What is ADI (Austempered Ductile Iron) ?
ADI is a cast iron material in which the carbon appears as nodules and the structure matrix consists of ausferrite. This ausferrite is a fine-grained mixture of ferrite and stabilised austenite which is a guarantee for the high hardness and ductility of ADI.In ADI the chemical composition is laid down according to the relevant wall thickness of the material. In general it is aimed to achieve the following analysis::
| C [%] | Si [%] | Cu [%] | Ni [%] | Mo [%] |
| 3,5 – 3,7 | 1,9 – 2,3 | 0,6 – 1,0 | 0,6 – 2,5 | 0,15 – 0,3 |
With this composition, and depending on the form which the metallic matrix has, the material has an expected tensile strength of Rm = 800 to 1400 N/mm².
ADI is an alloyed form of spheroidal cast iron, in combination with a special form of heat treatment.