Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Model Experiment and Theoretical Analysis for the Effect of Electromagnetic Pressure on Surface Quality of Continuous Castings
Ikuhiro SUMIKensuke SASSAShigeo ASAI
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1992 Volume 78 Issue 3 Pages 447-454

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Abstract

Being aimed to improve the surface quality of a continuously cast steel, a new electromagnetic casting method is proposed where the high frequency magnetic field is imposed on the initial stage of solidification from the outside of a mold. The magnetic pressure induced by the magnetic field provides the solidification taking place under the soft contacting pressure of molten metal with the mold, so called soft contacting solidification. Molten tin was cast by imposing magnetic field with 1.75, 3.75 and 15.4 kHz frequency in order to examine the applicability of the method to the cast of steel. It is found that this electromagnetic casting method has a potential to be applied to the cast of steel. The stronger intensity of magnetic field could provide the better surface quality of products in the way of reducing oscillation marks. However, the excess intensity of magnetic field caused the disturbance on meniscus inducing surface defects. The critical intensity of magnetic field at which the surface defects due to fluid disturbances at meniscus appeared increased with increasing the frequency of magnetic field. It is noticed that the effect of magnetic field on reduction of surface defects appears more significantly when mold oscillation was not applied than when the oscillation was applied.

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© The Iron and Steel Institute of Japan
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