Process for the production of grain-oriented magnetic sheet starting from thin slab
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United States of America Patent
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Oct 28, 2014
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Nov 18, 2009
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Nov 18, 2008
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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.
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