| 摘要 |
{Problems} To provide a copper alloy sheet material, which is excellent in the bending property, has an excellent mechanical strength, and is also excellent in the stress relaxation resistance, and which is thus suitable for lead frames, connectors, terminal materials, and the like, for electrical/electronic equipments, for connectors, for example, to be mounted on automotive vehicles, and for terminal materials, relays, switches, and the like. {Means to solve} A copper alloy sheet material, having a copper alloy composition containing 0.5 to 5.0 mass% in total of at least one of Ni and Co, and 0.1 to 1.2 mass% of Si, with the balance being Cu and inevitable impurities, wherein, in a crystal orientation analysis by an electron back scatter diffraction analysis, when an area ratio of the Cube orientation {0 0 1} <1 0 0> at a surface layer of the material is designated as W0, and an area ratio of the Cube orientation at a 1/4 position of the total depth of the material is designated as W4, a ratio of W0/W4 is 0.8 or more, W0 is 5% to 48%, and an average grain size is 12 to 100 µm, and wherein the copper alloy sheet material is excellent in 180° tight bending property and stress relaxation resistance. |
