plating, anodizing, & finishing Q&As since 1989
304SS with H2S
I wish to know if 304SS is compatible with H2S in a normal range of <100 °C. I do not know the actual content nor concentration of H2S in process application. Thank you in advance for your comments.
- London, England
300 series stainless steels are know to stress crack when exposed to sulfides.
Consultant - Poulsbo, Washington
(Don is co-author of "Plating on Plastics" [affil link to the book on: Amazon or AbeBooks ])
It depends upon a lot of things, of course. Is the H2S an impurity or part of the product that you are housing in the 304ss? If it is an impurity it may be possible to put something in the tank to drop out the sulfide as a solid precipitate without affecting your process.
Small concentrations may not be a problem. How long is the process going before you do PM? Is this a tank or vessel of some kind? Make sure it is diked.
Stellar Solutions, Inc.