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用Pb-Sn-Bi低熔点合金进行了热模拟实验,研究了在静磁场作用下板坯连铸结晶器内的液面波动行为。实验结果表明可应用静磁场控制结晶器内金属液面的波动,且磁场对表面波动的抑制作用有一最佳值,即磁感应强度为0.5 T时液面平均波动最小。为此,为了减少由于液面波动引起的连铸板坯中的卷渣缺陷,有必要在一定的浇铸条件下优化磁感应强度。吹入氩气加剧了表面波动,且随着氩气流量的增加扰动加大。施加电磁制动能够使吹入氩气引起的液面波动受到显著的抑制。
The thermal simulation of Pb-Sn-Bi alloy with low melting point was carried out. The fluctuation of liquid surface in slab continuous casting mold under static magnetic field was studied. The experimental results show that the static magnetic field can be used to control the fluctuation of the metal surface in the mold, and the magnetic field has an optimum inhibition effect on the surface fluctuation. That is, the average liquid level fluctuation is the smallest when the magnetic induction is 0.5 T. For this reason, it is necessary to optimize the magnetic induction strength under certain casting conditions in order to reduce the roll residue defects in continuous casting slabs caused by the fluctuation of liquid level. Ar gas inflows exacerbated surface fluctuations and increased with increasing argon flow. Electromagnetic braking can be applied to make argon into the gas caused by the fluctuation of the surface is significantly inhibited.