Fe-Ni alloys having improved punching properties and punched ele

Details Fe-Ni alloys having improved punching properties and punched ele Fe-Ni alloys having improved punching properties and punched ele

1997-12-15

1999-10-05

O'Shea, Sandra

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313407, 313417, 445 47, H01J 2948

Patent

active

059629657

ABSTRACT:
Disclosed are Fe-Ni alloys used for electron gun parts and press punched electron guns, typically a electron gun electrode manufactured by press punching, comprising: all by weight, 30 to 55% of Ni; 0.0010 to 0.0200% of S; 0.1 to 0.8% of Mn; no more than 0.3% of Si; no more than 0.05% of Al; no more than 0.005% of O; and the balance of substantially Fe and inevitable impurities; said alloy preferably having a crystal grain size of not less than 7.0 in grain size number based on JIS G 0551. When oxide-type inclusions are included, Mn and S which form MnS combine with the oxide-type inclusions, so that MnS which is effective for improvement of punching properties do not sufficiently precipitate. Therefore, the invention controls contents of elements forming oxides in proper ranges.

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