| 摘要 |
Provided is a copper alloy sheet having a composition containing 1.0 to 6.0 mass% Ni, and 0.2 to 2.0 mass% Si, further containing a total of 0 to 3.000 mass% of at least one type of element selected from the group comprising B, Mg, P, Cr, Mn, Fe, Co, Zn, Zr, Ag and Sn, with the remainder comprising copper and unavoidable impurities, wherein: the strain hardening exponent, nRD, in the rolling direction, RD, is 0.010 to 0.150; and the ratio, nRD/nTD, between nRD and the strain hardening component, nTD, in the transverse direction, TD, is 0.500 to 1.500. On the surface parallel to the rolled surface of the copper alloy sheet at a depth D, the average value, Sa, of the area ratio, S(D), of crystal grains in which the angle of deviation from cube orientation {001}<100> is within 15° is 5.0 to 30.0%. Thus, the copper alloy sheet has: excellent bendability; excellent strength; a low deflection coefficient as a spring property after bending work; and little specificity for each of the properties of bendability, strength and deflection coefficient in the rolling direction and transverse direction. |
