Crystallization of CaO-SiO2-TiO2 slag as a candidate for fluorine free mold flux

The time-temperature-transformation diagram (TTT diagram) of CaO-SiO2 TiO2 slag has been determined by using differential thermal analysis (DTA) in order to investigate the crystallization of the slag as a candidate for fluorine free mold flux. The incubation time of CaOSiO2TO2 in CaO-SiO2 TiO2 slag is as small as that of cuspidine (3CaO(2)SiO(2)CaF(2)) in commercial mold fluxes. This finding indicates that the CaOSiO2TO2 crystallizes rapidly in the slag film between the mold and the steel in the continuous casting machine, similar to cuspidine in commercial mold fluxes. CaOSiO2TO2 in CaO-SiO2TO2 slag is substituted for cuspidine in commercial mold fluxes. The thickness of the crystalline layer of CaOSiO2TiO2 is smaller than that of cuspidine. In order to improve the heat transfer control of CaO-SiO2 TO2 slag, it is necessary to decrease the incubation time of CaOSiO2TO2 at high temperature.