Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

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
Available for download
Product Number: 51321-16772-SG
Author: Nozomi Satake; Mikihiro Sakata
Publication Date: 2021
$0.00
$20.00
$20.00

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.

Product tags
Also Purchased
Picture for Ferrite Measurement in Duplex Stainless Steels
Available for download

Ferrite Measurement in Duplex Stainless Steels

Product Number: 51319-13437-SG
Author: Kasra Sotoudeh
Publication Date: 2019
$20.00

Duplex stainless steels typically contain 50% austenite and 50% ferrite. Phase balance is important in duplex stainless steels as it helps to impart optimum mechanical properties and corrosion resistance. Welding may alter the phase balance and so it is necessary to assure that phase balance is still within acceptable ranges. Ferrite measurement practice will be reviewed in terms of existing established techniques and recent advances in materials characterisation tools. Measurement precision and accuracy will be discussed.
Picture for Study on Ferrite Measurement Methods for Duplex Stainless Steel Welds
Available for download

51318-10634-Study on Ferrite Measurement Methods for Duplex Stainless Steel Welds

Product Number: 51318-10634-SG
Author: Nozomi Satake / Mikihiro Sakata / Tomoaki Kiso / Toshiaki Okabe /
Publication Date: 2018
$20.00

Ferrite measurements are used during welding procedures on duplex stainless steel. We studied the effects on the measured ferrite contents of (1) grid size, (2) number of fields and (3) measurement locations.

 
Picture for The Detection Of Alpha Prime In Duplex Stainless Steels
Available for download

51316-7025-The Detection Of Alpha Prime In Duplex Stainless Steels

Product Number: 51316-7025-SG
ISBN: 7025 2016 CP
Author: Roger Francis
Publication Date: 2016
$20.00

 The alloys (used in chem/process industries) are usually in the solution annealed condition & must be fast cooled from the annealing temperature to prevent the precipitation of third phases such as sigma chi nitrides & alpha prime. This paper describes a reactivation test to detect alpha prime - used with 22%Cr and 25% Cr alloys. Case studies.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support