For the purpose of increasing the capacity of an Angang Strip Production (ASP) continuous caster and the surface quality of a medium-thin slab with mold sections of 150 × (1020–1540) mm², the present work investigated the influences of the submerged entry nozzle (SEN) structure and main operating parameters on the flow characteristic and temperature distribution in the mold by physical and numerical simulations. The results showed that the typical “double-roll” flow and a central jet were formed through the three-port SEN. With the original SEN, the mean wave height exceeded the critical value of 5.0 mm after the casting speed was increased due to the strong upper recirculation flow. By the slight increment of the bottom port area and the side port angle of SEN, the mean wave height was obviously decreased below 4.4 mm due to the depressing of the upper recirculation flow after the casting speed increased. Meanwhile, the temperature distribution was slightly changed by using the optimized SEN. The practical application showed that the breakout rate decreased from 0.349% to 0.107% and the surface defect rate decreased from 0.54% to 0.19% by using the optimized SEN, while throughput reached the new level of 3.96 t/min.

中文翻译：

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薄板坯连铸模具浸入式水口的优化设计

为提高鞍钢带钢连铸机产能和结晶器断面150×（1020-1540）mm ²中薄板坯表面质量, 目前的工作通过物理和数值模拟研究了浸入式喷嘴 (SEN) 结构和主要操作参数对模具中流动特性和温度分布的影响。结果表明，通过三端口 SEN 形成了典型的“双辊”流和中心射流。对于原始 SEN，由于强大的上部再循环流，在提高铸造速度后，平均波高超过了 5.0 mm 的临界值。通过SEN底部孔口面积和侧孔角的微小增加，由于提高拉速后上部回流流量的降低，平均波高明显降低到4.4mm以下。同时，通过使用优化的 SEN，温度分布略有变化。