ELECTROMAGNETIC STIRRER FOR BILLET CASTERS

The electromagnetic stirrers are used in the continuous casting process to improve the product quality and to increase the steel production. According to the position along the casting strand and metallurgical effects, stirrers can be classified mould, strand and final stirrers. The benefits obtained using one or more EMS in combination include surface and sub-surface quality, internal and central soundness as segregation, porosity and central cracks.

There are three kinds of EMS as per the installation position:
1. Mould Electromagnetic Stirrer : M-EMS
2. Strand Electromagnetic Stirrer: S-EMS
3. Final Electromagnetic Stirrer: F-EMS
By and large, so far, steel plants use M-EMS

EMS inside mould using mould water: EMS is installed inside the mould and uses cooling water system of the mould. It can be operated conveniently with low cost. Stirring freq: 2 ~ 8Hz.

EMS inside mould using clean water: EMS is installed inside water jacket of the mould and uses a separate cooling water system. Structure is compact and life is long. Stirring freq: 2 ~ 8Hz.

EMS outside mould: EMS is installed outside the mould with separate cooling water system. It is simple to change copper tube. EMS can be used for wide range of sections. Stirring freq: 2 ~ 5Hz.

Inner cooling type ems:can be installed inside or out the mould.cramer windings are adopted,which has even magnetic field without polarization.But magnetic leakage is too much with electromagnetic pollution cooling water quality has to be very strict and operation cost is higher.Stirring freq is 1~ 6Hz.

Final EMS (F-EMS)
F-EMS uses rotate magnetic field with long iron core. Central magnetic induction is strong and application range is wide. Stirring effect shall be ensured with alternating or intermittent stirring.