摘要
为研究现有工况下230mm厚度板坯连铸结晶器内的流场特性,并探究板坯表面小纵裂的产生原因,本文建立了1∶1结晶器物理模型,系统分析了浸入式水口结构、拉坯速度及插入深度等工艺参数对结晶器流场和液面波动行为的影响。研究结果表明,浸入式水口尺寸对结晶器流场具有显著影响:侧孔及内腔尺寸增大可降低出口流股的动能,减弱上回流区流速,并有效抑制液面波动。液面波动过大被确定为导致板坯裂纹的主要因素。综合流场分析结果,确定适用于当前工况的浸入式水口最优结构参数为:侧孔尺寸66mm×90mm,内腔直径80mm。
To investigate the flow behavior in the mold during continuous casting of 230 mm thick slabs under current operating conditions and to identify the causes of minor longitudinal surface cracks,a full-scale physical model of the mold was developed.This study systematically examined the effects of key process parameters—including submerged entry nozzle(SEN)geometry,casting speed,and immersion depth—on the fluid flow and meniscus fluctuation within the mold.The results demonstrate that SEN dimensions significantly influence the flow pattern:increasing both the port size and the inner bore diameter reduces the kinetic energy of the exiting jet,decreases the velocity of the upper recirculation zone,and effectively suppresses level fluctuations.Excessive meniscus fluctuation was identified as the primary factor leading to slab cracking.Based on comprehensive flow field analysis,the optimal SEN configuration for current operational conditions was determined to feature ports sized 66 mm×90 mm and an inner bore diameter of 80 mm.
作者
任涛
王迪
董长征
张海波
温希望
候平军
REN Tao;WANG Di;DONG Changzheng;ZHANG Haibo;WEN Xiwang;HOU Pingjun(Rizhao Steel Holding Group Co.,Ltd.,Rizhao 276800,Shandong,China)
出处
《连铸》
北大核心
2025年第5期183-194,共12页
Continuous Casting
关键词
结晶器流场
230mm厚度
浸入式水口
纵裂
卷渣
保护渣
mold flow field
230 mm thickness
submerged entry nozzle
longitudinal crack
slag entrapment
slag
