关键词: 高拉速, FC结晶器, SEN, 平均热流, 保护渣, 铸坯质量

Abstract: Based on the application of 2.5 m/min high speed continuous casting on low carbon conventional slab in SGJT No.3 caster, the mathematical model of fluid, heat transfer and friction force validated by actual data was established to analyze the related technology. The results show that the mold level could be well controlled by the use of FC mold and SEN with the angle of －20°. The crater end point validated by pin shooting method even at 2.5 m/min was in the range of caster length by improving the secondary cooling water flow rate while the highest temperature in the hot side of mold copper plate was beyond 350 ℃. Furthermore, a kind of mold powder with lower viscosity and better lubrication was employed, and the consumption rate was less that 0.3 kg/m2 at 2.0 m/min or over while there was no breakout occurring. In the near future, development of nonsinusoidal oscillation curve may be a feasible choice. Finally, subsurface inclusions of slab decreased and surface quality of cold coils was improved with casting speed increase.

Key words: high speed casting, FC mold, SEN, average heat flux, mold powder, slab quality