High strength lead frame material and method of producing the sa

Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal

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148336, 148442, 148707, 420 95, C22C 3808

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active

051474700

ABSTRACT:
A high strength lead frame material consists essentially, 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 multi-phase structure formed of austenitic phase, martensitic phase, and ferritic phase, the austenitic phase occupying not less than 50% of the structure.
The method of producing the alloy of the invention comprises the steps of solid-solutioning the material of the above composition at a temperature not less than austenitizing completion temperature, cold-rolling the material at a rate of 40 6to 90% in reduction, and annealing the material at a temperature less than the austenitizing completion temperature.

REFERENCES:
patent: 4203782 (1980-05-01), Yamada et al.
patent: 5026435 (1991-06-01), Nakamura et al.

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