A New Type of Mold Taper for Controlling Slab Surface Cracks during Continuous Casting of Micro-Alloyed Steel
By both simulating the characteristics of air gap and mold flux film between the solidifying shell and copper plate,and shell surface temperature distribution in a slab continuous casting mold with the traditionally linear taper,and detecting the metallographic structure and precipitates of micro-alloyed steel slab transverse corner cracks,the generation mechanism of the cracks was clarified,and a new type of mold taper,called as the fully curved surface,which is a combination of wide face copper with wedge shape near its corner region and narrow face copper with a curved surface,was presented.The results of numerical simulation show that the thickness of air gap around shell corner in the mold with this new type of taper can be reduced greatly and the distribution of mold flux film between the shell and copper plate becomes more homogeneous,thus heat transfer efficiency of the mold can be improved significantly and the shell corner can be cooled quickly.The industrial experiment also shows that the grain size of the slab corner could be refined and the precipitates and proeutectoid ferrite films at the grain boundaries could be eliminated,thus the possibility of the occurrence of slab transverse corner cracks can be decreased significantly.
mold taper slab transverse corner crack micro-alloyed steel grain size refine
Miaoyong ZHU Zhaozhen CAI
School of Materials and Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China
国际会议
the 6th International Congress on the Science and Technology of Steelmaking,ICS2015(第六届国际炼钢科技大会)
北京
英文
477-480
2015-05-12（万方平台首次上网日期，不代表论文的发表时间）