Sulfuric acid-resistant heat exchanger
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I’m seeking advice from experts regarding the rental of heat exchangers for the process of concentrating and recovering waste acid. Previously, heat exchangers made of 316L material were used; the acid concentration was 50%, and the temperature was around 60°. These heat exchangers corroded after just a few months of use. Now I want to switch to heat exchangers made of other materials – 904L, Hastelloy C276, Hastelloy B2, Hastelloy C22, and 20 alloy. Which of these stainless steel materials is suitable for my application? If anyone knows, please let me know; I would be very grateful
Graphite heat exchangers are recommended. Graphite heat exchangers can be used for a long time at the boiling point of sulfuric acid at 75% concentration without any signs of corrosion.
The medium is sulfuric acid; 904L will suffice
Check relevant information: HAS.B and HAS.C are not ideal at the critical point. 904L = Sandvik 2RK65; according to the Sandvik website, its corrosion resistance rating is level 2 (not recommended for use). -------------------------- Look more, listen more, compare more, and think more – then you will find the most suitable option
This post was last edited by Wang Genrong on 2018-12-21 at 15:33; graphite is the preferred choice.
The acid concentration is 50%, and the temperature is around 60° – this is dilute sulfuric acid. It is not suitable for ordinary carbon steel or stainless steel; graphite or HC can be tried instead
I agree with you; under these operating conditions, graphite material is the preferred choice.