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:
Nov. 05, 2024
Filed:
Jan. 08, 2020
Nippon Steel Corporation, Tokyo, JP;
Ryutaro Yamagata, Tokyo, JP;
Ichiro Tanaka, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
Grain-oriented electrical steel sheet excellent in magnetic properties and excellent in adhesion of the primary coating to the steel sheet is provided. The grain-oriented electrical steel sheet according to the present invention is provided with a base metal steel sheet containing a chemical composition containing, by mass %, C: 0.005% or less, Si: 0.5 to 7.0%, Mn: 0.05 to 1.00%, a total of S and Se: 0.005% or less, sol. Al: 0.005% or less, and N: 0.005% or less and having a balance comprised of Fe and impurities and with a primary coating formed on a surface of the base metal steel sheet and containing MgSiOas a main constituent, wherein a peak position of Al emission intensity obtained when performing elemental analysis by glow discharge optical emission spectrometry from a surface of the primary coating in a thickness direction of the grain-oriented electrical steel sheet is arranged within a range of 2.0 to 12.0 μm from the surface of the primary coating in the thickness direction, and a number density of Al oxides of a size of 0.1 μm or more in terms of a circle equivalent diameter based on the area at the peak position of Al emission intensity is 0.03 to 0.2/μm.