CFD Optimization of a Six-Strand Continuous Casting Tundish at Georgsmarienhütte GmbH

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The liquid steel flow, the slag and the non-metallic inclusions behavior inside of the Six-Strand Tundish at Georgsmarienhütte GmbH were investigated. A three-phase free surface flow with an extreme density ratio (liquid steel, liquid slag, air) was simulated. The Euler-Lagrangian model was implemented to calculate the behavior of inclusions within the liquid steel. Although temperature-dependent properties of slag, steel and air were implemented, all calculations were performed under isothermal conditions. The steady-state data was computed by performing a transient calculation for ten minutes of physical time and this was used as the starting point for the injection of non-metallic inclusions. A total amount of about 2600 particles within a timespan of 0.2s was randomly injected in the ladle shroud. The particles size was chosen according to Gaussian distribution (10μm-10%; 20μm -40%; 40μm -40%; 65μm -10%) and the temperature of the liquid phases was 1530°C. Steel and slag physical properties such as viscosity, density, specific heat, thermal conductivity, etc. were chosen according to data used in VDEh CFD-Ladle-Benchmark. The turbulent flow of the liquid steel and its influence on inclusions behavior were analyzed. The simulated distribution of the non-metallic inclusions in blooms was compared with experimental results. The quantitative assessment of non-metallic inclusions in samples from the monitored industrial casts was measured by means of ultrasonic inspection. The simulation results show a high degree of correlation to those obtained by experiments.

Author Company: 
Georgsmarienhütte GmbH
Author Name: 
Eike Runschke