The wettability between electroslag remelting (ESR) slag and non-metallic inclusions influences inclusion removal efficiency. This study establishes two models that quantify the wettability between two inclusions and the content of CaF2 in ESR slags. Three ESR slags with CaF2 content in the range from 30 to 70 wt-% were tested using the sessile drop method, and two inclusions, calcium hexaaluminate (CA6) and Al2O3 are used as substrates. Linear models were developed, correlating the apparent contact angle with CaF2 content in the slag. Industrial tests were also performed. Results revealed that increasing CaF2 content reduces the apparent contact angle for both inclusions. The apparent contact angle between CA6 and the slag consistently exceeded the angle between Al2O3 and the slag. These findings indicate that higher CaF2 content increases the resistance for inclusions to enter the slag, with CA6 having a higher tendency to enter the slag compared to Al2O3.
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