High strength lead frame material and method of producing the sa

Details High strength lead frame material and method of producing the sa High strength lead frame material and method of producing the sa

1990-06-25

1991-06-25

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 121, 148336, 420 95, C22C 3808, C21D 800

Patent

active

050264354

ABSTRACT:
A high strength lead frame material consists, by weight, of 0.5 to 22% Co, 22 to 32.5% Ni, not more than 1.0% Mn and not more than 0.5% Si and the balance Fe and incidental impurities. The contents of Ni and Co are selected so that the Ni content is 27 to 32.5% when the Co content is less than 12%, and so that, when the Co content is not less than 12%, the Ni content and the Co content meet the condition of 66%.ltoreq. 2Ni+Co.ltoreq.74%. The material has a two-phase structure formed of austenitic phase and martensitic phase, the austenitic phase occupying not less than 50% of the structure.

REFERENCES:
patent: 4203782 (1980-05-01), Yamada et al.

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