Patent ID: 9512507
Filing Date: 2016-12-06
CPC Classification: C22C,C22F

Claim Text:
1. A silver-white copper alloy having superior color fastness and bactericidal property, the silver-white copper alloy comprising: 51.0 mass % to 57.0 mass % of Cu; 9.0 mass % to 12.5 mass % of Ni; 0.05 mass % to 0.9 mass % of Mn; 0.0003 mass % to 0.010 mass % of C; 0.0005 mass % to 0.030 mass % of Pb; and the balance of Zn and inevitable impurities, wherein a relationship of 65.5≦[Cu]+1.2×[Ni]+0.4×[Mn]≦69.0 is satisfied between a content of Cu [Cu] (mass %), a content of Ni [Ni] (mass %), and a content of Mn [Mn] (mass %), a relationship of 0.58≦[Zn]/[Cu]<0.7 is satisfied between a content of Zn [Zn] (mass %) and the content of Cu [Cu] (mass %), and in a metal structure thereof, an area ratio of β phases dispersed in an α-phase matrix is 0% to 0.9%.