| 摘要 |
The present invention relates to a manufacturing method of uncirculated (UNC) precious metal products which can reduce production cost. The manufacturing method of UNC precious metal products comprises: a preparing step of preparing a precious metal ingot; a rolling step of rolling the precious metal ingot; a punching step of cutting the precious metal ingot in a predetermined shape and size; a weight control step of controlling the precious metal ingot by desired weight; an annealing step of heating the precious metal ingot; and a washing step of washing the precious metal ingot. |
