| 摘要 |
PROBLEM TO BE SOLVED: To provide a material for a control electrode which enables the suppresion of the unrequired release of electrons from a control electrode. SOLUTION: By weight, 0.005 to 0.05% P is added to an Fe-Ni alloy having a composition containing 30 to 55% Ni, 0.0010 to 0.0200% S, 0.1 to 0.8% Mn, <=0.3% Si and <=0.05% Al, and in which the content of O is controlled to <0.005%, and the balance substantially Fe with inevitable impurities.
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