| 摘要 |
PURPOSE: A method for manufacturing flat rolled magnetic steel sheets and strip is provided which improves productivity and reduces production costs by increasing rolling productivity and enabling heat treatment under the non-vacuum atmosphere. CONSTITUTION: In manufacturing ultra-thin silicon flat rolled magnetic steel sheets and strip having a thickness of 0.23 mm or less by passing a hot rolled silicon steel sheet manufactured by melting and hot rolling through processes of first cold rolling, first intermediate annealing, second cold rolling and recrystallization annealing under the dry hydrogen atmosphere, the method for manufacturing an ultra-thin oriented silicon steel sheet having low watt loss and high magnetization properties is characterized in that a rolling ratio of the second cold rolling is 30 to 80%, and an atmospheric temperature of the recrystallization annealing under the dry hydrogen atmosphere is ranging from 850 to 1350 deg.C, wherein the hot rolled silicon steel sheet comprises 4 wt.% or less of Si, 0.01 wt.% or less of C, 0.01 wt.% or less of N, 0.05 wt.% or less of S, 0.01 wt.% or less of sol.Al and a balance of Fe and other inevitable impurities, and wherein the dry hydrogen atmosphere has a partial pressure of vapor for hydrogen (PH2O/PH2) which is less than 10¬-3.
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