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:
Mar. 10, 1981
Filed:
Dec. 12, 1979
Applicant:
Inventors:
Assignee:
Kawasaki Steel Corporation, Kobe, JP;
Primary Examiner:
Int. Cl.
CPC ...
C23F / ; H01F / ;
U.S. Cl.
CPC ...
148113 ; 148-62 ; 148-616 ; 427104 ;
Abstract
A grain-oriented silicon steel sheet having substantially no glass film can be obtained by subjecting a cold rolled silicon steel sheet having a final gauge to a decarburization annealing to form subscale on the steel sheet surface, applying an annealing separator consisting of hydrated silicate mineral fine powder, a strontium- or barium-containing compound, calcium oxide or calcium hydroxide and the remainder being Al.sub.2 O.sub.3, and finally annealing the above treated steel sheet. The steel sheet has excellent punchability when the steel sheet is coated with a phosphate system or chromate-organic resin mixture system insulating coating.