Regular Article

Application of chamfered narrow face mold technology to reduce longitudinal surface crack defects of hyperperitectic steel generated during flexible thin slab casting process

¹ National Engineering and Research Center for Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing,  PR China
² State Key Laboratory of Advanced Steel Processing and Products, Central Iron and Steel Research Institute, Beijing,  PR China

^* e-mail: mengying512712_2005@126.com

Received: 18 December 2016
Received in final form: 23 February 2017
Accepted: 3 April 2017

Abstract

Mold wear can occur at the interface between slab and mold when slab moves downward through the mold during casting. Longitudinal surface cracks in continuous casting process of slab are closely related with inadequate amount of narrow face taper. Optimizing inner structure and adjusting taper of narrow face mold were helpful in improving contact situation between mold and solidified shell to achieve uniform solidifying shell and to avoid forming longitudinal surface cracks. A chamfered narrow face mold for flexible thin slab casting process was developed and implemented successfully in industrial production process. The relationship between wear profiles of narrow face mold and occurrence of longitudinal surface cracks has been researched. The results show that a chamfered narrow face mold can effectively compensate the narrow side shell shrinkage along slab width direction to reduce the occurrence of longitudinal surface cracks.