研究了微量铅对灰铸铁石墨形态、基体组织、机械性能以及铸造性能的影响。结果表明，铅显著影响铸铁石墨形态，导致机械性能的恶化，铸铁中铅含量应控制在０ ．００５ ％ 以下。 The effects of trace lead on the morphology, matrix structure, mechanical properties and casting properties of gray cast iron were investigated. The results show that lead significantly affects the morphology of cast iron and graphite, leading to the deterioration of mechanical properties. The lead content in cast iron should be controlled at zero. 005% the following.