Investigation On Viscosity And Melting Temperature Of V-Cr Containing Hot Metal

Recently,the comprehensive utilization of Hongge vanadium titanium magnetite Ore obtained extensive attention of metallurgists.The ironmaking and steelmaking process is greatly influenced by the fluidity of hot metal.The viscosity and melting temperature are important parameters for characterizing the fluidity of hot metal.Therefore,investigation on the hot metal composition on the relationship between viscosity and temperature plays an important role on the comprehensive utilization of Hongge Ore.In the present study,a viscosity measurement equipment has been designed based on the theory of the cylinder torsion vibration method through fixing damped amplitude difference.The influence of the content of C,Ti,S,Cr and V on the viscosity and melting temperature of V-Cr containing hot metal was investigated.The mechanism is also analyzed.Result shows that the content of Ti and C have a greater influence on the viscosity and melting temperature of V-Cr containing hot metal.In the range of carbon content 2.60wt%~4.00wt%,the viscosity of hot metal decreases with the increase of carbon content.When the carbon content exceeds 4.00wt%,the viscosity of hot metal increases because of the superheat of the melt and the precipitation of carbide.The viscosity and melting temperature of V-Cr containing Hot metal increase rapidly with titanium content increasing when the titanium content exceeds 0.31wt%.The viscosity and melting temperature increase rapidly when the vananium and chromnium content are more than 0.30wt% and 0.84wt%,respectively.However,the viscosity will decrease modestly with vinanium content increasing when vatanium content is below 0.30wt%.Unlike V and Cr,the sulfer increase the viscosity of Fe-S melts in the sulfer content range of this experiment and can interact with the other elements in V-Cr containing hot metal.It causes the greater increasing of the viscosity and melting temperature when sulfur content exceeds 0.08wt%.The results of industrial hot metal are consistent with those of single factor analysis.From the investigation of inclusion distribution under the temperature near melting temperature of sample,a large number of carbides which make up by the carbide of titanium,vananium and chromnium were found.The titanium carbide has the largest shape which means that the precipitation of titanium carbide has the largest influence on the the viscosity and melting temperature of V-Cr containing hot metal.