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Ferrite Content Measurement (Feritscope)

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PROBE FERRITE DEFICIT WITH MAGNETIC INDUCTION

The importance of ferrite content & why there’s a need for measurement

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Duplex stainless steels are a family of corrosion-resistant alloys. It typically contains 50 % austenite and 50 % ferrite – a phase balance essential in duplex stainless steel. This way helps impart optimum mechanical properties and corrosion resistance. While the austenite phase provides corrosion resistance and impact strength toughness, too much ferrite will reduce toughness. Too little ferrite will reduce the resistance to chloride stress corrosion cracking.

One prime example would be welding. It involves a thermal cycle that may alter the phase balance. It is essential to ensure that phase balance is still within acceptable ranges in the heat-affected zone and weld metal.

Quality control of welded duplex stainless steels usually requires confirmation of an acceptable phase balance by ferrite measurement. Ferrite content measurement can be done on-site via a portable ferrite scope machine. Only an onsite measurement can assure that the processing did not unfavourably change the optimum ferrite content at the expense of mechanical or corrosion-resistance properties.

Ferrite testing verifies whether heat treatment applied to the material has reached the required performance balance.

The delta ferrite content is measured to better understand an austenitic or duplex stainless steel's susceptibility to corrosion, susceptibility to solidification cracking and other types of material failure.

Ferrite testing is sometimes necessary to avoid material failure in duplex and austenitic stainless steels.

The ferrite scope uses induction to measure the magnetic permeability of a material.

WHY DO WE NEED TO MEASURE THE FERRITE CONTENT IN DUPLEX STAINLESS STEEL?

Ferrite testing verifies whether heat treatment applied to the material has reached the required performance balance. Ferrite testing commonly employs magnetic induction to measure the ferrite content of a material, although other methods are used. The delta ferrite content is estimated to better understand an austenitic or duplex stainless steel’s susceptibility to corrosion, susceptibility to solidification cracking and other types of material failure.

Our portable ferrite content measurement technique

PTSPL’s ferrite content measurement via Fischer ferrite scope – a brand widely recognised in the oil and gas industry. An instrument that uses magnetic induction to measure the ferrite content of a material.

In welding, ferrite testing provides a simple yet instant measurement of the ferrite content, especially in the weldment, which can easily assume unfavourable values either due to unsuitable welding filler materials or through poor heat input or heat removal.

Conversely, in duplex stainless steels, the ferrite content will only influence

  • How corrosion-resistant it is
  • Its mechanical properties

Having the right ferrite content in the type of stainless steel that is being worked with will provide the correct balance between:

  • How tough it is
  • How corrosion-resistant it is
  • Its ductility
  • Whether or not it will crack

Case Study :

Client Introduction:

Oil & Gas, welding, maritime

Problem:

Sometimes a customer doesn't know the requirements of the international code, let alone the specifications given by their end user.

Solution:

We'll give a brief run-through of how ferrite scope works by our machine capabilities and then advise them on the specifications before conducting the job. Sometimes the ferrite scope may require the results to be in Ferrite number or ferrite percentage, with different locations for the ferrite spots to be measured.

Review:

- The client's feedback is that sometimes the ferrite scope may deem as unnecessary to be called up, or there are no requirements but just added as an additional test.
- We're pretty transparent in our pricing regarding the number of spots we've been charging, and the client knows that.

Common Test Methods

BS EN ISO 8249

AWS A4.2M

Analyze if the sample is corrosion resistant

Easily determine surface cracks

To check if sample will crack easily

Talk to us today

Our ferrite content testing team ensures that obtained ferrite readings are accurate and can measure Ferrite’s low, medium or high content through complete sets of magnetic induction probes. Contact us today for more information about how we perform ferrite content measurement or request a quote.

process timeline

Process #1
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Process #2
Lorem ipsum dolor sit amet, mea ei viderer probatus consequuntur, sonet vocibus lobortis has ad. Eos erant indoctum an, dictas invidunt est ex, et sea consulatu torquatos. Nostro aperiam petentium eu nam, mel debet urbanitas ad, idque complectitur eu quo. An sea autem dolore dolores.
Process #3
Lorem ipsum dolor sit amet, mea ei viderer probatus consequuntur, sonet vocibus lobortis has ad. Eos erant indoctum an, dictas invidunt est ex, et sea consulatu torquatos. Nostro aperiam petentium eu nam, mel debet urbanitas ad, idque complectitur eu quo. An sea autem dolore dolores.
Process #4
Lorem ipsum dolor sit amet, mea ei viderer probatus consequuntur, sonet vocibus lobortis has ad. Eos erant indoctum an, dictas invidunt est ex, et sea consulatu torquatos. Nostro aperiam petentium eu nam, mel debet urbanitas ad, idque complectitur eu quo. An sea autem dolore dolores.
Process #5
Lorem ipsum dolor sit amet, mea ei viderer probatus consequuntur, sonet vocibus lobortis has ad. Eos erant indoctum an, dictas invidunt est ex, et sea consulatu torquatos. Nostro aperiam petentium eu nam, mel debet urbanitas ad, idque complectitur eu quo. An sea autem dolore dolores.
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