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:
Dec. 15, 2015
Filed:
Nov. 25, 2011
Takeshi Omura, Chiyoda-ku, JP;
Gou Kijima, Chiyoda-ku, JP;
Makoto Watanabe, Chiyoda-ku, JP;
JFE STEEL CORPORATION, Tokyo, JP;
Abstract
According to the present invention, a grain oriented electrical steel sheet in which iron loss has been further reduced can be obtained by carrying out decarburization annealing as continuous annealing including: (1) heating the steel sheet to a temperature in the range of 700° C. to 750° C. at heating rate of 50° C./second or higher at least in a temperature range of 500° C. to 700° C. in an atmosphere having oxidation potential P(HO)/P(H) equal to or lower than 0.05; (2) then cooling the steel sheet to a temperature range below 700° C. in an atmosphere having oxidation potential P(HO)/P(H) equal to or lower than 0.05; and (3) reheating the steel sheet to a temperature in the range of 800° C. to 900° C. and retaining the steel sheet at the temperature for soaking in an atmosphere having oxidation potential P(HO)/P(H) equal to or higher than 0.3.