Machinability is greatly improved compared to sand-cast iron, thanks to its 100% ferritic structure and the extremely fine graphite flakes that reduce cutting efforts.
A CETIM* study reports a gain of +20% of productivity, obtained in feed speed, reduced cutting tools wear and less stoppages for changing tools.
Enhanced water tightness and pression resistance are obtained by the shell stiffness, that counteracts the swelling of cast iron. The graphitic expansion of cast iron is therefore limited and allows an increased compactness of the material. Fine graphite flakes, obtained by fast cooling of cast iron in the shell, avoids a notch effect, thereby improving pression resistance and fatigue.
Excellent surface condition guaranteed by fine graphite flakes, which give to machined surfaces a smooth appearance without wrenching of material. Casting in metal die gives parts a better polishing than sand casting.
*Centre Technique des Industries Mécaniques