Metal finishing Q&As since 1989

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Stainless steel corrosion resistance-drinking water

2007

I am an Engineer for a manufacturer of drinking water filtration systems. We currently use 316 SST pressure vessels. I would like to look at using 304 SST as an alternative. I would also like to increase corrosion resistance. I have been researching electropolishing as a possible surface treatment. Since the application involves drinking water there is chlorine present. Are there more suitable surface treatment?

I would also like to inquire about trade shows for the finishing industry. Can anybody give insight?

Thanks.

John Manocchio
Product Designer - Sparks, Nevada, USA

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2007

John,

I believe 316 SST is more corrosion resistant than 304 SST, especially around chlorides due to the molybdenum in 316 SST. The NASF is presenting SUR/FIN, a major technical/trade show for the surface finishing industry in Cleveland, August,2007.

Regards,

Thomas Kemp
- Erie, Pennsylvania, USA

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2007

John,
In many circumstances, (state of the art) electropolished 304 has a better corrosion resistance than passivated 316.
If your systems operate at ambient temperature, 304 + ep could be an excellent alternative for your 316 constructions.

Marc Quaghebeur
- Brugge, Belgium