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Study On Ferrite Measurement Methods For Duplex Stainless Steel, Part 2: Focus On Measurement By Ferrite Scope

Picture for Study On Ferrite Measurement Methods For Duplex Stainless Steel, Part 2: Focus On Measurement By Ferrite Scope
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Product Number: 51321-16772-SG
Author: Nozomi Satake; Mikihiro Sakata
Publication Date: 2021
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When evaluating the ferrite content (%) to assess the quality of industrial products made of duplex stainless steels, two different measurement methods are generally used. One method is a destructive method with metallographic observation to directly determine the volume fraction of ferrite phase (%). The other method is a non-destructive method based on the magnetic properties of ferrite phase which is typically measured with a ferrite scope. Unlike the ferrite measurement by metallographic observation, the ferrite measurement with a ferrite scope cannot determine the volume fraction of ferrite phase (%) directly. Instead, it detects the degree of interaction between magnetic field and ferrite phase and convert it to the volume fractions of ferrite phase (%). Although the ferrite scope is a valuable inspection tool that offers a simple and quick measurement, it has been observed the ferrite content (%) obtained with a ferrite scope is not always equal to the true volume fraction. In the present study, in order to reveal the discrepancy, a round robin test for ferrite scope measurement was conducted by involving institute including industrial NDE companies from around the world who have been regularly assigned in plant construction and maintenance. The test used nine (9) 22% Cr duplex stainless steel samples for which the volume fractions of the ferrite phase had been previously determined by metallographic observation.

When evaluating the ferrite content (%) to assess the quality of industrial products made of duplex stainless steels, two different measurement methods are generally used. One method is a destructive method with metallographic observation to directly determine the volume fraction of ferrite phase (%). The other method is a non-destructive method based on the magnetic properties of ferrite phase which is typically measured with a ferrite scope. Unlike the ferrite measurement by metallographic observation, the ferrite measurement with a ferrite scope cannot determine the volume fraction of ferrite phase (%) directly. Instead, it detects the degree of interaction between magnetic field and ferrite phase and convert it to the volume fractions of ferrite phase (%). Although the ferrite scope is a valuable inspection tool that offers a simple and quick measurement, it has been observed the ferrite content (%) obtained with a ferrite scope is not always equal to the true volume fraction. In the present study, in order to reveal the discrepancy, a round robin test for ferrite scope measurement was conducted by involving institute including industrial NDE companies from around the world who have been regularly assigned in plant construction and maintenance. The test used nine (9) 22% Cr duplex stainless steel samples for which the volume fractions of the ferrite phase had been previously determined by metallographic observation.

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