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Technical Discussions
farabirazy
farabirazy
06:05 Nov-29-2008
Urgent- ToFD for Steam Reformer Tube

Dear Gentlemen,

Does anyone ever involve in research of ToFD for Cast austenitic stainless steel used as ammonia reformer tube? I tried to detect artificial defect in IN 519 material, but I can not distinguish the backwall signal. Can anyone explain why and what should I do to detect the defect in this material by using ToFD? As FYI, I used 2.25 MHz ToFD transducer. Is there any commercial ToFD transducer with frequency below 2.25 MHz?

Please help me...

Sincerely Yours,

Abi


    
 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 829

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
829
00:10 Nov-30-2008
Re: Urgent- ToFD for Steam Reformer Tube
Abi,

The frequency you are using is too high. ASTM A388 para 8.2.1 states that the prefered frequency for coarse grain austenitic materials is 1 MHz and that in many instances it may be necessary to use a frequency of 0.4 MHz. I know that ASTM A388 is for Ultrasonic Examination of Heavy Steel Forgings, but the reason for freqyency selection doesn't change. You are dealing with a very coarse grain structure and you need to lower your frequency..

Hope this will help.

Cheerio's
Michel

----------- Start Original Message -----------
: Dear Gentlemen,
: Does anyone ever involve in research of ToFD for Cast austenitic stainless steel used as ammonia reformer tube? I tried to detect artificial defect in IN 519 material, but I can not distinguish the backwall signal. Can anyone explain why and what should I do to detect the defect in this material by using ToFD? As FYI, I used 2.25 MHz ToFD transducer. Is there any commercial ToFD transducer with frequency below 2.25 MHz?
: Please help me...
: Sincerely Yours,
: Abi
------------ End Original Message ------------




    
 
 
Ed T.
Ed T.
09:53 Dec-02-2008
Re: Urgent- ToFD for Steam Reformer Tube
----------- Start Original Message -----------
: Abi,
: The frequency you are using is too high. ASTM A388 para 8.2.1 states that the prefered frequency for coarse grain austenitic materials is 1 MHz and that in many instances it may be necessary to use a frequency of 0.4 MHz. I know that ASTM A388 is for Ultrasonic Examination of Heavy Steel Forgings, but the reason for freqyency selection doesn't change. You are dealing with a very coarse grain structure and you need to lower your frequency..
: Hope this will help.
: Cheerio's
: Michel
: : Dear Gentlemen,
: : Does anyone ever involve in research of ToFD for Cast austenitic stainless steel used as ammonia reformer tube? I tried to detect artificial defect in IN 519 material, but I can not distinguish the backwall signal. Can anyone explain why and what should I do to detect the defect in this material by using ToFD? As FYI, I used 2.25 MHz ToFD transducer. Is there any commercial ToFD transducer with frequency below 2.25 MHz?
: :Please help me...
: : Sincerely Yours,
: : Abi
------------ End Original Message ------------
Michel is correct. You need to use a 1.0 MHz. Ducer. But it also needs to be a dual focused probe focused for the thickness you are examining with a refracted longitudinal wave mode..
But it can be done.
I would also recomend the use of a UT scope with a strong pulser. That material is tough and some of the grains can be as big as your calibraton reflectors.




    
 
 
jaidev
jaidev
13:21 Nov-23-2012
Re: Urgent- ToFD for Steam Reformer Tube
In Reply to farabirazy at 06:05 Nov-29-2008 (Opening).

any success using 1MHz probe

    
 
 

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