Abstract: High speed casting is attracted much attention of people for its efficient production.In which,compact strip production (CSP) is the typical casting technology, which casting speed of 3～6 m/min,even up to 9 m/min.The requirements of the mold fluxes become quite strict because that many parameters in the mold have been changed with the improvement of the casting speed.In this paper,the mold flux of medium carbon steel for CSP was studied and its properties were compared with the mold flux for traditional low speed casting. The results show that the mold flux for high speed casting of medium carbon steel needed better lubrication,and the viscosity at 1 300 ℃ should be lower than 0.086 Pa·s (casting speed: 3.5 m/min).The horizontal heat flux from solidified shell to the mold wall has increased greatly due to the high speed casting. In order to avoid the bad quality of the casting billet caused the fast heat transfer due to the high speed casting, the mold flux which had more uniform and stronger ability to control the heat should be applied.

Key words: high speed casting, traditional continuous casting, thin slab continuous casting, heat transfer, mold flux