Stainless Steel containing NaCl solution
Stainless Steel containing NaCl solution
(OP)
Hello,
We have an application at our plant that calls for storage of a product solution that is 18% NaCl at temps up to 70 deg C. Our existing 304L and 316L storage Tanks are exhibiting alot of pitting corrosion. Any thoughts on a good stainless alloy to look at for this application, possibly a duplex? Any good reference sites for corrosion info with stainless would also be appreciated.
We have an application at our plant that calls for storage of a product solution that is 18% NaCl at temps up to 70 deg C. Our existing 304L and 316L storage Tanks are exhibiting alot of pitting corrosion. Any thoughts on a good stainless alloy to look at for this application, possibly a duplex? Any good reference sites for corrosion info with stainless would also be appreciated.





RE: Stainless Steel containing NaCl solution
You need a PRE ( pitting resistance number) of more then 40 where PRE= %Chromium+ 3.3x%molybdenum + 16x%nitrogen.
The commercial duplex which satisfies this is 2507 ( uns S32750 ). A super austenitic which satisfies the criterion is AL6XN.
Contact Allegheny Ludlum or Avesta/Sheffield for tecnical help. They have interactive web sites.
RE: Stainless Steel containing NaCl solution
RE: Stainless Steel containing NaCl solution
RE: Stainless Steel containing NaCl solution
RE: Stainless Steel containing NaCl solution
You could also consider cathodically protecting the tank - this is common in pulp and paper mills to prevent pitting and crevice corrosion of stainless steels.
RE: Stainless Steel containing NaCl solution
RE: Stainless Steel containing NaCl solution