Abstract: This paper presents the possibility of making nodular graphite cast ironbyinjection of rare earth alloys instead of magnesium as nodularizer to themolten iron with different sulfur content.Rare earths are as excellent no- dularizers as magnesium, since the injection method has improved the kinetic conditions of the nodularizing reaction. The range of rare earth residue in nodular graphite cast iron and the treatment method for different nodula-rizers are discussed preliminarily in this paper.It is proposed that injection is a suitable method for producing rare earth nodular graphite cast iron.