THE MANUFACTURING METHOD OF HIGHMAGNETIC FLUX DENSITY ORIENTED ELECTRIC STEEL SHEET OF SLAB LOW TEMPERATURE HEATING

摘要

PURPOSE: A method for manufacturing oriented electrical steel sheets having high magnetic induction is provided to improve productivity of slab manufacturing by controlling temperature condition. CONSTITUTION: The oriented electrical steel sheet is manufactured by heating silicon steel slab comprising C 0.025-0.08wt.%, Si 2.5-4.5wt.%, Sol-Al 0.020-0.040wt.%, N 0.0150wt.%, Mn 0.01-0.25wt.%, S 0.013-0.022, B 0.0005-0.010wt.%, a balance of Fe, and inevitable impurities in the temperature range of 1100 to 1320deg.C; hot rolling; preliminary annealing the hot rolled slab; cold rolling the slab to target thickness; decarburizing annealing; nitriding it under ammonia atmosphere in the temperature range of 600 to 800deg.C; and then high temperature annealing and coating. In the method, the amount of nitrogen solidified into the slab is 200-800ppm, and Mn/S ranges 4 to 12.