| 摘要 |
PURPOSE: A method is provided to stably produce an oriented electric steel plate without loosing a benefit of a low slab heating and with a reduced process than an existing technique at the same time. CONSTITUTION: A cold rolled plate is produced by heating, hot-rolling, a cold-rolling and preliminarily annealing a silicon steel slab. A separating agent of annealing is spread after decarbonization-annealing the cold rolled plate. An oriented electric steel plate is produced by an annealing of high temperature. The silicon steel slab is composed of C of 0.03-0.08wt%, Si of 2.90-3.30wt%, Mn of 0.05-0.30wt%, S under 0.007wt%, a soluble Al of 0.010-0.040wt%, N of 0.03-0.010wt%, P of 0.01-0.04wt%, Cr of 0.05-0.20wt%, Fe and other impurities. A heating temperature of the silicon steel slab is at 1100-1250°C. The preliminary annealing process is performed through heat treating cycle to crack for 5seconds-1minute at first to solidify a coarsening nitrated extract formed at the hot rolling, to cool to 700-800°C to re-extract and to control the extract in an appropriate size and to cool to a normal temperature.
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