Electromagnetic torque detecting for optimization of in-mould electromagnetic stirring in the billet and bloom continuous casting

ABSTRACT

In this paper, an electromagnetic torque device based on the theoretical model was established to determine the optimum frequency accurately and conveniently in billet and bloom continuous casting with in-mould electromagnetic stirring (M-EMS). Magnetic characteristics with M-EMS was investigated by numerical simulation and physical experiment with the application of electromagnetic torque device and gauss meter. In addition, the effects of stirring frequency with M-EMS on macro segregation and equiaxed crystal ratio were compared and analysed for 55SiCr with 150 mm × 150 mm billet caster and BU with 310 × 360 mm bloom caster by a series of plant trials, respectively. The results showed that maximum magnetic flux density and maximum electromagnetic torque occurred with different frequency and same current in M-EMS, and central equiaxed crystal ratio and macro segregation has been significantly improved by optimum frequency with M-EMS.

KEYWORDS:

• Electromagnetic torque device
• M-EMS
• billet and bloom casting
• macrostructure
• macro segregation
• optimum frequency
• medium-high carbon steel
• Numerical simulation

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors are grateful for support from the National Natural Science Foundation of China (Grant No. 5177040877); State Key Laboratory of Advanced Metallurgy Foundation (41614014). The authors would also gratefully acknowledge the support on the field test from HANGSTEEL and LONGTENG Special Steel, China.