| 摘要 |
PROBLEM TO BE SOLVED: To economically produce a high purity sponge titanium material small in the content of oxygen and the content of metallic elements. SOLUTION: The vacuum separating time in a vacuum separating stage is defined as (t), and the time till the temperature in the central part of the material in a reaction vessel reaches the stable one from the start of the vacuum separation is defined as (to) time, t=to+15 to 35 hr is satisfied. In the vicinal part of the center small in the content of metallic elements in the material, the specific surface area by a BET method reaches <=0.05 m2/g, and even in the case cut crushing is performed in the air atmosphere, the content of oxygen after the cut crushing is suppressed to a low degree.
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