大方坯末端电磁搅拌工艺参数优化  

Optimization of F-EMS parameters of bloom continuous casting

作　　者：葛亮[1] 曾亚南[1] 汪成义[1] 张西超[1] 孙彦辉[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《炼钢》2015年第1期61-64,77,共5页Steelmaking

基　　金：国家自然科学基金资助项目(51274032)

摘　　要：结合某厂大方坯连铸机的实际情况，采用ProCAST软件建立了数学传热模型，并利用射钉结果对模型加以修正，提高了模型的准确性。根据大方坯模拟结果，末端电磁搅拌位置设在凝固率为0．6～0．7或者液芯35-55mm处效果不佳，研究铸坯凝固规律，选择装在中心固相率为0．1处，这与3／4液相穴位置相对应。根据固相率为0．1的概念，得出过热度28℃，比水量0．6L／kg条件下，拉速0．78m／min偏大，推荐拉速0．7m／mim，并计算了最佳拉速随现场过热度的变化。优化后铸坯内部质量明显改善。Combining with the actual situation of the bloom caster in the plant, a heat- transfer mathematical model was established with the help of ProCAST software. The model was modified on the basis of nail-shooting results to improve its accuracy. According to the simulation results, the principles of the installation position of F-EMS such as the position where the solidification rate was 0.6 - 0. 7 or at pool thickness of 35 -55 mm didn＇t apply in this case. When studying the characteristics of solidification, the central solid fraction of the boom nearby 0. 1 maybe a good position for F-EMS, which also corresponds to another rule. to install at three quarters of the length of liquid core. Under these rules, current casting speed 0. 78 m/min is a little faster when superheat is 28 ~C and water ratio is 0. 6 L/kg, and the optimum casting speed is 0. 70 m/min. In the process of actual casting, the superheat of hot steel is always changing, so the study also calculated the relationship between casting speed and superheat. Base on the findings, industrial plant trial was conducted and the results showed that the problem of inner composition segregation improved significantly.

关 键 词：大方坯 连铸 末端电磁搅拌 固相率 ProCAST模拟 

分 类 号：TF777.2[冶金工程—钢铁冶金]