Abstract: The in-line measurement on no-load magnetic field of mold electromagnetic stirrer for 350 mm x 470 mm bloom casting has been carried out to get distribution rule of magnetic induction in mold. Based on magnetic field measured results the electromagnetic force at solidifying front and liquid rotational velocity are calculated and the effect of electromagnetic stirring parameters on liquid rotational velocity is analyzed to define the range of stirring current and frequency. The results of commercial casting of steel 42CrMo show that as mold stirring current is 150 A with frequency 2. 5 Hz, the maximum deviation of carbon content at cross section of bloom is ±0. 01%, the macro-segregation band of bloom is basically e- laminated and the internal quality of bloom improves obviously.

摘要： 对350 mm×470 mm大方坯结晶器电磁搅拌的空载磁场进行了在线测量,获得了结晶器内磁感应强度分布规律。根据磁场测量结果计算了凝固前沿的电磁力及钢水流动速度,并分析了电磁搅拌参数对钢水流动速度的影响,确定了搅拌电流和频率的范围。由42CrMo钢现场实验的结果得出,当结晶器电磁搅拌电流为150 A,频率为2.5 Hz时,铸坯横断面的最大碳含量的偏差为±0.01%,带状偏析基本消除,铸坯内部质量明显改进。