To Minimize or Eliminate Bursting (Casting Defect) on En353 Steel

The present work aims to minimize or eliminate Bursting on EN353 steel. Bursting is happening because of the presence of Aluminium (Al) in steel. When Al in steel combine with SiO2 in slag in copper mould then Aluminium oxide is formed. Aluminium oxide does not completely dissolve in slag due to high viscosity of the slag as a result they start precipitating and start causing depression on the solidifying shell. With increase in viscosity, diffusion of aluminium oxide in slag decreases which results chances of bursting in steel. These Aluminium oxide particles also help to increase the thickness of crystalline layer which results decrease in heat transfer. With decrease in heat transfer out of the mould unsteady condition exists which results decrease in solidification of the molten metal. The problem bursting is solved by making some changes in the powder to decreases the viscosity of the powder. TiO2 and Fe2O3 additional elements added. Na2O% and K2O% increased. These changes in the slag helps to decrease the viscosity of the slag as a result solubility of Al2O3 in molten slag increase and Bursting is eliminated.