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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...316L Discoloration316L Discoloration
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5/6/2008 9:00 AM
 
I've had a hard time finding information on the subject, so here's the problem I'm having. I'm annealing some 316L pipes at 550 C under nitrogen, but the 316L is turning from the bright, polished, silvery color to a gray, blue, or sometimes just a yellow color. What could be causing this? My first reaction is oxidation, but since I'm using a fairly pure nitrogen source, I'm not sure where the oxygen could be getting into the system.
 
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10/23/2008 9:00 AM
 
316L discoloration takes place mainly due to oxidation. You must check the nitrogen atmosphere in which you are annealing the SS pipes. Even while welding SS pipes in 99 % pure Ar gas purging decoloration has been observed. This discoloration is also known as "heat tints" which does appear during heat treatment and welding of stainless steel.
 
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HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...316L Discoloration316L Discoloration


  

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