ROLLING DOWN METHOD OF CRATER END IN CONTINUOUS CASTING

摘要

PURPOSE:To prevent the internal cracking and negative segregation of a billet by detecting the thickness of the unsolidified part near a crater end and rolling down the billet to the thickness of the unsolidified part in the position of the crater end located on the uppermost stream side of casting. CONSTITUTION:The crater end 7a on the uppermost stream side of casting and and the max. value (d) of the thickness of the unsolidified part in said position are detected by a detector. A screw-down device is then moved to the position of the crater end 7a and rolls down the billet at least at a rolling reduction (d). The central segregtion is thus suppressed and the quality is improved.