Study on the Mold Slag with High Al2O3 Content for High Aluminum Steel

The slag-steel equilibrium reaction which is simulating the composition and properties changes of the newly developed mold slag for 20Mn23AlV steel was carried out at high temperature in the laboratory. The crystal morphology of the newly developed original slag and final slag was studied by the SEM and XRD analysis. The composition and properties changes of the newly developed mold slag were also compared with the two currently used mold slag for 20Mn23AlV steel. Results show that the SiO2 is increased by 0.7 Wt Pct and the Al2O3 is decreased by 8.18 Wt Pct, and the melting temperature, viscosity and crystallization rate are increased by 62 K, 0.66 dPa.s and 15 Pct respectively. The final slag of the newly developed slag has precipitated NaAlSi3O8 and CaAl2Si2O8, and both the original slag and final slag have a small amount of LiF crystal and have a good glass form. The newly developed mold slag has small composition and properties changes compared with the two used mold slag.