Ferrite Testing

Ferrite testing is an NDT method used to determine the ferrite content in austenitic and duplex stainless steels. The ferrite number (FN) and/ or ferrite percent (Fe%) are normally determined in welding procedures as a control of material corrosion susceptibility, mechanical properties, service suitability, and reliability. It must be noted that there is a difference between the unit measurement of ferrite number and ferrite percent. The Schaeffler and Delong Diagram may be referred to as a reference only.