In the production of low carbon and low silicon aluminum sedated steel with carbon content less than 0.10% in steel, due to the use of aluminum deoxidation sedation, the steel will be treated with calcium and then cast on the machine. At this time, the carbon in the monoblock stopper will be immersed in the steel to form a decarburization layer. At the same time, the calcium treatment will lead to a large increase in the CaO in the steel. Excessive [Ca] and [CaO] will form a large number of low melting point calcium aluminate mainly 12CaO·7Al2O3 and CaO·Al2O3 in the monoblock stopper matrix into the molten steel and slag to form erosion phenomenon.
In the actual production process, when the content of Al in molten steel is controlled at 0.045% and the content of calcium is controlled at 0.010%, erosion still occurs. Through the field tracking study, it is found that the main reason for the erosion of slag line at this time is that CaO component in the slag layer in the pouring area reacts with Al2O3 in the monoblock stopper matrix to produce the same erosion condition.
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