本文简述了研制单体铸造稀土球铁活塞环的关健问题。试验并分析了稀土对轴向缩松、石墨球数、球径,碳化物数量的影响;分析了采用钒钛生铁生产活塞环时,稀土与钒钛的相互作用;讨论了铁水温度的影响,为稳定生产单体铸造稀土球铁环提供了参考依据。 This article briefly describes the key issues in the development of single-cast rare earth ductile iron piston rings. The effects of rare earth on the axial shrinkage, the number of graphite balls, the diameter of balls and the amount of carbides were tested and analyzed. The interaction between rare earth and vanadium-titanium was analyzed when the piston ring was produced by vanadium-titanium pig iron. It provides a reference for stable production of rare earth iron rings.