Coin blank for manufacturing coin, comprises core made of ferrous material, which has cover layer made of nickel provided close to surface of finely dispersed copper doping

摘要

The coin blank comprises core made of ferrous material (1), which has cover layer (2) made of nickel provided close to surface of finely dispersed copper doping (3). The penetration depth of copper doping is 0.5 to 10 microns. The cover layer is doped with copper and/or silver.