| 摘要 |
PURPOSE: To provide a high strength high electric conductivity copper alloy that is excellent in strength and formability, easy in production management and suitably used as a conductive spring material for terminals, connectors, relays and switches. CONSTITUTION: The high strength high electric conductivity copper alloy comprises 0.05 to 1.0 mass% of Cr, 0.05 to 0.25 mass% of Zr, and the balance being Cu and inevitable impurities, wherein a ratio of coincidence site lattice Σ3 at the grain boundary is 10% or more in case that a space between each crystals is regarded as a grain boundary when misorientation of adjacent grains is 5 degrees or more of an angle, wherein the copper alloy further comprises 0.01 to 1.0 mass% of one or more elements selected from the group consisting of Zn, P, Fe, Mg, Mn, Al, Co and Ni, wherein the cooper alloy comprises 0.6 mass% or less of Cr and has an elongation of 8% or more, and wherein the cooper alloy comprises 0.2 mass% or less of Cr and has an elongation of 10% or more. |
