Measurement and Calculation of Magnetic Flux Density During Mold Electromagnetic Stirring on a Continuous Casting Bloom Mold

In the current study, a three-dimensional measurement of the magnetic flux density was performed for a 280 mm width × 250 mm thickness continuous casting bloom mold installed with electromagnetic stirring with varied current intensity and frequency. The magnetic flux density increased gradually to a peak value and then decreased along the downward vertical direction, and it decreased in the transverse direction from the copper plate to the center of the mold. The electromagnetic field in the mold and the stirrer was calculated, and the node loading method was used to model the current input. The effect of the mesh size on calculation accuracy was investigated, and it was found that the 0.02-m cell size for the mold and the 0.001-m cell size for the coil conductor and the iron core were enough to achieve good agreement between the calculation and measurement. It was revealed that the stainless metal shell of the stirrer and the molten steel flow had little influence on the magnetic flux density. The following empirical equation was obtained to calculate the local magnetic flux density along the vertical distance: