High-strength lead frame material and method of producing same

Details High-strength lead frame material and method of producing same High-strength lead frame material and method of producing same

1992-09-18

1993-09-21

Dean, H.

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148624, 148707, 148328, 148336, 148419, 148442, 420 95, C22C 3808

Patent

active

052465110

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, not more than 0.5% Si, at least one kind of 0.1 to 3.0% in total selected from the group consisting of Nb, Ti, Zr, Mo, V, W and Be, and the balance Fe and incidental impurities; the total content of Ni and Co being selected so that the content of Ni is in the range of 27 to 32.5% when the content of Co is less than 12% and so that 66%.ltoreq.2Ni+Co.ltoreq.74% is met when the content of Co is not less than 12%; the lead frame material having a duplex-phase structure composed of a reverse-transformed austenite phase (which can involve a residual austenite phase) and a martensite phase; and the austenite phase being not less than 50%.

REFERENCES:
patent: 5026435 (1991-06-01), Nakamura et al.
patent: 5147470 (1992-09-01), Nakamura et al.

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