Sub Entry Nozzle (SEN)
The Sub Entry Nozzle / Shroud (SEN / SES / TCM-SES) is an iso-statically pressed refractory tube used to control the flow of molten steel from the tundish to the mould. Its primary function is to prevent re-oxidation of steel during transfer. The design of SEN / SES plays a critical role in the casting process by modulating steel flow and influencing the thermal characteristics inside the mould.
Features
- Optimised Design: Bore geometry and port shape are customised to regulate flow dynamics within the mould. Tailor-made designs are available for bloom, billet, and slab casters, depending on casting parameters.
- Choice of Material: A wide range of mixes are available based on steel composition and casting conditions, ensuring high thermal shock resistance and erosion durability.
- Oxidation Resistance: Various glaze compositions are offered to suit different preheating and casting conditions.
- Inner Special Liner: Special SEN designs with liners help minimise clogging and carbon pick-up in steel.
- Cold Start SES: A specially engineered refractory component with very high thermal shock resistance, designed for emergency or initial casting operations.
Thermal Insulation
- Materials such as bio-soluble ceramic fibre or fibre-free insulating coatings are used in SEN and SES for effective insulation
Benefits
- Prevents re-oxidation and inclusion entrapment, resulting in cleaner steel
- Improves flow dynamics for smooth casting operations
- Enhances casting duration with special slag zone mixes
Application
- Flow Control in Continuous Casting: Regulates the transfer of molten steel from tundish to mould.
