| 摘要 |
A copper alloy sheet has a chemical composition comprising 0.1 to 5 wt % of nickel, 0.1 to 5 wt % of tin, 0.01 to 0.5 wt % of phosphorus and the balance being copper and unavoidable impurities, and has a crystal orientation satisfying 2.9≦̸(f{220}+f{311}+f{420})/(0.27·f{220}+0.49·f{311}+0.49·f{420})≦̸4.0, assuming that the degree of orientation of a {hkl} crystal plane measured by the powder X-ray diffraction method on the rolled surface of the copper alloy sheet is f{hkl}. |
