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Technical Discussions
Freddy Harmon
Freddy Harmon
16:43 Jan-25-2018
How to determine if coarse grain in piping

Trying to find out how to determine if a material such as stainless steel is coarse grain or fine grain.

    
 
 
Diego
Consultant,
Freelance, Spain, Joined May 2013, 188

Diego

Consultant,
Freelance,
Spain,
Joined May 2013
188
17:19 Jan-25-2018
Re: How to determine if coarse grain in piping
In Reply to Freddy Harmon at 16:43 Jan-25-2018 (Opening).

Through metallography

    
 
 
Andrew Robinson
Sales,
PH Tool Reference Standards, USA, Joined Feb 2012, 4

Andrew Robinson

Sales,
PH Tool Reference Standards,
USA,
Joined Feb 2012
4
19:03 Jan-25-2018
Re: How to determine if coarse grain in piping
In Reply to Freddy Harmon at 16:43 Jan-25-2018 (Opening).

Metallography is the best way, but If you have the Material Test Report from the producing mill, the actual grain size is often listed within. That would be the first place to start, and is completely non-invasive!

I believe it is also possible to determine coarse vs. fine-grain by ultrasonic testing. Determination of the grain size is based on factors such as the attenuation coefficient and acoustic velocity. It certainly wouldn't be as empirical as a metallograph, though; just a way to roughly sort coarse vs. fine.

    
 
 

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