Study on deterioration of physicochemical properties of tundish slag for high carbon steel during continuous casting process
Well keeping physicochemical properties of tundish slag during continuous casting is of great significance to stabilize the cleanness of molten steel.In this study,the physicochemical properties of tundish slag for high carbon steel bloom in the process of continuous casting were tested and studied,and the high-temperature phase of molten slag was calculated by a Factsage software,and the evolution laws of its composition,melting point,viscosity and surface tension were analyzed.The results show that the physicochemical properties of slag in tundish pouring zone and impact zone show different changing evolution.With the increase of casting heats,the SiO2 and MgO contents of tundish slag in casting zone increase significantly.Due to the increase of high melting point components,the complete melting temperature rises from 1 325 ℃ to more than 1 500 ℃,the viscosity rises nearly 10 times,the surface tension rises from 0.4 N/m to 0.8 N/m,and the adsorption capacity of tundish slag to inclusions becomes poor.The change law of impact zone is opposite to that of pouring zone,and slag entrapment is easy to occur in the impact zone.
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