介绍了用Ti代替Mo生产的491Q灰铸铁凸轮轴的生产工艺、显微组织和性能特征。实践证明:在熔炼过程中添加适量的V-Ti生铁,可以生产出φ30mm试棒抗拉强度高于300MPa的灰铸铁凸轮轴;凸轮轴中的石墨变成D型,基体组织为片间距约100nm、硬度约300HV的屈氏体;批量生产没有出现因降低w(Mo)量而产生早期失效的产品。 The production technology, microstructure and properties of 491Q gray cast iron camshaft with Ti instead of Mo were introduced. Practice has proved that: adding proper amount of V-Ti pig iron in the smelting process can produce gray cast iron camshaft with φ30mm test bar tensile strength higher than 300MPa; the graphite in the camshaft becomes D type, the matrix structure is chip spacing about 100nm , Troostite with a hardness of about 300 HV; there was no mass production of products with early failure due to the reduction of the amount of w (Mo).