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Synopsis: Summarizing the results of previous investigations on ESR furnaces with ingot diameter from 2 to 60 cm, the empirical equations to express the relations between ingot diameter (D: cm) and various melting parameters have been derived. According to these findings ingot diameter, electrode diameter, slag depth and melting rate are selected as basic parameters, and the dependencies of all other melting parameters on ingot diameter are determined by the former four. The thermal balance between the cooling capacity and the heat release on solidification being taken into account, it is shown that the limiting condition D•Eu<1.9 cmm2/sec (u: solidification rate cm/ sec) must be satisfied for larger ESR ingots. This means that the solidification rate should be in inverse

Estimation of Melting Parameters of a Large ESR Furnace Based on Limiting Solidification Rate