Abstract
By adding fluorspar to molten iron, the cast iron having spheroidal or globular form of graphite and having high ductility was obtained. The cast iron added 5.0% fluorspar have shown good mechanical properties, for instance, tensile strength of 37.6 kg/mm2 and elongation of 8.0% as cast. The suitable pig iron for this treatment was the iron of composition above S. C. I. I. or high silicon pig iron. To obtain the excellent mechanical properties, the amount of fluorspar as much as 5.0% is needed and high temperature must be maintained at the period of addition.
