Formation mechanism of oscillation marks and optimization of oscillation parameters for slab continuous casting with high casting speed

Oscillation marks formation for slab continuous casting with high casting speed was expatiated through stress analyses of initial solidifying meniscus shell during an oscillation cycle with stabilizing casting status at 2.0 m/min casting speed, and the optimizing direction of oscillation parameters along with increasing of casting speed was proposed through the analyses of relationship between oscillation parameters and maximum liquid friction force and maximum flux channel dynamic pressure combined with the influence of oscillation parameters on process parameters and practical equipment condition, finally, the oscillation parameters values as casting speed was 2.2 m/min were determined. The results show that under the action of ferrostatic pressure, friction force and flux channel pressure the oscillation marks are formed along with solidification progress. The amplitude and non-sinusoidal factor should be increased, and oscillation frequency should be decreased with increasing casting speed in order to improve the oscillation effect and the oscillation marks shape. Rational oscillation parameters values are 145 min(-1) (frequency), +/- 5.0 mm (amplitude) and 0.25 (non-sinusoidal factor), respectively, when casting speed was changed from 2.0 to 2.2 m/min.