Grain-oriented electrical steel sheet and its preparation method
A technology for oriented electrical steel sheets and hot-rolled sheets, which is applied in the field of oriented electrical steel sheets and its preparation, can solve the problems of shortening the service life of heating furnaces, fractures in the width direction, and rising production costs, and achieves uniform product characteristics and excellent magnetic properties
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[0093] A method for preparing a grain-oriented electrical steel sheet according to an embodiment of the present invention, in terms of weight percent, includes: Si: 2.0 to 4.5%, C: 0.03 to 0.09%, Al: 0.015 to 0.04%, N: less than 0.006% (except 0.006%) %), S: 0.01% or less (except 0%), Mn: 0.04 to 0.15% and the balance of Fe and other unavoidable impurities, and includes the steps of: heating the billet satisfying the following formula 1; To prepare the hot-rolled sheet; anneal the hot-rolled sheet to meet the annealing temperature (T) of the following formula 3; prepare the cold-rolled sheet by cold-rolling the hot-rolled sheet; carry out primary recrystallization annealing to the cold-rolled sheet; The recrystallization annealed electrical steel sheet is subjected to secondary recrystallization annealing.
[0094] [Formula 1]
[0095] [Mn]×[S]<0.0004
[0096] (In Formula 1, [Mn] and [S] represent the content (weight %) of Mn and S, respectively)
[0097] [Formula 3]
[00...
Embodiment 1
[0116]The steel material was melted in a vacuum and made into an ingot, followed by heating at 1200° C. for 210 minutes, followed by hot rolling to prepare a hot-rolled sheet with a thickness of 2.3 mm. Wherein, the steel includes Si: 3.23% by weight, C: 0.055% by weight, and P: 0.028% by weight, and includes Mn, S, and Al and N that change the Al / N ratio in the following table 1, and the remaining components are The balance of Fe and other unavoidable impurities.
[0117] After heat-treating the hot-rolled sheet at the temperature in Table 2 below for 30 seconds, the temperature was lowered to 50° C. and further heat-treated for 100 seconds. After that, it was quenched in water, pickled, and subjected to primary cold rolling with a thickness of 0.23 mm. The cold-rolled sheet is kept at a temperature of about 860°C for 180 seconds in an atmosphere of a wet mixture of hydrogen, nitrogen, and ammonia to perform decarburization and nitriding annealing heat treatment at the same t...
Embodiment 2
[0125] The steel material was melted in a vacuum and made into an ingot, followed by heating at 1180° C. for 210 minutes and then hot rolling to prepare a hot rolled sheet with a thickness of 2.6 mm. Wherein, the steel contains Si: 3.17% by weight, C: 0.051% by weight, and P: 0.035% by weight, and contains Mn, S, and Al and N that change the Al / N ratio in Table 3 below, and the remaining components It is the balance of Fe and other unavoidable impurities.
[0126] After heat-treating the hot-rolled sheet at the temperature in Table 4 below for 30 seconds, the temperature was lowered to 50° C. and further heat-treated for 100 seconds, then quenched in water and pickled, and then subjected to primary cold rolling with a thickness of 0.27 mm. The cold-rolled sheet was held at a temperature of about 860° C. for 180 seconds in an atmosphere of a moist mixture of hydrogen, nitrogen, and ammonia to simultaneously perform decarburization and nitriding annealing heat treatment so that ...
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