Patent ID: 8147751

Claim:
A silver-white copper alloy comprising: 47.5 to 50.5 mass % of Cu; 7.8 to 9.8 mass % of Ni; 4.7 to 6.3 mass % of Mn; and the remainder including Zn, wherein the silver-white copper alloy has an alloy composition satisfying relationships of f1=[Cu]+1.4×[Ni]+0.3×[Mn]=62.0 to 64.0, f2=[Mn]/[Ni]=0.49 to 0.68, and f3=[Ni]+[Mn]=13.0 to 15.5 among a content [Cu] mass % of Cu, a content [Ni] mass % of Ni, and a content [Mn] mass % of Mn, and has a metal structure in which (3 phases at an area ratio of 2 to 17% are dispersed in an α-phase matrix.