| 摘要 |
Copper alloy for a white coin controlled conductivity is provided to minimize the occurrence possibility of the dummy coinage and forgery to the confirmation of the electric conduction is given to the reinforcement of abrasion resistance and fixation condition. Copper alloy for a white coin controlled conductivity comprises nickel(Ni) 20~30 weight as 100 weight% and rest is consist of coper(Cu) and the inevitable impurity, the conductivity of an end product is the range of 5.2 <= EC(%IACS)<=6.1. A method of manufacturing a white coin is melting and casting an ingot, and which becomes are hot-rolled to very and composition obtains the board material of the constant thickness, cold rolls without the intermediate annealing thermal process and 0.8~1.5mm thickness is obtained, and the conductivity of the end-product is controlled at range of 5.2 <= EC (%IACS) <=6.1. |
