| 摘要 |
A copper alloy according to the present invention comprises 18 to 30 mass pcnt of Zn, 1 to 1.5 mass pcnt of Ni, 0.2 to 1 mass pcnt of Sn, 0.003 to 0.06 mass pcnt of P and a remainder made up by Cu and unavoidable impurities, wherein the relationships represented by the formulae mentioned below are satisfied: 17 = f1 = [Zn]+5x[Sn]-2x[Ni] = 30, 14 = f2 = [Zn]-0.5x[Sn]-3x[Ni] = 26, 8 = f3 = {f1x(32-f1)}1/2x[Ni] = 23, 1.3 = [Ni]+[Sn] = 2.4 and 1.5 = [Ni]/[Sn] = 5.5 and 20 = [Ni]/[P] = 400. The copper alloy has an a single phase metal structure. |
