High-strength and high-electrical conductivity copper alloy rolled sheet and method of manufacturing the same

摘要

In a high-strength and high-electrical conductivity copper alloy rolled sheet, 0.14 to 0.34 mass % of Co, 0.046 to 0.098 mass % of P, 0.005 to 1.4 mass % of Sn are contained, [Co] mass % representing a Co content and [P] mass % representing a P content satisfy the relationship of 3.0≦([Co]−0.007)/([P]−0.009)≦5.9, a total cold rolling ratio is equal to or greater than 70%, a recrystallization ratio is equal to or less than 45% a an average grain size of recrystallized grains is in the range of 0.7 to 7 μm, an average grain diameter of precipitates is in the range of 2.0 to 11 nm, and an average grain size of fine crystals is in the range of 0.3 to 4 μm. By the precipitates of Co and P, the solid solution of Sn, and fine crystals, the strength, conductivity and ductility of the copper alloy rolled sheet are improved.