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Page 12
03/2018
Ferrite percentage
Ferrite Percentage
Calibration standards exist for ferrite number (FN) and the is
calibrated using secondary ferrite number standards supplied by NIST.
The volume percentage of ferrite can be estimated roughly as about
70% of the FN particularly at higher FN (ref 1). However, the
relationship depends upon the type and origin of the stainless steel
used and the measurement technique.
measures FN but can display ferrite percentage (toggle
between display modes using a long press on the
�
up key). Ferrite %
(y-axis) is calculated from FN (x-axis) using the following conversion
curve (ref 2).
.
Using the results of measurements on reference standards the
conversion relationship shown was determined. The measurement
converted to point count ferrite shows an uncertainty of ±16% of the
measurement (indicated by the grey area above and below the
conversion curve).
Ref. 1 with software versions prior to 271117 use 0.7xFN for ferrite percentage
Ref. 2 Operating Manual FERITSCOPE MP30 (2.0 - 12/01)
