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自古以来,世界各国的流通硬币(尤其是辅币),大多采用铜作为基本金属材料。不管是青铜币、黄铜币还是铜镍合金币, 都离不开铜。同时,由于铜本身的良好性能,作为特殊的战争材料,又广泛用于制造枪炮子弹等军工产品。战争时期,特别是世界大战时,这种重要的军工材料更为各国官方严格控制,以免流入敌方。对于用量巨大的流通硬币生产,很多国家则采用其它材料(如铝、铁和锌等)作为辅币的替代材料。
Since ancient times, circulating coins in various countries in the world (especially coinage) have mostly used copper as the basic metal material. Whether it is bronze coins, brass coins or copper-nickel alloy coins, are inseparable from the copper. At the same time, due to the good performance of copper itself, it is also used as a special war material in military products such as guns and ammunition. During the war, especially during the world wars, this important military material was more strictly controlled by the official countries so as not to infiltrate the enemy. For large volume coins, many countries use alternative materials such as aluminum, iron and zinc as alternative coins.