C70DA钢小方坯末端电磁搅拌工艺的优化  

Optimization of F-EMS parameters in C70DA steel billet casting

作　　者：马建超[1] 周青峰[1] 苏笃星 曹斌[2] 金红军[2] 冯健[2] 

机构地区：[1]江苏沙钢集团有限公司江苏省沙钢钢铁研究院,江苏苏州215625 [2]江苏沙钢集团有限公司润忠炼钢厂江苏苏州215625

出　　处：《炼钢》2012年第6期15-17,28,共4页Steelmaking

摘　　要：针对末端电磁搅拌器在高碳钢C70DA小方坯连铸生产中存在的铸坯中心缺陷问题,分别采用射钉试验和CT3型特斯拉计对电磁搅拌位置处液芯厚度以及搅拌器内磁感应强度进行了调查分析。结果表明:C70DA钢小方坯实际生产过程中电磁搅拌位置液芯厚度较大和电磁搅拌力不足是造成高碳钢小方坯中心偏析和中心疏松严重的主要原因。通过增加二冷比水量至1.73 L/kg,优化末端电磁搅拌参数为频率11 Hz、电流500 A,可以将电磁搅拌位置处液芯由60 mm减少至54 mm,电磁搅拌力也达到最大值,C70DA钢小方坯中心偏析和中心疏松显著减轻,中心质量得到了改善。Liquid core and magnetic induction in high carbon steel C70DA billet with F- EMS were investigated by using rivet shooting and Tesla meter CT3. The results indica- ted that wider liquid core and insufficient stirring force are the main causes for heavy center segregation and porosity. The casting and F-EMS parameters were therefore op- timized by increasing specific secondary cooling water from 1.51 to 1.73 L/kg and ad- justing F-EMS frequency and current to llHz and 500 A. Correspondingly, the thick- ness of liquid core at F-EMS has been decreased from 60 mm to 54 mm, and the maxi- mum stirring force achieved. With the optimized parameters, center segregation and rosity are alleviated greatly in the C70DA steel billets.

关 键 词：高碳钢 末端电磁搅拌 磁感应强度 中心缺陷 

分 类 号：TF777.3[冶金工程—钢铁冶金]