COPPER ALLOY WITH A GOLDEN VISUAL APPEARANCE

摘要

There is provided a copper-base alloy useful for coinage that has a golden visual apperance. The material has a transverse electrical conductivity substantially similar to that of copper alloy C713 and when clad to a copper alloy C110 core, a transverse electrical conductivity substantially similar to both sides of a Susan B. Anthony United States dollar coin. The copper-base alloy is a copper-manganese-zinc-nickel alloy consisting for example by weight of 10-15 % Zn, 7-12 % Mn, 2-6 % Ni or 10-14 % Zn, 5-10 % Mn, 2-6 % Ni, optionally controlled contents of Cr, Al, Fe, P, the balance being Cu with inevitable impurities.