Method for annealing grain-oriented electromagnetic steel sheet and method for producing grain-oriented electromagnetic steel sheet
An electromagnetic steel plate, directional technology, applied in manufacturing tools, inorganic material magnetism, furnace and other directions, can solve problems such as poor adhesion, adverse effects of forsterite film, difficult film characteristics, etc.
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Embodiment 1
[0200] A grain-oriented electrical steel sheet excellent in the properties of the forsterite-based coating and the magnetic properties was produced by the following method.
[0201] A steel slab of the following composition was produced by continuous casting: C: 0.20% by mass, Si: 3.35% by mass, Mn: 0.050% by mass, and Sb: 380 mass ppm, and Al: 320 mass ppm and N: 80 ppm by mass, and the balance is composed of iron and unavoidable impurities. After heating this steel slab to 1200°C, it was hot-rolled into a hot-rolled sheet having a thickness of 2.0 mm, and hot-rolled sheet annealing was performed at 1050°C for 60 seconds. Next, a cold-rolled sheet having a thickness of 0.03 mm was obtained by cold rolling, and recrystallization annealing was performed at 900° C. for 10 seconds in a dry atmosphere with a dew point of −45° C.
[0202] After the recrystallization annealing, the first batch annealing is performed. The annealing separator as shown in Table 5 was applied before o...
experiment example 2
[0222] A grain-oriented electrical steel sheet excellent in the properties of the forsterite coating and the magnetic properties was produced by the following method.
[0223]Using the continuous casting method, it is manufactured to contain C: 0.019 mass %, Si: 3.28 mass %, Mn: 0.073 mass % and Sb: 330 mass ppm, respectively controlled to Al: 38 mass ppm, N: 30 mass ppm, S: 18 Mass ppm, Se: less than 10 mass ppm (less than the analytical limit value), steel slabs containing no inhibitor-forming components. The balance here consists of iron and unavoidable impurities. After heating this steel slab to 1200 degreeC, it was made into the hot-rolled plate of 2.0 mm by hot rolling, and the hot-rolled plate annealing was performed at 1050 degreeC for 60 seconds.
[0224] Next, a cold-rolled sheet having a thickness of 0.30 mm was obtained by cold rolling, and recrystallization annealing was performed at 900° C. for 10 seconds in a dry atmosphere with a dew point of −45° C.
[0225...
Embodiment 3
[0238] A grain-oriented electrical steel sheet without a forsterite coating and excellent in magnetic properties and workability was manufactured by the following method.
[0239] Produced by continuous casting method containing C: 0.020 mass %, Si: 3.31 mass %, Mn: 0.060 mass % and Sb: 450 mass ppm, and contains Al: 300 mass ppm and N: 70 mass ppm as inhibitor components, A steel slab with the balance consisting of iron and unavoidable impurities. This steel slab was heated to 1200° C., then hot-rolled to form a hot-rolled sheet having a thickness of 1.8 mm, and annealed at 950° C. for 60 seconds. Next, a cold-rolled sheet having a thickness of 0.27 mm was obtained by cold rolling, and recrystallization annealing was performed at 880° C. for 10 seconds in a dry atmosphere with a dew point of −45° C., and then final annealing was performed.
[0240] An annealing separator as shown in Table 10 was applied before or after recrystallization. Coating was performed using a roll c...
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