Melting method using cold crucible induction melting apparatus, tapping method and apparatus, and titanium and titanium alloy produced using the apparatus

摘要

The present invention provides 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 (10) with an inner diameter of 400mm or more in melting using a cold crucible induction melting apparatus, the melt being tapped through a tapping nozzle (13) provided at the bottom of the crucible (10) and equipped with a tapping coil (22) wound around the circumference of the nozzle (13):7.8 × 2 × log(D) ≤ log (F) ≤ 8.7 - 2 × log(D) (wherein F denotes the frequency of a power supply and D denotes the inner diameter (mm) of the crucible)