DEVELOPMENT OF CC BLOOM SURFACE CRACKS DURING HEATING/PIERCING

A study concerning the development of CC bloom surface cracks with different depths during the course of heating/piercing shows that in case of CC blooms with satisfactory internal quality, peeling process contributes to considerable improvement on the surface quality of the shell, while heating/piercing process removes off or reduce the slight flaws on the work piece, and that deeper cracks on the bloom surface develops into outer surface folds of the shell after piercing.