This information sheet gives the background and basic guidelines to consider the feasibility of austempered
ductile iron (ADI) for gear applications. It contains experimental, experiential and anecdotal information to as-
sist in the specification, purchase and manufacture of ADI components. The metallurgy of ADI, the relevant
factors in its production, allowable stress numbers, and stress cycle curves are reviewed. It also has refer-
ences, relevant standards, and evaluation methods used in the manufacture of ADI components.