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It is an effective way to decrease power consumption, pollution emission, to increase productivity and improve ingot quality by using lower CaF 2  content even CaF 2  free slag during the electro-slag remelting (ESR) process. In this study, a conventional slag, namely ANF-8 with composition of 60 mass%CaF 2 -20 mass%CaO-20 mass%Al 2 O 3  was chosen as a reference slag. A new quaternary slag system of CaF 2 -CaO-Al 2 O 3 -SiO 2  with four lower CaF 2  content levels in mass fraction, 59%, 55%, 50%, 45% were prepared and labeled as S 1 , S 2 , S 3  and S 4  respectively. The effects of CaF 2  content and temperature on the physical properties of the slag were investigated. The results showed that the melting points and the conductivity of the samples S 1 –S 4  were all lower than those of the sample ANF-8. The melting point and the conductivity (1600 °C) of Sample S 4  achieved 1372 °C and 1.936 Ω −1 ·cm −1 , respectively. The conductivities of Sample S 4  at 1550–1650 °C reached 1.741–2.131 Ω −1 ·cm −1 , and were lower than those of ANF-8 and S 1 –S 3 . Considering the physical properties of the four new slags in the CaF 2 -CaO-Al 2 O 3 -SiO 2  quaternary system and low CaF 2  in the slag to decrease the power consumption and pollution emission, the slag S 4  was the most suitable for the ESR process.

The Physical Properties of Slags for Electro-slag Remelting in CaF 2 -CaO-Al 2 O 3 -SiO 2 System