Reasons for corrosion of slag splash adhesion layer
Experimental studies have shown that the resistance to melting loss of the slag splash layer is related to the TFe content in the slag splash layer. The higher the TFe content, the easier the slag splash layer is melted. Under the same TFe content, the MgO content is high, and the slag splash layer has stronger resistance to melting loss. After the slag splash layer undergoes slag splash-split melting, its melting temperature is very high. In the initial stage of blowing, although the basicity of the slag is low R≤2.0 and the furnace temperature is not high, at 1450～1500℃, the content of (MgO) is close to or reaches the saturated solubility value, so the melting loss of the adhesion layer of splashing slag is not Not serious; the corrosion damage of the slag splash layer mainly occurs in the late stage of converting. Although the basicity of the slag is high, R=3.0～4.0, the content of (MgO) also exceeds the saturation solubility value, but the content of (TFe) is also high, especially When blowing low-carbon steel grades or after blowing, the content of (TFe) is higher, so the slag splash layer is subjected to the dual effects of high temperature melting and high iron oxide slag chemical erosion. Therefore, it is necessary to improve the anti-corrosion ability of the slag splash layer as much as possible, and control the appropriate final slag composition and tapping temperature in order to give full play to the effect of the slag splash protection technology and increase the life of the furnace lining.
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