When Is Ferrite Testing Required?

Ferrite testing is sometimes necessary to avoid material failure in duplex and austenitic stainless steels. A ferrite content that is too high or too low can be detrimental. If the ferrite content is too low, then the stainless steel may be susceptible to solidification cracking (hot cracking) upon welding.

How do you check ferrite content?

The Feritscope FMP30 measures according to the magnetic induction method. A magnetic field generated by a coil enters into interaction with the magnetic components of the specimen. The changes in the magnetic field induce a voltage proportional to the ferrite content in a second coil. This voltage is then evaluated.

What is ferrite count?

Ferrite content is a measure of the amount of ferrite in a steel. Ferrite is one form of microstructure – the internal crystal structure – that can exist within steel. ... A ferritic microstructure in a stainless steel is usually associated with high strength and resistance to chloride stress corrosion cracking.