Grain-oriented electrical steel sheet
An electromagnetic steel plate and orientation technology, applied in the direction of circuits, magnetic objects, magnetic materials, etc., to achieve the effects of reducing iron loss, optimizing heating speed, and optimizing holding time
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Embodiment 1
[0095] Manufactured by continuous casting, containing C: 0.051%, Si: 3.45%, Mn: 0.16%, Al: 22ppm, N: 13ppm, S: 16ppm, Se: 20ppm and P: 0.09%, and the balance consists of Fe and The steel slab composed of unavoidable impurities was heated by soaking at 1200° C. for 80 minutes, and then finished by hot rolling to a thickness of 2.2 mm. Then, hot-rolled sheet annealing was performed at 1000° C. for 20 seconds in a dry nitrogen atmosphere. Next, after finishing to a plate thickness of 0.23 mm by cold rolling, the 2 -48%N 2 , Perform primary recrystallization annealing at 840°C for 70 seconds at 840°C for 70 seconds in a humid atmosphere with a dew point of 60°C. Furthermore, secondary recrystallization annealing by holding in a hydrogen atmosphere at 1225° C. was performed after applying an annealing separator mainly composed of MgO. At this time, the heating rate of the secondary recrystallization annealing and the holding time at 1225° C. were varied within various ranges sho...
Embodiment 2
[0101] A slab containing the components shown in Table 2, with the balance being Fe and unavoidable impurities was produced by continuous casting, heated at 1150° C. for 35 minutes, and then finished to a thickness of 1.8 mm by hot rolling. Then, hot-rolled sheet annealing was performed at 1100° C. for 20 seconds in a dry nitrogen atmosphere. Next, after cold-rolling finishing to a plate thickness of 0.23 mm, in 38% H 2 -62%N 2 , In a humid atmosphere with a dew point of 48°C, primary recrystallization annealing at 825°C for 170 seconds, which also serves as decarburization, was performed. Furthermore, secondary recrystallization annealing was performed by holding an annealing separator mainly composed of MgO at 1200° C. for 10 hours in a hydrogen atmosphere. The temperature increase rate of the secondary recrystallization annealing was set at 20° C. / hour.
[0102] The high-frequency iron loss W of the product plate obtained by the method described in JIS C 2550 10 / 200 (Ir...
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