EMBR
The EMBR (ElectroMagnetic BRake) is designed for location in the mould of a slab caster, where it controls the flow of the hot metal via a static magnetic field. The
EMBR provides the neccesary conditions in the mould for obtaining a major reduction of non-metallic inclusions as well as significantly reduced risk of surface cracks. Some of the most common limitations of high-speed casting are thereby overcome, thus making the EMBR very interesting for high-speed casting and especially for thin slab casting.
The EMBR brakes the metal flow from the casting tube, resulting in decreased steel penetration down into the slab and improved separation of slag inclusions moving up towards the meniscus, which helps to improve the steel cleanliness.
Further, the metal flow speed and temperature at the meniscus are controlled in such a way that both mould powder entrapments from meniscus vortices, turbulence and surface problems from hooks (bending of the solidified shell at the meniscus) are prevented.
The EMBR exists in the following three configurations:
- The Local Field type with two braking areas covering the nozzle outlets.
- The Ruler type with a single braking area covering the total width of the strand, see figure above.
- The FC Mold type, jointly developed between KSC Japan and ABB, with two braking areas one at the meniscus and a second in the bottom of the mould, both areas cover the total width of the strand.
The EMBR has become an essential tool for the future, because it allows the steelmaker to utilise a wider product and productivity range.