Yamaha Corporation

Tsuyuki Watanabe

Jun Kato

Naofumi Nakamura

In composition of Fe-Ni alloy preferably used for lead frames in production of IC, specified amount of Be is added to the basic composition for increase in mechanical strength whilst maintaining the low thermal expansion characteristic of the conventional Fe-Ni alloys.

Fe-Ni alloy and method for producing the same

In composition of a Fe-Ni alloy used for television shadow masks and containing in, Co, Mn, Si and Cr as the major components, additional inclusion of Be assures high deformation resistance and easy pore formation via etching without impairing its inherent low thermal expansion. Introduction of annealing at 800.degree. to 1200.degree. C. temperature into production process sufficiently lowers proof stress of the product without causing any noticeable crystal coarseness. Increased mechanical strength enables production of a thin shadow mask material well suited for pore formation via etching, thereby assuring high grade screen display.

Method for manufacturing a shadow mask of a Fe-Ni alloy

In composition of Fe-Ni alloy preferably used for lead frames in production of IC, specified amount of Be is added to the basic composition for increase in mechanical strength while maintaining the low thermal expansion characteristic of the conventional Fe-Ni alloys.

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Shizuoka, Japan

Tsuyuki Watanabe