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铅和锑是铜合金中最有害的杂质。含有万分之几这样的杂质是使铸锭在热压时发生破裂的原因。此外,锑会使合金在冷加工时,尤其在制品的深冲时具有脆性,当两种杂质共存於合金中时有害的作用更大。在生产黄铜时由於利用的各种废料和屑料,铅和锑的含量,可达到很大的数目。例如,在亚历山大洛夫和门捷里也夫的箸作中,曾经指出:68黄铜的配料中,废料超过30％时,铅的含量可能达到0.048％,锑的含量,可能达到0.10％。具有这种杂质含量的黄铜铸锭在热压时会产生很深的裂纹,以致使它不可能继续加工。由於缺乏系统的研究这些杂质对黄铜机械性能
Lead and antimony are the most detrimental impurities in copper alloys. Containing a very few such impurities is caused when the ingot rupture occurred in the crack. In addition, antimony makes the alloy brittle during cold working, especially during deep drawing of the article, and is more detrimental when both impurities coexist in the alloy. In the production of brass due to the use of various waste and crumbs, lead and antimony content can reach a large number. For example, in the works of Alexander Love and Mendelievich, it has been pointed out that the content of lead in brass may exceed 0.048% and the content of antimony may reach 0.10% in more than 30% of brass. A brass ingot having such an impurity content generates a deep crack during hot pressing so that it can not be processed any further. Due to the lack of systematic study of these impurities on the brass mechanical properties