| 摘要 |
PURPOSE: A method for manufacturing oriented electrical steel sheets having superior magnetic properties even in the thickness of over 0.35mm is provided for the iron core applications of electric appliances. CONSTITUTION: The oriented electrical steel sheet is manufactured by heating a slab comprising Si 2.9-3.5wt.%, Mn 0.1-0.3wt.%, S 0.005-0.015wt.%, Sol-Al 0.01-0.022wt.%, N 0.006-0.012wt.%, a balance of Fe, and inevitable impurities at 1300deg.C or lower; hot rolling the slab; preliminary annealing in the temperature range of 950 to 1100deg.C for 1-20min followed by pickling; cold rolling the slab to 0.4-0.6mm in thickness; decarburizing annealing the slab under 750-850deg.C of wet atmosphere of hydrogen and nitrogen gas for about 100min; annealing the slab at high temperature and then coating.
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