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:
Apr. 03, 2018
Filed:
Oct. 15, 2015
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Shuichi Yamazaki, Tokyo, JP;
Takeshi Kubota, Tokyo, JP;
Yousuke Kurosaki, Tokyo, JP;
Masahiro Fujikura, Tokyo, JP;
Takahide Shimazu, Tokyo, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
A manufacturing method of a non-oriented electrical steel sheet includes: performing finish annealing of a cold-rolled steel strip; and forming a tension-applying type insulating film of not less than 1 g/mand not more than 6 g/mon a surface of the cold-rolled steel strip. The performing the finish annealing includes forming an oxide layer containing AlOor (Al, Cr)Oand having a thickness of not less than 0.01 μm and not more than 0.5 μm on the surface of the cold-rolled steel strip with setting a temperature of the cold-rolled steel strip to not lower than 800° C. and not higher than 1100° C. in an atmosphere where when the total content of Si and Al of the cold-rolled steel strip is represented as X (mass %), a partial pressure ratio of water vapor to hydrogen is equal to or less than 0.005×X.