| 摘要 |
A copper alloy for an electric connecting device, having Cr in the range from 0.1 to 1 mass %, Zn in the range from 0.1 to 5.0 mass %, and Sn in the range from 0.1 to 2.0 mass %, with the balance being inevitable impurities and Cu, wherein the copper alloy has tensile strength of 600 MPa or more, 0.2% yield strength of 560 MPa or more, electric conductivity of 40% IACS or more, and rupture time of 500 hours or more in a stress corrosion test under a load of 80% of the 0.2% yield strength.
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