Strand electromagnetic stirring (S-EMS) for thick slab casters: Box-type or In-Roll stirrers?

摘要

S-EMS for slabs can be designed as Box-type or In-Roll EMS and is used as single-or double-stage EMS. The choice depends on mechanical and metallurgical questions. In-Roll EMS is an exclusive technology of Danieli Rotelec; Box-type EMS is also available from other suppliers. Both Box-type and In-Roll EMS use linear inductors with horizontally traveling magnetic fields that produce a stirring force to push the liquid steel horizontally along the slab width and generate a butterflytype stirring pattern in the liquid steel (Fig. la), in singlestage, and a triple-zero type stirring pattern (Fig. lb) in double-stage EMS.