| 摘要 |
A copper alloy according to the present invention comprises 18 to 30 mass% of Zn, 1 to 1.5 mass% of Ni, 0.2 to 1 mass% of Sn, 0.003 to 0.06 mass% 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]+5[Sn]-2[Ni] <= 30, 14 <= f2 = [Zn]-0.5[Sn]-3[Ni] <= 26, 8 <= f3 = {f1(32-f1)}1/2[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 [alpha] single phase metal structure. |
