| 摘要 |
PURPOSE: A method of manufacturing grain oriented electrical steel having low noise and magnetic flux, and a heating treatment apparatus used therefor are provided. CONSTITUTION: In a method of manufacturing a grain oriented electrical steel where a steel slab comprising Si 0.4 to 4.8 wt.%, C 0.02 to 0.07 wt.%, Mn 0.05 to 0.2 wt.%, S 0.02 to 0.03 wt.%, Cu 0.05 to 0.3 wt.%, Ce, a balance of Fe and incidental impurities is subject to reheating at 1250 to 1400 deg.C, hot rolling, annealing, pickling, two times cold rolling including process annealing, decarburization annealing, final hot annealing and tension coating, the method is characterized in that Ce is added in the steel slab in an amount of 0.006 to 0.09 wt.%; the steel sheet after final hot annealing is magnetic heat-treated at 300 to 600°C for more than 10 sec, wherein the magnetic heat treatment is conducted at 400 to 550 deg.C for more than 2 min under direct current saturation magnetic field. The apparatus used for the manufacture of grain oriented electrical steel comprises a furnace(4) for heating a specimen(1); a solenoid(5) which is installed inside the furnace with spaced apart from the inner surface of the furnace in a fixed distance to excite the specimen; a steel strip(6) which is connected to both ends of a specimen and forms a closed circuit passing through the solenoid; and a power supply to impress voltage to the solenoid.
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