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For connector material applications, the influence alloying elements of Mn, Cr, Fe, and Ti and cold rolling reduction on the mechanical property, electrical conductivity and bendiability of Cu-Ni-Si-P alloy was investigated. The hot rolled plates were solution treated at 980oC for 1.5 h, quenched into water, cold rolled by 10% and 30% reduction in thickness, and then aged at 440~500oC for 3, 4, 5 times. respectively. Cu-Ni-Si-P-x alloys cold rolled by 10 reduction before heat treatment have a good bendability compare to cold rolled by 30 reduction. Cu3.4Ni-0.8Si-0.03P-0.1Ti shows the peak strength value of 759 MPa, an electrical conductivity of 39%IACS, an elongation of 10% and a hardness of 256 Hv aged at 440oC for 6 hrs. Thus it is suitable for lead frame and connector. (Received October 21, 2013; Revised November 8, 2013; Accepted November 12, 2013)

The Influence of Alloying Elements Addition on the Electrical and Mechanical Properties of Cu-Ni-Si-P Alloy