IMPROVED STEEL QUALITY AND REDUCED PRODUCTION COST USING INDUCTION STIRRING

摘要

Electromagnetic stirring improve quality and productivity and reduce costs in continuous casting and ladle refining of steel. For continuous casting ABB supplies the full range of electromagnetic stirrers, EMS, for billets, blooms and slabs. The ElectroMagnetic BRake, EMBR, and Flow Control Mold, FC Mold, reduce corner cracks, longitudinal cracks, breakouts, quarter-band inclusions, mold powder entrapments and surface defects in slab casting. With the use of FC Mold II it is possible to control the meniscus and penetration flow independently and by that assure optimum conditions for all casting practices. Mold EMS, MEMS, reduces surface and subsurface defects, lowers the breakout ratio and gives a better inner quality. Strand EMS, SEMS, reduces segregation, porosity and cracks in the central part of the strand. Final EMS, FEMS, in combination with MEMS or SEMS further reduces centre segregation and porosity. Electromagnetic stirring in ladle furnaces improves the chemical and thermal homogenization, increases productivity and leads to superior steel cleanliness. Electromagnetic stirring gives substantial cost savings compared to gas stirring, with the investment often recovered in one to two years.