Tundish Lower Plate System-20 Heats

Lower Nozzles (also referred to as: exchangeable nozzles, flying nozzles, shooting nozzles, quick-change nozzles, outer nozzles, inferior nozzles)
The lower nozzle is located within an assembly that is fixed to the bottom of the Tundish.  Once the nozzle wears out or the casting speed needs to be reduced the lower nozzle can be exchanged with either a new lower nozzle or a blank nozzle to shut the strand off entirely.  Lower nozzles must be erosion resistant to enable long casting sequences.  In addition to this lower must be able to withstand cold start practises or oxygen lancing.  Therefore a balance of erosion resistance and thermal shock resistance must be achieved.  This balance is achieved with Dyson’s ZPZ-D zirconia inserts. ZPZ-D provides high density for erosion resistance, yet the unique granulometry of the material gives the nozzle enhanced thermal shock resistant properties.

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