中间包结构优化及冶金效果

The Structural Optimization of Tundish and Metallurgical Effect

通过水模型实验,对四流圆坯中间包三种挡墙形式下的包内流场进行模拟研究。结果表明:原挡墙控流下的中间包同一侧两流之间的流体流动特性存在很大差异,与内侧相比,外侧流的最小停留时间、峰值时间长、死区体积大,造成中间包内钢液温度不均匀,夹杂物不能有效地上浮去除。U型挡墙能很好地解决各流间的同步性,但是最小停留时间短,死区比例较大。采用Y型挡墙可以有效地改变中间包内流场分布,促进夹杂物上浮,提高钢水清洁度,为三种挡墙形式之最优。工业试验表明,Y型挡墙在降低铸坯总氧和夹杂物方面均优于原挡墙。

The flow field of four-strand tundish of round billet under three different weirs has been studied by water model experiments. The results show that a big difference in fluid flow characteristics exists between the two outlets at the same side of the tundish controlled by the original weir. Compared with the inside outlet, the outside outlet has longer minimum residence time and peak concentration time and larger dead zone volume. So the original weir can not meet the technical requirements for inclusion floatation and temperature homogenization. U-shape weir can satisfactorily settle the flow synchronism between outlets, but has short minimum residence time and large dead zone volume. Y-shape weir is the optimal shape of the three, which can change the fluid flow of the tundish efficiently and improve inclusion removal and raise steel cleanliness. The industrial test shows that Y-shape weir is better than the original one in reducing total oxygen and inclusions of billets.