| 摘要 |
PURPOSE:To enable easy adjustment of the oxygen content in an ingot and the production of a low oxygen-content ingot by evacuating a melting atmosphere while introducing a nonoxidizing gas into said atmosphere at the time of melting raw materials contg. an active metal. CONSTITUTION:The raw materials G are melted by irradiating an electron beam B from an electron beam irradiating device 2a on said material while the raw material G contg. the active metal such as Ti or Zr is continuously supplied into a water cooled vessel 4 of an electron beam melting device. The molten metal M formed in such a manner is fed into a water cooled casting mold 8 and is successively cooled to solidify. The ingot I is continuously drawn by a drawing device 9. The inside of a shielding case 1 is evacuated to a vacuum by a discharge system 5 while the nonoxidizing gas such as Ar, He or H2 is introduced through a flow rate regulating valve 12 into the case 1 in the stage of melting.
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