Dear Dr. Kumesh Sonawane ,

there are concerns about galvanic corrosion when duplex stainless steels are in contact, in the presence of humidity, with other metals such as stainless steel, carbon steel, galvanized steel, copper and brass. However, duplex stainless steel is not typically attacked in this way since it is usually the most noble material in the galvanic couple. Of course, the corrosive environment and the differences in material areas play a fundamental role.

Galvanic corrosion of the less noble material can usually be prevented with proper design and by electrically insulating dissimilar metals.

To learn more about the topic, I suggest you to have a look at the following sources:

-Practical guide to using duplex stainless steels

A GUIDE TO THE USE OF NICKEL-CONTAINING ALLOY

(10044)

by Nickel Institute (Second Edition Published 2020)

Available at: https://nickelinstitute.org/media/8dab1e8a1825480/nickelpub10044_apracticalguidetousingduplex.pdf

and

-Building sustainable marine structures with duplex stainless steel

By outokumpu (2023)

Available at: https://www.outokumpu.com/en/expertise/2023/building-sustainable-marine-structures-with-duplex-stainless-steel

Enjoy reading and my best regards, Pierluigi Traverso.

Not be major problem

It important to ensure that the material are compatible and have Mechanical properties to prevent any galvanic corrosion

Kumesh

You would not have any problem with such joints in humidity at room temperature.

Dr.K

Only a problem if the environment might be able to cause corrosion in the stainless steel flange. Take care of crevice corrosion.

I see no problem at room temperature and good relative humidity

Ted, let me know where you are going to use the assembly of SS with the Duplex SS. Also which SS, you are using with the Duplex? if possible send me the photo or drawing of the assembly.

Dr. K