410s and 304 tray

[sw007]

We are designing a Caustic Tower with 18% caustic solution and 1000ppm H2S, Cl less than 50ppm. Which materials is better for the metallurgy of trays? Our previous seletion is 410S. I am thinking the reason for the seletion of 410s.

How to evaluate the corrosion rate for these two materials at caustic and H2S condition?

please advice. thanks.

 

[metengr]

Best information if you can is to run test coupons of 304 and 410 in-situ if you have an existing tower in service.

 

[EdStainless]

I would be thinking about using 410 or a real ferritic, such as low carbon 430. I wouldn't see 304 as a good alternative.

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