Grain-oriented electrical steel sheet and method for producing same
A technology of oriented electrical steel sheet and manufacturing method, applied in the direction of manufacturing tools, circuits, electrical components, etc., can solve the problems of low bonding force, poor adhesion between the steel sheet and the insulating coating, and the insulating coating cannot be formed uniformly, so as to reduce the Iron loss, effect of preventing thermal bonding
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experiment example 1
[0113] Experimental Example 1 - Comparison Based on Residual Oxide Skin Layer
Embodiment 1
[0114] Example 1 - The case where the scale layer remains
[0115] A slab was prepared which contained 3.4% by weight of silicon (Si) and the balance consisted of Fe and other unavoidable impurities.
[0116] The slab was hot-rolled to a thickness of 2.3 mm to manufacture a hot-rolled sheet.
[0117] Shot blasting machine (Shot Blaster) is used to process the hot-rolled plate. The moving speed of the steel plate is 30mpm, the amount of particles used is 700kg / min, the size of the shot (ball) is 0.6cm, and the rotating speed is 2250rpm, so that the oxide scale layer is about 50nm thickness remains. Then, the hot-rolled sheet is passed between scrapers coated with rubber having an elasticity of about 1 to 2, and the surface roughness is controlled to be about 2.0 to 2.3. Subsequently, after dipping for about 120 seconds in a hydrochloric acid solution (concentration: about 16% by weight) at a temperature of about 72° C. for about 120 seconds, washing was performed.
[0118] ...
Embodiment 2
[0135] Example 2 - Using 1 part by weight of ammonium fluoride and raising the temperature to 1000°C for the second time
[0136] A metal oxide layer was formed on the cold-rolled sheet of Example 1 by the following procedure.
[0137] To the cold-rolled sheet of embodiment 1 in ammonia (NH 3 ) environment and a temperature of 850 ° C for a recrystallization annealing.
[0138] An annealing separator comprising magnesium hydroxide and ammonium fluoride is coated on the cold-rolled sheet after one recrystallization annealing. Ammonium fluoride contains 1 part by weight with respect to 100 parts by weight of magnesium hydroxide. Water contains 85 parts by weight with respect to 100 parts by weight of magnesium hydroxide.
[0139] Next, secondary recrystallization annealing is performed on the cold-rolled sheet coated with the annealing separator. During secondary recrystallization annealing, the first temperature rise is from 650°C to 850°C at a rate of 15°C / hr, and the seco...
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