关键词: 大方坯, 连铸, 末端电磁搅拌, 固相率, ProCAST模拟

Abstract: In combination 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 ℃ 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.

Key words: bloom, continuous casting, F-EMS, solid fraction, ProCAST simulation