Reduction of slivers by the use of an electromagnetic actuator

Abstract

-The submeniscus velocity has a big influence on the surface quality of slabs. Slabs casted with a low casting speed result in a low submeniscus velocity and suffer more from Al-inclusions, while slabs casted with a higher casting speed have a higher submeniscus velocity and suffer more from mould powder inclusions. If the submeniscus velocity can be controlled, the amount of slivers has to be reduced. ArcelorMittal Ghent decided to install an ElectroMagnetic Actuator (EMA) to control this submeniscus velocity. This topic shows what the impact of the EMA can be on slivers.

Model Identification and Control of Electromagnetic Actuation in Continuous Casting Process With Improved Quality

“…A final control loop is realized through electromagnetic stirring in order to regulate the liquid steel flow with the main objective of improving the end product (i.e. slab) quality [22,23]. This is based on electromagnetism, a principle broadly applied in metallurgy [24].…”

“…Experimental tests suggests that an increase in the current leads to a lower meniscus speed, indicating a negative gain of the transfer function model. Using a similar structure as (23), the identified speed model is given by:…”

Optimization of an Electromagnetic Technology in ArcelorMittal Gent for Improving Products Quality in Steel Industry

“…The installed electromagnetic actuator implemented in ArcelorMittal Gent is a MM-EMS technology ( Figure 3) from Danieli/Rotelec [19]. The actuator has to control the mould flow thanks to electromagnetic forces generated in the mould.…”