The mold inside electromagnetic agitation manner null in the continuous casting

摘要

PURPOSE:To prevent the deep intrusion of inclusion involved into molten steel stream and bubbles of argon, etc., into the inner part of a slab by executing electromagnetic stirring to the molten steel in such an arrangement that each magnetic pole of coils of an electromagnetic stirring device is reverse polarity to each other for the coils facing across a casting mold, while the pole is the same polarity to each other for the coils placed side by side. CONSTITUTION:In the coils (a), a'-(d), d' in the electromagnetic stirring device, two- phase power units composed of transformers 3a-3d and cyclo-converters 4a-4b of two phases (u-phase, v-phase) are wired in each of the coils (a), a', coils (b), b', coils (c), c' and coils (d), d', and on the other hand, in the cyclo-converters 4a, 4b, one set of a frequency setting device 5 is wired. Then, the winding structure of the coils (a), a'-(d), d' is that iron cores constituting four poles is used and u-phase wire winding is executed so that the poles at the upper most step and the pole at the third step become the reverse polarity in the coils (a), a'-(b), b' and the pole at the upper most step and at the third step in the inside coils (a) and (b) or the outside coils a' and b' become the same polarity and also the pole at the upper most step and at the third step across which the inside coils (a), (b) and the outside coils a', b' opposite to each other become the reverse polarity.