Abstract
The electromagnetic model of a large-bloom continuous casting was established to simulate the magnetic field. The model 3600 digital, high-precision, three-dimensional Gaussian meter was used to measure the internal magnetic field of mold electromagnetic stirring (M-EMS). The distribution of simulated magnetic field was basically consistent with that of the measured magnetic field; the accuracy of electromagnetic stirring model was verified. With the increase of current frequency, the electromagnetic force first increases and then decreases; when the current frequency is 9 Hz, the electromagnetic force reaches its maximum value. A bipolar electromagnetic stirring model is proposed; the influence of current intensity and distance were investigated. With the increase of current intensity of lower mold electromagnetic stirring (M-EMSB), the internal magnetic intensity of upper mold electromagnetic stirring (M-EMSA) gradually increases, and the middle region is gradually filled by magnetic field. With the increase of the distance, the range of the low-intensity magnetic field expands. When the current intensity of the M-EMSB is 320 A, and the distance is 400 mm, an 8 mT uniform magnetic field in the range of 1.2 m is formed. Compared with the traditional continuous casting electromagnetic agitator, the center equiaxial crystal of bipolar electromagnetic agitator increases from 30.3% to 49.5%.
Highlights
With the maturation of electromagnetic stirring technology, it has been widely used in the production of large-bloom continuous casting
According to the metallurgical effect and the installation position of electromagnetic agitator, it is usually divided into mold electromagnetic stirring (M-EMS), strand electromagnetic stirring (S-EMS), electromagnetic stirring (F-EMS) and combinations (M + S-EMS, M + F-EMS, M + S + F-EMS) [1,2]
The current frequency of M-EMS is very low, which belongs to the quasi-stable electromagnetic field, so the displacement current can be ignored
Summary
With the maturation of electromagnetic stirring technology, it has been widely used in the production of large-bloom continuous casting. Due to the low solidification density, low production efficiency and low yield of ingot casting, China built the world’s first vertical round billet caster with the largest section of 800 mm in 2015 [3]. Due to the lowand solidification bipolar electromagnetic stirring technology further improves the uniformity coverage of density, low production efficiency and low yield of ingot casting, China built the world’s first magnetic flux, improves the penetration of magnetic field and improves the solidificationvertical density of round bloom. In with orderthetolargest accurately the inchange periodic stirring technology further improves the uniformity and coverage of magnetic flux, improves theused magnetic field, the model 3600 digital, high-precision, three-dimensional Gaussian meter was penetration of magnetic field and improves the solidification density of the large bloom. The numerical simulation of Metals 2020, 10, 516 the electromagnetic stirring magnetic field was carried out by using the verified electromagnetic model
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