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Industrial processing and chemical plants work at high temperatures and pressures, often with aggressive media; stainless steel is often the material of choice for these applications. If the ferrite content of the steel steel is too low, then welding of stainless material may crack at elevated temperature or with high stress or vibration. If the ferrite content is too high, the weld may be weaker and corrode.


Ferrite meter MF300Fe+

MF300Fe+ manual

Ferrite meter - measures Ferrite Number of stainless steels

To address the need to measure the amount of ferrite in a sample the Welding Research Council introduced the Ferrite Number (FN) as standardised value which related to the ferrite content of an equivalently magnetic weld metal. The volume percentage of ferrite is estimated using a piecewise linear model for typical steels. The relationship depends upon the type and origin of the stainless steel used and the measurement technique.

The Diverse Ferrite meter MF300Fe+ measures the Ferrite number (FN) of austenitic and duplex stainless steel weld material. There are 2 probe options: P46 with an active area of 4x6mm and P10 that is sensitive to ferrite content in a 10 mm diameter.  Depth sensitivity of approximately 1 mm. The P10 probe is also available with air cooling for hot samples. The instrument is calibrated using NIST secondary weld standards. All 16 standards are used in the calibration giving an instrument with a measurement range from 0 to 115 FN. Transfer standards are supplied with the instrument allowing performance to be verified at any time.

Features of MF300Fe+ Ferrite Meter

  • NDT of the ferrite content in a range of 0.1 to 115FN equivalent to 0.1 to 83% Fe in austenitic & duplex steel.
  • Robust and portable
  • Standard or peak measurement of Ferrite Number
  • Piecewise estimate of ferrite percentage
  • Automatic zero on demand
  • Supplied with 5 transfer standards allowing veracity of instrument to be checked
  • Storage of 1000 measurements, downloaded to PC with RS232/USB option
  • 10mm dia (P10) and 4x6mm (P46) probe options
  • Use with high temperature samples (air-cooled probe option)
  • Simple measurement with small sample area.
  • Units selectable between WRC-FN and %Fe.
  • Calibration with standards traceable to NIST standards
  • Supplied in carry case
Ferrite meter air cooled probeFerrite meter air cooled probe