连铸工艺参数对板坯凝固终点的影响

以Q235钢为试验对象，利用射钉法在铸坯1/4位置处测量出230 mm×1 510 mm断面在1.05 m/min拉速下的坯壳厚度，以此为基础，优化凝固计算模型，确定液相穴长度及凝固终点，并验证了铸机预报结果；通过计算结果分析连铸拉速、浇铸过热度及二冷比水量等工艺参数对连铸板坯的凝固终点位置的影响，得到了液芯长度与拉速、比水量等工艺参数之间的拟合关系，从而获得铸坯的凝固规律，为铸坯凝固末端轻压下及电磁搅拌技术的应用提供了有效的依据。

Effect of continuous casting technological parameters on solidification end point of slab

The solidified shell thickness of Q235B slab with cross section of 230 mm×1 510 mm was measured by the nail-shooting test at the speeds of 1.05 m/min in order to determine the length of the liquid phase and the solidification end point and verify the prediction results of the casting machine. Based on the measured data of solidified shell thickness during continuous casting and the calculated results of optimized solidification calculation model， the influences of technological parameters such as casting speed， superheat and specific water flow on the solidification end point position of continuous casting slab were analyzed so that the fitting relationship between solidification end point and technological parameters were obtained， thus providing the solidification state of slab. The research results provide a good foundation to apply soft reduction technique and electromagnetic stirring technology at the solidification end.