| 摘要 |
PURPOSE: A method for manufacturing oriented electrical steel sheet using hot rolled thin coil is provided to improve rolling productivity and remove surface oxides layer easily by making hot rolled steel sheet thin and decarburizing final cold rolled steel sheet properly. CONSTITUTION: The oriented electrical steel sheet using hot rolled thin coil is manufactured by reheating a steel slab comprising Si 2.8-3.2wt.%, C 0.025-0.050wt.%, P 0.015wt.% or less, sol-Al 0.008-0.025wt.%, N 0.007-0.011wt.%, S 0.008wt.% or less, Mn 0.1-0.3wt.%, Cu 0.6wt.% or less, a balance of Fe, and other inevitable impurities; hot rolling the steel slab to 1.5-2.5mm; annealing the hot rolled steel sheet in the temperature range of 800 to 950deg.C for 1-2min; pickling; cold rolling it to 0.27-0.35mm; decarburization-annealing the cold rolled steel sheet under wet atmospheric condition of 830-900deg.C for 2-3min; applying a fusion preventing agent; and then final annealing at a high temperature.
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