 (2013.01); C21D 6/008 (2013.01); C21D 8/1266 (2013.01); C21D 2201/05 (2013.01);
Abstract

Provided are a grain-oriented electrical steel sheet with low iron loss even when including at least one grain boundary segregation element among Sb, Sn, Mo, Cu, and P, and a method for manufacturing the same. In our method, Pr is controlled to satisfy Pr≤−0.075T+18, where T>10, 5<Pr, T (hr) is the time required after final annealing to reduce the temperature of a secondary recrystallized sheet from 800° C. to 400° C., and Pr (MPa) is the line tension on the secondary recrystallized sheet during flattening annealing. As a result, a grain-oriented electrical steel sheet in which iron loss is low and a dislocation density near crystal grain boundaries of the steel substrate is 1.0×10mor less can be obtained even when the grain-oriented electrical steel sheet contains at least one of Sb, Sn, Mo, Cu, and P.

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