Melting method using cold crucible induction melting apparatus

Abstract

The present invention relates to a melting method by which the melting raw materials having a variety of configurations are collectively melted to enable the composition to be adjusted in the melt, and a melting apparatus and tapping method by which tapping is readily controlled, wherein the raw materials are melted by flowing an electric current satisfying the frequency range defined by the equation below using a crucible with an inner diameter of 400 mm or more in melting using a cold crucible induction melting apparatus, the melt being tapped through a tapping nozzle provided at the bottom of the crucible and equipped with a tapping coil wound around the circumference of the nozzle: 7.8.times.2.times.log(D).ltoreq.log(F).ltoreq.8.7-2.times.log(D) (wherein F denotes the frequency of a power supply and D denotes the inner diameter (mm) of the crucible).

Dependencies are inferred from the claim text.