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Technical Discussions
Kåre Johansson
Kåre Johansson
00:08 Dec-13-2000
Ferrite meassurement of tube/tubesheet welds

One of our contractors wants to verify the ferrite meassurements of duplex stainless steel tube to tubesheet welds using magnetic ferrite meassurements. Does anyone have experience with this type of meassurements or have an opinion on what correction factors will have to be applied to the meassured value? The material is 1.4462, UNS S31803. We are agreeing on hte metallographic tests to be done on the welding procedure and that we will be taking magnetic meassurements on the welding procedure, but this does not give us enough data to be able to set limits we can confidently work with in the shop.


 
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Danny Wang
Engineering
Spectrum Inspection Engineering, PE, USA, Joined May 2000, 2

Danny Wang

Engineering
Spectrum Inspection Engineering, PE,
USA,
Joined May 2000
2
06:29 Dec-13-2000
Re: Ferrite meassurement of tube/tubesheet welds



 
 Reply 
 
rajeev chaudhari
NDT Inspector
offshore testing & inspection services (I) pvt ltd, India, Joined Dec 2000, 17

rajeev chaudhari

NDT Inspector
offshore testing & inspection services (I) pvt ltd,
India,
Joined Dec 2000
17
09:29 Dec-15-2000
Re: Ferrite meassurement of tube/tubesheet welds
Regarding your requirement. we have the instrument which can measure ferrite of duplex stainless steel material. The instrument is handy. Calibration blocks available for 3.2, 8, 36, 100 % ferrite content.
The job can be performed within short period.
should you require any clarrification, please revert back.
please contact:
Offshore Testing & Inspection services (I) pvt. Ltd.
W-147, MIDC Pawane, Thane Belapur Road,
Navi Mumbai 400 703 INDIA
Tel: +91 22 7670874
+91 22 7681946
Fax: +91 22 7633982
+91 22 5561249
email: otislab@vsnl.net
ohcs@giasbm01.vsnl.net.in

: One of our contractors wants to verify the ferrite meassurements of duplex stainless steel tube to tubesheet welds using magnetic ferrite meassurements. Does anyone have experience with this type of meassurements or have an opinion on what correction factors will have to be applied to the meassured value? The material is 1.4462, UNS S31803. We are agreeing on hte metallographic tests to be done on the welding procedure and that we will be taking magnetic meassurements on the welding procedure, but this does not give us enough data to be able to set limits we can confidently work with in the shop.




 
 Reply 
 
Rainer Meier
R & D
retired from intelligeNDT Systems & Services, Germany, Joined Nov 1998, 15

Rainer Meier

R & D
retired from intelligeNDT Systems & Services,
Germany,
Joined Nov 1998
15
09:35 Dec-15-2000
Re: Ferrite meassurement of tube/tubesheet welds
: One of our contractors wants to verify the ferrite meassurements of duplex stainless steel tube to tubesheet welds using magnetic ferrite meassurements. Does anyone have experience with this type of meassurements or have an opinion on what correction factors will have to be applied to the meassured value? The material is 1.4462, UNS S31803. We are agreeing on hte metallographic tests to be done on the welding procedure and that we will be taking magnetic meassurements on the welding procedure, but this does not give us enough data to be able to set limits we can confidently work with in the shop.

The most reliable measurement of the ferrite content in ss duplex steels for our opinion
is done by metallography.The evaluation of the ferrite content by magnetic measurements
is affected by

-The poor sensitivity of comercial available ferrite gauges (e.g. Förster probe)at high
ferrite contents (approx.>30%)

-The ferromagnetic properties of the ferrite phase, which will vary depending on the
chemical composition of the material, the heat treatment, and the welding heat affection.

Nevertheless, a special eddy current sensor, adjusted for high ferrite contents, and
individually calibrated with the procedure/work test piece, should allow for a satisfiing
measurement of the ferrite content of the component.

Rainer


 
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