Ductile iron gears are generally treated without heat treatment
Certainly. At the very least, the casting must be annealed and other heat treatment according to the requirement of use
Heat treatment must be necessary, generally annealed first to machine, after quenching or nitriding treatment
The mechanical properties of ductile iron are equivalent to quenched and tempered steel. The gears made of ductile iron can be quenched or tempered by high temperature + surface quenching, that is, quenching and tempering treatment + surface hardening.
