FERRITE TESTING

Ferrite content analysis provides critical data pertaining to delta ferrite content in 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 reliability.

Ferrite testing is performed on austenitic stainless steel and duplex items, including (but not limited to) weldments, castings, weld overlays, wrought materials, and forgings. Ferrite content analysis can be obtained on butt/fillet welds, Category A-D welds, stainless weld overlays on non-ferrous interfaces, cast components, and pre- and post-weld heat-treated components.

Ferrite testing, utilizing portable digital technology with variable calibration in both Ferrite Number (FN) and % Ferrite (FN) using AWS standards, allows for rapid and accurate analysis. Both in-service and in-construction components are tested.

To perform properly ferrite testing, both a minimum material thickness and a minimum specimen size are required. The shape of the specimen may have a negative effect on the results obtained, although correction calculations can be performed in some instances. Surface preparation is very important to ensure result accuracy. Ferrite testing is not recommended where the material is at temperatures greater than approximately 125° F.

Test results are interpreted in accordance with current specifications and/or customer requirements. Reports issued are accompanied when necessary by drawings to identify locations tested.