Ferrite Testing
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.

To perform properly ferrite testing, both a minimum material thickness and a minimum specimen size are required. 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.

Southern Inspection applied Ferrite Testing to inspect:

1.   Austenitic stainless steel/Duplex stainless steels
  • Welds (tubing, etc.)
  • Normal construction steel with Austenitic chrome alloy steel welded cladding (Ex. Boilers, vessels, etc.)
2.   Weldments, Castings, Forgings, Weld Overlays, Wrought materials

3.   Weld materials
  • Butt/fillet welds
  • Category A-D welds
  • Stainless weld overlays on non-ferrous interfaces
4.   In-service and in-construction components

ADVANTAGES
  • Rapid and accurate analysis
  • Highly portable digital technology
  • Variable calibration in both Ferrite Number (FN) and % Ferrite (FN) using AWS Standards
  • Testing instrument meets all requirements of ANSI/AWS A4.2 and DIN EN ISO 8249
  • Calibration is traceable to internationally approved IIW secondary calibration standards

LIMITATIONS
  • Not recommended where the material is at temperatures greater than approximately 125F
  • Surface preparation is very important for result accuracy
  • Both a minimum material thickness and a minimum specimen size are required
  • Shape of the specimen may have a negative effect on the results obtained. Correction calculations can be performed in some instances.

   

 

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