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Continuous Casting Slab Mold: Key Role of Nozzle Immersion Depth
Liang Chen1, Xiqing Chen1, Pu Wang1
1School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 100083, China.
Materials (Basel, Switzerland)
|October 16, 2024
Summary
Optimizing submerged entry nozzle (SEN) depth in slab casting is crucial. The ideal SEN depth balances mold surface behavior and slag entrapment, with 110 mm or 190 mm offering the most stable conditions for continuous casting.
Area of Science:
- Materials Science
- Chemical Engineering
- Fluid Dynamics
Background:
- Continuous casting is a vital process in steel production.
- Submerged entry nozzle (SEN) design significantly impacts casting quality.
- Understanding SEN depth effects is critical for preventing defects like slag entrapment.
Purpose of the Study:
- To investigate the influence of submerged entry nozzle (SEN) depth on mold behavior in slab casting.
- To identify optimal SEN depths for minimizing slag entrapment and ensuring stable casting.
- To analyze the effects of SEN depth on flow field, temperature, and solidification.
Main Methods:
- Utilized a physical water model with a 0.5 scaling factor.
- Employed a coupled numerical model for flow, heat transfer, and solidification.
- Analyzed mold surface behavior, slag entrapment, internal flow, and temperature distribution.
Main Results:
- Shallow SEN depths (80 mm) lead to thin slag layers and entrapment.
- Increasing SEN depth (up to 170 mm) reduces mold impact and promotes recirculation, but can increase entrainment risk.
- Optimal stability observed at 110 mm; deeper immersion (190 mm) also shows promise, avoiding a critical depth range.
Conclusions:
- SEN depth critically affects slag behavior and casting stability.
- A shallower (approx. 110 mm) or deeper (approx. 190 mm) SEN immersion is recommended over intermediate depths.
- Proper SEN depth control is essential for high-quality continuous casting.
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