ANALYSIS OF LIQUID FLUX CONSUMPTION MECHANISM FOR SLAB CONTINUOUS CASTING MOLD WITH HIGH CASTING SPEED
高拉速板坯连铸结晶器液态渣消耗机理分析

Liquid flux is an effective lubrication in the conventional continuous casting of steel, which can prevent the breakout effectively, and also the longitudinal cracks that occur on strand surface are decreased obviously. Previously, many studies have been reported on the flux infiltration, some empirical equations for calculating flux consumption have been reported based on the data accumulated through the commercial operation of casters, and the new tools and techniques for estimating the lubrication condition in mold have also been introduced. Especially, the lubrication mechanism of liquid flux has drawn general concerns recently, and some relevant simulation of flux infiltration behavior based on the cold model experiments and mathematical models of flux infiltration derived from theoretical calculations have been conducted. Most of these researches lay particular emphasis on the macroscopical detection and calculation to the infiltration behavior, and some researches related to micro–mechanism lack the discussion of the relevant influence factor yet. In the present work, on the basis of calculation of liquid flux channel pressure in meniscus for slab continuous casting mold, a new mechanism of the liquid flux consumption was proposed by analyzing the deformation behavior of initial solidifying shell during the mold oscillation cycle as high casting speed 2.0 m/min, and the concepts of infiltration time and infiltration intensity were defined for the first time, then the effect of non–sinusoidal oscillation parameters on the liquid flux consumption was discussed. The results show that the periodically continued liquid flux consumption is caused by variety of flux channel pressure which is induced by change of channel width, and the liquid flux will be infiltrated into flux channel from last stage of positive strip time until last stage of negative strip time by negative flux channel pressure. The infiltration time is lengthened and the infiltration intensity is weakened by reducing oscillation frequency. The infiltration intensity is strengthened by improving amplitude, and the infiltration time is slimly influenced. Non–sinusoidal oscillation factor has a little effect on the infiltration intensity, and the infiltration time is increased with the oscillation factor decreasing.