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What is ADI?

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ADI is an acronym for Austempered Ductile Iron. This material is produced by applying an austempering heat treatment to a suitably alloyed ductile iron. This produces a matrix microstructure of fine acicular ferrite and austenite, called ausferrite (see microstructure shown below).

This unique structure gives ADI an outstanding combination of mechanical properties which include very high strength with good ductility, high fatigue strength, good fracture toughness and excellent wear resistance. These properties, together with its lower density and lower production costs, have enabled ADI to replace high cost forged steel, heat-treated steel, fabrications in many applications.
ADI components are used in a variety of industries worldwide, which include: renewables energy; wind and wave, heavy truck and bus; light car and truck; construction and building; agricultural; mining and railways.
Picture showing ADI microstructure
Shown above: ADI microstructure - graphite spheroids in a matrix of ausferrite (a mixture of acicular ferrite and austenite).

Russell Ductile Castings has been supplying ADI components to a our customers for more than 10 years and our technical team has built unrivalled experience and expertise. We provide all the technical support and assistance necessary at the design stage and throughout the development period.
We can supply all the grades of ADI, which conform to American and European Standards, and any special grade specified by the customer, by mutual agreement.
Components can be supplied fully machined and surface coated, if required. Russell Ductile Castings takes full ownership of all process steps to ensure that finished components are delivered ready for use and compliant to specification.
Russell Ductile Castings is now the largest producer of ADI in the UK and has experienced consistent sales growth as customers recognise the numerous benefits of this material.