CAC58 copper alloy for miniaturized automobile terminals

In order to take advantage of the excellent stress relaxation characteristics of Cu-Ni-Sn base alloys such as C72500, a new pseudo-spinodal hardening alloy of Cu-1.5%Sn-0.4%Ni-0.02%P-1.5%Zn, with low Ni and Sn concentrations, has been developed. This alloy has a yield strength of 550 N/mm exp 2 , an electrical conductivity of 34%IACS, excellent bend formability (180 deg bending at 0 radius), and excellent stress relaxation resistance (170 deg C). Furthermore, because of the addition of Zn, the alloy adheres well to tin-plated layer, making it highly suitable for the small terminals used in the area around automobile engines. Materials studied: CAC58, C51910.