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 (一)中国铅锭牌号及化学成分见表3-1。表3-1铅锭牌号及化学成分牌号化学成分(质量分数)/%标准号Pb(不小于)AgCuBiAssbSnZnFe杂质总和Pb99.99499.9940.0050.0010.0030.00050.0010.0010.00050.00050.06GB/T469-1995Pb99.9999.990.0010.00150.0050.0010.0010.0010.0010.0010.01Pb99 (共 7655 字) [阅读本文] >>