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. 26, 2002
Filed:
Dec. 09, 1999
Applicant:
Inventors:
Stefano Cicale′, Rome, IT;
Stefano Fortunati, Ardea, IT;
Giuseppe Abbruzzese, Montecastrilli, IT;
Assignee:
Acciai Speciali Terni S.p.A., Terni, IT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01F 1/04 ; C21D 8/12 ;
U.S. Cl.
CPC ...
H01F 1/04 ; C21D 8/12 ;
Abstract
In the production of grain-oriented electrical steel strip, the grain growth inhibition is controlled by balancing the copper, aluminum and carbonium content in order to control the type and quantity of precipitated second phases and obtain optimum grain dimensions during the decarburization annealing. This is done by using a continuous high-temperature thermal treatment in which nitrogen is diffused into the steel strip and aluminum is directly precipitated as aluminum nitride which controls the grain orientation of the final product.