150 mm×150 mm小方坯结晶器内流场及凝固行为模拟  

Simulation on flow and initial solidification behavior in a 150 mm× 150 mm billet mold

作　　者：贾进 高飞 罗霄 邹铭 周文浩[1] 张华[2] 方庆 JIA Jin;GAO Fei;LUO Xiao;ZOU Ming;ZHOU Wenhao;ZHANG Hua;FANG Qing(Technology and Quality Control Department,Hunan Valin Xiangtan Iron and Steel Co.,Ltd.,Xiangtan 41l101,Hunan,China;Key Laboratory of Iron and Steel Metallurgy and Resource Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hunan,China)

机构地区：[1]湖南华菱湘潭钢铁有限公司科技质量部,湖南湘潭411101 [2]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081

出　　处：《连铸》2024年第2期56-63,共8页Continuous Casting

基　　金：国家自然科学基金资助项目(52004191);中国博士后科学基金资助项目(2022M711120);湖北省教育厅科学技术研究资助项目(B2022020)。

摘　　要：结晶器是整个连铸过程的核心环节,其内钢液流动、传热及初始凝固行为直接影响着铸坯质量,而拉速和过热度等工艺条件是影响结晶器冶金行为的关键参数。以某厂150 mm×150 mm小方坯结晶器为研究对象,建立耦合数学模型,分析过热度及拉速对结晶器内钢液流动与传热行为的影响。结果表明,当拉速由2.4 m/min增至3.0 m/min时,结晶器出口处铸坯角部温度与面部温度分别由960 K、1 050 K增至1 040 K、1 200 K;结晶器出口处坯壳厚度由11.21 mm降至8.71 mm,计算域出口处坯壳由16 mm降至14 mm;当过热度由15 K增至35 K时,铸坯表面和中心温度相应升高,幅度大致为5~10 K,结晶器出口坯壳厚度由10.45 mm降至9.01 mm,计算域出口处坯壳厚度由15 mm降至13 mm。研究结果可为冷镦钢小方坯连铸结晶器制定合理的工艺参数提供理论指导。As the core link of the whole continuous steel casting process,the flow,heat transfer and initial solidification behavior of molten isteel in the continuous steel casting mold directly affect the quality of the billet,and the process conditions such as casting speed and superheat are the key parameters affecting the metallurgical behavior of the continuous steel casting mold.A 150 mm ×150 mm continuous casting billet mold in a factory is taken as the research object,and a coupled mathematical model is established to analyze the influence of superheat and casting speed on the flow and heat transfer behavior of molten steel in the mold.The results showed that when the casting speed increases from 2.4 m/min to 3.0 m/min,the surface temperature and corner temperature are slightly enhanced by about lo K,the center temperature is slightly increased by about 1 K,the shell thickness at mold outlet is decreased from 11.21 mm to 8.71 mm,and decreased from 16 mm to 14 mm at computational outlet.When the superheat increases from 15 K to 35 K,the surface and center temperatures of the slab increase by about 5-10 K,the shell thickness at the mold outlet decreases from 10.45 mm to 9.01 mm,and decreased from 15 mm to 13 mm at computational outlet.The research outcomes can provide theoretical guidance for the formulation of reasonable process parameters of cold heading steel billet continuous casting mold.

关 键 词：结晶器 流场 初始凝固 拉速 过热度 

分 类 号：TF777[冶金工程—钢铁冶金]