This study describes systematic measurements of continuous slab casting to quantify the effect of oscillation conditions and superheat on mold powder consumption rate, oscillation mark depth and hook characteristics. Mold powder consumption rate per oscillation cycle depends strongly on positive strip time and also correlates with frequency and negative strip time. Increasing superheat has a strong effect on decreasing hook size, including both hook length and depth. Increasing oscillation frequency shortens solidification time, negative strip time and positive strip time. This results in thinner, shallower hooks and shallower oscillation marks, which should improve surface quality. Higher frequency also shortens hook length and the angle of thick hooks. Increasing the asymmetry of nonsinusoidal oscillation tends to increase mold powder consumption and increases the deflection angle of thick hooks. Hook depth is directly proportional to hook shell thickness. Shallower hooks also correlate slightly with shallower oscillation marks. Because mold consumption, oscillation mark formation and hook formation all depend on so many interdependent process parameters that are difficult to control, much future work is needed to understand their mechanisms in order to accurately predict their behavior. This work is important in order to optimize the process conditions to improve surface quality.
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