Stainless steels are often used for their corrosion resistance in severe environments that contains high CO2 or H2S content, O2 corrosion, acidic media etc.
However, stainless steels are not completely immune and have some limitations, particularly in marine environment where they can face pitting corrosion and be susceptible to chloride stress corrosion cracking.
There are many types of Stainless Steel, and we often see products in SS316 or SS304 sold for marine application.
Both have poor performance in marine environment and atmosphere.
SS304 has a very limited corrosion resistance in sea water and in marine atmosphere.
SS316 is just slightly better but cannot be considered corrosion proof.
Both of them shall be painted and protected by cathodic protection if immersed in seawater.
If you want some strong corrosion resistance properties in such environments, use duplex or super duplex stainless steels.
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