| abstract |
(57) [Summary] [Object] To obtain a copper alloy sheet having excellent bending workability while maintaining high strength of a Cu-Ni-Si alloy. [Constitution] Ni: 0.4-5 wt%, Si: 0.1-1 wt%, Zn: 0.01 to 10 wt% if necessary %, Sn: one or both of 0.01 to 5 wt%, the balance consisting of Cu and unavoidable impurities, and the X-ray diffraction intensity from the {200} plane on the plate surface being I {20 0}, the X-ray diffraction intensity from the {311} plane is expressed as I {311}, {2 A copper alloy sheet having excellent bending workability, characterized by satisfying the following formula, where the X-ray diffraction intensity from a 20 ° plane is I {220}. [I {200} + I {311}] / I {220} ≧ 0.5 |