1 500 mm x230 mm板坯结晶器液面波动与卷渣行为水力学模型试验和应用

基于相似理论，以钢厂1 500 mmx230 mm板坯结晶器为原型建立1 ：2的结晶器水力学模型。结果 表明，吹气量一定时，水口中心处到窄边的液面波动先增大后减小,吹气量大于0. 8 lymin时,开始发生卷渣现象， 并且结晶器内的气泡数量变多。浸人深度的增加使液面波动减弱，浸入深度在65 - 95 mm时对卷渣影响的效果不 显著;拉速增加使流股的冲击深度增大，拉速大于LI m/min时有大渣滴被卷入;当结晶器的拉速为1.0 ~ 1.1 m/min, 吹气量为0.6~0.8 I/min,浸入深度为75 - 85 mm时较合理。C45E钢生产实践表明，当拉速由0.9-1.2 m/min调整 至1.0 ~ 1.1 m/min,浸入深度由130 ~ 190 mm改进为150 ~ 170 mm时,铸坯缺陷率由6%降至1.9%。

Water Hydraulic Model Test on Liquid Level Fluctuation and Slag Entrapment Behavior of 1 500 mm x 230 mm Slab Mold and Application

1 ： 2 water hydraulic model is established based on similar theory for a 1 500 mm x 230 mm slab mold as a prototype at a steelworks. The results show that when the blowing gas flowrate is certain, the fluctuation of die liquid level from the center of the nozzle to the narrow side first increases and then decreases, and when the blowing gas flowrate is more than 0. 8 L/min, the phenomenon of slag entrapment begins to occur and the number of bubbles in the mold becomes more. The increase of immersion depth makes the liquid level fluctuation weaker, and the effect of immersion depth in the range of 65 ~ 95 mm on the effect of slag entrapment is not significant. Increasing casting speed increases the impact depth of the flow strand, with large slag droplets being involved at casting speeds more than 1. 1 m/min. When the casting speed of the mold is 1.0 ~ 1.1 m/min, the blowing gas flowrate is 0. 6 ~0. 8 L/min, and the immersion depth is 75 ~ 85 mm is more reasonable. The production practice of C45E steel shows that as the drawing speed is adjusted from 0. 9 ~ 1.2 m/min to 1.0 ~ 1. 1 m/min and the immersion depth is improved from 130 ~ 190 mm to 150 ~ 170 mm, the billet defect rate is reduced from 6% to 1.9%.