Oriented electrical steel sheet and manufacturing method therefor
A technology of grain-oriented electrical steel sheet and manufacturing method, which can be applied in the direction of manufacturing tools, circuits, electrical components, etc., can solve problems such as deterioration of iron loss characteristics, and achieve the effects of improving magnetic properties and productivity, shortening purification annealing time, and improving productivity.
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Embodiment 1
[0103] In % by weight, the slab contains Si: 3.17%, C: 0.0055%, Al: 0.0025%, and Ba, Y, Sn, Sb, Ni as shown in Table 1, and the balance contains Fe and unavoidable impurities. The slab is heated at a temperature of 1150°C for 90 minutes, then hot-rolled, and rapidly cooled to 580°C for annealing at 580°C for 1 hour, and then hot-rolled after furnace cooling to produce a hot-rolled sheet with a thickness of 2.6mm . This hot-rolled sheet was heated at a temperature of 1090° C., then kept at 910° C. for 90 seconds, cooled in boiling water, and pickled. Next, it was cold-rolled to a thickness of 0.27 mm. After the cold-rolled steel plate is heated up in the furnace, it is kept at a temperature of 800°C to 900°C for 150 seconds in a mixed gas environment with a dew point temperature of 64°C formed by feeding 50% by volume of hydrogen and 50% by volume of nitrogen at the same time. , so that the decarburized carbon content is less than or equal to 0.003% by weight.
[0104] After...
Embodiment 2
[0109] Carry out the process up to cold rolling identical with embodiment 1 to the sample that contains No. 10, 16, 18 and No. 39 identical compositions of embodiment 1, and after the steel plate after cold rolling is heated up in furnace, pass through simultaneously Add 50% by volume of hydrogen and 50% by volume of nitrogen to form a mixed gas environment with a dew point temperature of 60°C and keep it at a temperature of 800°C to 900°C for 120 seconds, and reduce carbon to less than or equal to 0.003 wt. %. After the sample was coated with the annealing separator MgO, the final annealing was carried out in the coil state. For final annealing, up to 1200°C, the heating environment is a 100% hydrogen environment by volume, and when the temperature reaches 1200°C, it is kept in a 100% hydrogen environment for 20 hours, and then furnace cooled. The magnetic properties measured under each condition are shown in Table 2 below.
[0110] 【Table 2】
[0111]
[0112] In Table ...
Embodiment 3
[0114] In % by weight, the slab contains Si: 3.15%, C: 0.05%, and Mn, S, Ba, Y, Sn, Sb shown in Table 3 below, and the balance contains Fe and unavoidable impurities. Heated at 1150°C for 90 minutes, then hot-rolled, and rapidly cooled to 580°C, annealed at 580°C for 1 hour, and then hot-rolled after furnace cooling to produce a hot-rolled sheet with a thickness of 2.6mm. This hot-rolled sheet was heated at a temperature of 1050° C. or higher, then kept at 910° C. for 90 seconds, cooled in boiling water, and pickled. Next, it was cold-rolled to a thickness of 0.262 mm. After the cold-rolled steel plate is heated up in the furnace, it is kept at a temperature of 800°C to 900°C for 120 seconds in a mixed gas environment with a dew point temperature of 60°C formed by feeding 50% by volume of hydrogen and 50% by volume of nitrogen at the same time. , so that the decarburized carbon content is less than or equal to 0.003% by weight.
[0115] After the annealing separator MgO is c...
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