Copper alloy and its production mannered null mass for lead/read

摘要

PROBLEM TO BE SOLVED: To provide an inexpensive copper alloy for lead frame, excellent in mechanical strength, electric conductivity, heat resistance, and direct bonding property and suitable for lead frame material, and its production. ;SOLUTION: This copper alloy for lead frame has a composition consisting of, by weight, 0.5-5% Fe, 0.01-0.2% P, and the balance essentially Cu with inevitable impurities. Further, 0.05-0.5%, in total, of one or ≥2 elements selected from Sn, Zn, and Pb are incorporated into this composition. The copper alloy for lead frame can be produced by applying hot working to the above copper alloy and then performing, before cold working, two-stage aging treatment consisting of high temp. aging treatment at ≥550°C for ≥0.1 min and low temp. aging treatment at ≤520°C for ≥1 min.;COPYRIGHT: (C)1998,JPO