TANG Ping
,
XU Chushao
,
WEN Guanghua
,
ZHAO Yanhong
,
QI Xin
钢铁研究学报(英文版)
An experimental apparatus for simulating copper mold is used to quantify the heat flux through the slag film and to obtain a solid slag for further determining its crystallization behavior. The result indicates that both the chemical composition of the mold powder and the cooling rate have an important influence on the heat flux through the slag film. With increasing the binary basicity, the heat flux of slag film decreases at first, reaches the minimum at the basicity of 14, and then increases, indicating that the maximum binary basicity is about 14 for selecting “mild cooling” mold powder. The heat transfer through the slag film can be specified in terms of the crystalline ratio and the thickness of the slag film. Recrystallization of the solid slag occurs and must be considered as an important factor that may influence the heat transfer through the solid slag layer.
关键词:
continuous casting;mold powder;slag film;heat flux;crystallization
QI Xin
,
et al
钢铁研究学报(英文版)
This work systematically researches the relationship between the binary basicity (CaO/SiO2), TiO2, Na2O, Li2O, MgO, MnO, B2O3 and viscosity in fluoride-free and titanium-bearing mold fluxes. The results of these experiments indicate that Li2O, B2O3 and Na2O play major roles in decreasing viscosity, especially Li2O, which is the most effective flux, while MgO and MnO exert little effect on viscosity. Meanwhile, the conclusion was also reached that, with increased TiO2 content, the viscosity of fluoride-free and titanium-bearing mold fluxes increases at first but then falls when the amount of TiO2 is greater than 6.0 wt%. Based on large amounts of experimental statistics of the viscosity of fluoride-free and titanium-bearing mold fluxes, a predictive model was built from the principles of the Weymann-Frenkel formula. This model can be used to predict the viscosity of fluoride-free and titanium-bearing mold fluxes. In fact, the predicted values approximate the observed values with a ±10.6% average deviation. Compared with the classical models, for which the average deviation is higher, we find that the new model can be applied to estimate the viscosity of fluoride-free and titanium-bearing mold fluxes.
关键词:
Viscosity;Fluoride-free and titanium-bearing mold fluxes;Model;Continuous casting
