Austempered Ductile Cast Iron (ADI) has emerged as a major engineering material in recent years because of its excellent mechanical properties. These include high strength with good ductility, good wear resistance and fatigue strength. It is therefore considered as an economical substitute for wrought or forged steel in several structural applications especially in the automotive industry. In this investigation, a low manganese nodular cast iron with predominantly pearlitic as-cast structure was processed by a novel two-step austempering process. The microstructure and the mechanical properties of this ADI (processed by two-step austempering process) was characterized.