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:
Oct. 28, 2014
Filed:
Nov. 18, 2009
Stefano Fortunati, Rome, IT;
Giuseppe Abbruzzese, Rome, IT;
Stefano Cicale′, Rome, IT;
Centro Sviluppo Materiali S.p.A., Rome, IT;
Abstract
A process for producing grain oriented magnetic sheets by subjecting a steel slab ≦100 mm, containing 2.5-3.5% si, to the following operations: optional first heating, to a temperature T1≦1250° C.; first rough hot-rolling at T2 between 900 and 1200° C., the reduction ratio (% Rid) being at least 80% in the absence of a subsequent heating or, in the presence of a subsequent heating to T3≦1300° C., at least 60% determined by % Rid=80−(T3−T2)/5; second finishing hot-rolling at T4<1300° C. to a rolled-section thickness of 1.5 3.0 mm; cold-rolling, in one or more stages with optional intermediate annealing and with a cold reduction ratio ≧60% applied in the last stage; primary recrystallization annealing, optionally in a decarburizing atmosphere; second recrystallization annealing.