Dynamic Modeling of Unsteady Bulging in Continuous Casting of Steel
Mold level fluctuations caused by unsteady bulging of the solidifying shell affect the quality of the steel and stable operation of the continuous steel casting process. A dynamic bulging model, which captures the behavior of the 2-D longitudinal domain through interpolation of multiple 1-D moving slices, is used to calculate the transient bulging profile, volume changes caused by unsteady bulging, and the accompanying level fluctuations in the mold. The liquid steel flow rate through the SEN into the tundish is calculated with a stopper-position-based model. These two models are combined to investigate mold level fluctuations in a thin-slab caster under real casting conditions. The model is verified by comparing the simulation results with transient measurements in a commercial thin-slab caster.
KeywordsContinuous casting Unsteady bulging Mold level fluctuation Stopper rod flow model Dynamic bulging model
This work was supported by NSF Grant #1300907, NSF INTERN DCL #1747876, and the Continuous Casting Center at the Colorado School of Mines. Special thanks are extended to Nucor Steel Decatur for providing caster data and casting conditions.
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