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- since 1996 -
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Technical Discussions
Steven Prince
Steven Prince
05:16 Mar-22-2001
Testing Hot Metals

Dear Fellow Practitioners,

I would appreciate hearing from anybody that has had practical experience in detecting imbedded flaws within ferritic steel at temperatures of approximately 500 degrees Celcius.

The flaws would be approximately 200mm below the scanning surface.

Could EMATs or air-coupled ultrasonics provide the answer?

Thank you in antacipation of a response,

Steve Prince.


    
 
 Reply 
 
Steven Prince
Steven Prince
05:20 Mar-22-2001
Re: Testing Hot Metals
I have just read the message that I posted earlier and have detected a typing error.

The flaws are 20mm (not 200mm) below the surface.

Please accept my apologies.

Steve Prince



    
 
 Reply 
 
Jean Paul van Cuyck
Director
A2MS, Applied Acoustics, Materials and Systems, France, Joined Nov 1998, 13

Jean Paul van Cuyck

Director
A2MS, Applied Acoustics, Materials and Systems,
France,
Joined Nov 1998
13
01:12 Mar-22-2001
Re: Testing Hot Metals
: I have just read the message that I posted earlier and have detected a typing error.
.
: The flaws are 20mm (not 200mm) below the surface.
.
: Please accept my apologies.
.
: Steve Prince
.
It exist quartz temperature intreface. The system
could be refresh. And the length of the interface
depend on the température difference needed and the
ultrasonic wave length.

This is a contact technology. Perhaps you absolutly
need a non contact technology?



    
 
 Reply 
 
Joseph Pascente
Engineering
Lixi, Inc., USA, Joined Nov 1998, 39

Joseph Pascente

Engineering
Lixi, Inc.,
USA,
Joined Nov 1998
39
06:19 Mar-22-2001
Testing Hot Metals
Lixi's Profiler with graphite heat shield will find
20mm voids in 120mm thick steel plates.


    
 
 Reply 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 278

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
278
01:40 Mar-23-2001
Re: Testing Hot Metals
EMAT have been used in these temperature ranges successfully. Problem is always one of sensitivity. At these defect sizes that should not be a problem if you want to simply detect them. If you want to size growth of the defects over a period of time that may be a problem.

IHI Southwest have been doing some work in the Hydrocarbon process industry with a portable EMAT device you could try them.

There are also a number of EMAT specialist companies in Germany, and Canada.


    
 
 Reply 
 
Jan Verkooijen
Director,
Sonovation, Netherlands, Joined Nov 1998, 29

Jan Verkooijen

Director,
Sonovation,
Netherlands,
Joined Nov 1998
29
05:28 Mar-23-2001
Re: Testing Hot Metals

: Lixi's Profiler with graphite heat shield will find
: 20mm voids in 120mm thick steel plates.
.
Sonovation have developed a method to inspect thick welds
at temperatures of over 400 degrees Celcius. We have
validated the method for test pieces of 240/180 mm of
steel, whereby we could find an EDM notch of 3 mm deep
at 500 degrees C. For smaller defects we can reliably do
the inspection at some 430 degrees C. We have applied the
method in practice for initial and repeat inspections
now. Safety was an important issue here and we have
set up a separate procedure for working under these
conditions, which should not be underestimated.

Jan Verkooijen



    
 
 Reply 
 

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