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:
Aug. 24, 1976
Filed:
Aug. 28, 1975
Katuro Kuroki, Kitakyushu, JA;
Nippon Steel Corporation, Tokyo, JA;
Abstract
Process for producing grain-oriented electric steel sheets having a remarkably improved magnetic flux density, comprising hot rolling silicon steel material containing 0.025 to 0.085% C, 2.0 to 4.0% Si, 0.010 to 0.065% acid soluble Al, continuously annealing the steel at a high temperature between 950.degree. and 1200.degree.C before a final strong cold rolling, rapidly cooling the steel to precipitate AlN, cold rolling the steel by a one-step or two-step cold rolling including a final strong cold rolling with a reduction rate range of 81 to 95% into the final thickness, coating a separating agent on the sheet after a decarburization annealing, and subjecting the sheet to a final annealing to obtain a grain-oriented electric steel sheet having excellent excitation characteristics and B.sub.8 characteristics of at least more than 1.90 Wb/m.sup.2, said separating agent containing 0.1 to 15% of antimony or an antimony-containing compound.