Abstract
The brake effect of the freestanding adjustable combination electromagnetic brake (FAC-EMBr) and EMBr ruler on the behavior of molten steel flow and the level fluctuation were investigated with the numerical method. The effects of the horizontal magnetic pole position (EMBr ruler), magnetic induction intensity, and casting speed on two types of electromagnetic brakes were studied. The numerical simulation results show that the magnetic field caused by the EMBr ruler is mainly distributed under the submerged entry nozzle (SEN), and it is very weak nearby the meniscus area. After the FAC-EMBr is applied, the magnetic field is mainly distributed in the area below the submerged entry nozzle, the upper roll region, and in the meniscus region. The application of the electromagnetic brake can effectively suppress the impact of the jet and decrease the molten steel velocity in the meniscus area. The brake effect of the EMBr ruler on the behavior of the molten steel flow and the level fluctuation is significantly influenced by the horizontal magnetic pole position. The increasing of the magnetic flux density can significantly increase the velocity of molten steel in the upper roll region and lead to an intense fluctuation in the steel/slag interface, as the horizontal magnetic field cannot cover the three key regions. The brake effect of the FAC-EMBr is less influenced by the variation of the process parameters due to the addition of vertical magnetic poles. Additionally, the “secondary braking effect” of the vertical magnetic poles can help to lower the increase of velocity in the upper roll region caused by the excessive magnetic induction intensity and the high casting speed. Therefore, even under the high casting speed conditions, the application of a new type of FAC-EMBr is also an efficient way to suppress the molten steel flow and level fluctuation at the meniscus area and decrease the possibility of slag entrapment.
Highlights
In the slab continuous casting process, the slab quality is highly related with the melt behavior in the mold [1,2,3]
Due to the limitation of the magnetic field region, the flow control effect of the local Electromagnetic braking (EMBr) is influenced by the position of the magnetic pole, magnetic induction intensity, and submerged entry nozzle (SEN) parameters, such as the SEN immersion depth and port angle; secondly, for the EMBr ruler, the applied magnetic pole can cover the whole width of the mold and can well brake the molten steel flow of the downwards roll flow, it is difficult to brake the upper roll and stabilize the level fluctuation because of the limitation of the horizontal magnetic pole position
It can be found that the liquid slag layer near the meniscus is not washed away by the upper roll, as the casting speed is 2.2 m/min. This is mainly due to the application of the vertical magnetic pole, which effectively suppress the molten steel velocity in the upper roll region and reduces the impact strength of the upper roll flow, so that the steel/slag interface tends to be stable, and the meniscus wave height is less than that of the EMBr ruler under the same conditions
Summary
In the slab continuous casting process, the slab quality is highly related with the melt behavior in the mold [1,2,3]. Due to the limitation of the magnetic field region, the flow control effect of the local EMBr is influenced by the position of the magnetic pole, magnetic induction intensity, and SEN parameters, such as the SEN immersion depth and port angle; secondly, for the EMBr ruler, the applied magnetic pole can cover the whole width of the mold and can well brake the molten steel flow of the downwards roll flow, it is difficult to brake the upper roll and stabilize the level fluctuation because of the limitation of the horizontal magnetic pole position.
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