Grain-oriented electrical steel sheet and manufacturing method therefor
A technology of grain-oriented electrical steel sheet and manufacturing method, applied in manufacturing tools, furnaces, heat treatment equipment, etc., can solve problems such as deterioration of iron loss characteristics, and achieve the effects of excellent magnetic properties, excellent magnetic flux density and iron loss characteristics
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Embodiment 1
[0102] Prepare a slab, which contains Si: 3.15%, C: 0.053%, Y: 0.08%, Mn: 0.1%, S: 0.0045%, N: 0.0028%, and Al: 0.008%, in weight % The amount consists of Fe and unavoidable impurities.
[0103] The slab was heated at a temperature of 1150° C. for 90 minutes and then hot-rolled to produce a hot-rolled sheet having a thickness of 2.6 mm. The hot-rolled sheet was heated to a temperature of 1050°C or higher, then kept at 930°C for 90 seconds, cooled with water, and pickled. Next, it was cold-rolled to a thickness of 0.30 mm using a reverse rolling mill. The cold-rolled steel plate is heated to the soaking temperature at a rate of 50°C / s in the heating step of hydrogen: 50% by volume and nitrogen: 50% by volume in a mixed gas environment, and the partial pressure of oxygen (P H2O / P H2 ) and soaking temperature conditions for 120 seconds to perform primary recrystallization annealing, so that the carbon content in the steel plate is less than or equal to 0.003% by weight.
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Embodiment 2
[0112] Prepare a slab comprising Si: 3.35%, C: 0.058%, Y: 0.12%, Mn: 0.06%, S: 0.0030%, N: 0.0030%, Al: 0.005%, P : 0.015%, Cu: 0.02%, and Cr: 0.03%, and the balance is composed of Fe and unavoidable impurities.
[0113]The slab was heated at a temperature of 1150° C. for 90 minutes and then hot-rolled to produce a hot-rolled sheet having a thickness of 2.3 mm. The hot-rolled sheet was heated to a temperature of 1050°C or higher, then kept at 910°C for 90 seconds, cooled with water, and pickled. Next, it was cold-rolled to a thickness of 0.23 mm using a reverse rolling mill. The cold-rolled steel plate is heated to the soaking temperature at a rate of 50°C / s in the heating step under the mixed gas environment of hydrogen: 50% by volume and nitrogen: 50% by volume, and the partial pressure of oxygen (P H2O / P H2 ) and soaking temperature conditions and maintained at a soaking temperature of 850° C. for 120 seconds to perform primary recrystallization annealing.
[0114] The...
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