Application Of Calcium Silicon-aluminum-barium As A Compound Deoxidizer in Steelmaking

  Steel deoxidation is an essential process in the steelmaking process. As a compound deoxidizer, calcium barium silica-aluminum has the advantages of strong deoxidation ability and can significantly improve the purity of the steel. With the use of calcium barium silica-aluminum deoxidation treatment, one can give full play to the strong deoxidizing agent deoxidation, the second is to change the composition of the deoxidation products, to create more favorable conditions for inclusions to float, so as to improve the liquidity of the molten steel and improve the purity of the molten steel.

    Aluminum element in calcium barium silica-aluminum as the traditional steelmaking deoxidizer, because of the strong affinity of aluminum and oxygen and aluminum, iron, completely miscible properties, which also determines the status of aluminum as a steelmaking end deoxidizer must be part of a long time is difficult to change, but because aluminum is easy to form high melting point deoxidation products in steel so that the liquidity of the molten steel becomes poor, will seriously affect the castability of the molten steel, and thus the smooth production of continuous casting, Therefore, the amount of aluminum added to the steelmaking deoxidizer is limited.

    The introduction of strong deoxidizing element calcium element in the deoxidizer containing aluminum element can effectively denature the high melting point inclusions produced by deoxidation, thus significantly improving the fluidity of aluminum deoxidized steel, but because calcium itself still has the weakness of low solubility in steel, light specific gravity, high vapor pressure. Therefore, how to improve its effective utilization rate, become the composition of the deoxidizer must be considered when determining the problem. The element barium not only has a large specific gravity, the low vapor pressure of the strong deoxidizer, but also with calcium completely soluble, and with its content increases significantly reduce the vapor pressure of calcium.