Ferrite testing is a technique used to measure the delta ferrite content in austenitic stainless steel and duplex stainless steel. Ferrite testing is a technique used to measure the delta ferrite content in austenitic stainless steel and duplex stainless steel. … Ferrite testing commonly employs magnetic induction as a means to measure the ferrite content of a material, although there are other methods that are used

The basic 300 series stainless materials like 304/L and 316/L have an austenitic microstructure and are non-magnetic. That is, in the annealed condition they are essentially free of ferrite, which is magnetic.

Ferrite content analysis is a non-destructive testing method which provides critical data for austenitic stainless steel and duplex materials. The delta ferrite percentage or number allows a technical assessment of material corrosion susceptibility, mechanical properties, service suitability, and service reliability.

Ferrite testing is a fast, inexpensive, and accurate way to measure delta ferrite content in austenitic and duplex stainless steels. … A correct ferrite measurement can help to avoid both solidification cracking and corrosion in stainless steel welds, pipes, plates, pressure vessels and petrochemical components.