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.:
Date of Patent:
Sep. 13, 2011
Filed:
Apr. 26, 2006
Satoshi Arai, Hyogo, JP;
Hideyuki Hamamura, Chiba, JP;
Tatsuhiko Sakai, Chiba, JP;
Kaoru Sato, Hyogo, JP;
Hideyuki Kobayashi, Hyogo, JP;
Satoshi Arai, Hyogo, JP;
Hideyuki Hamamura, Chiba, JP;
Tatsuhiko Sakai, Chiba, JP;
Kaoru Sato, Hyogo, JP;
Hideyuki Kobayashi, Hyogo, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
An object of the present invention is to provide a grain-oriented electrical steel sheet with low core loss and low magnetostriction and a method for producing the same. The grain-oriented electrical steel sheet is excellent in reduced core loss and magnetostriction while under a high flux density of 1.9 T, comprises a refined magnetic domain comprising a laser irradiated portion which has melted and resolidified to form a solidified layer, wherein the thickness of the solidified layer is 4 μm or less. The grain-oriented electrical steel sheet may further comprise a laser irradiated portion where a surface roughness Rz is small and a cross section viewed from a transverse direction has a concave portion having a width of 200 μm or less and a depth of 10 μm or less for further improvement.