Why isn’t 316L used in top-reduction condensers?
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Why is duplex steel used instead of 316L in reduced-pressure condensers? Please give me some advice!
316L provides some resistance to high-temperature naphthenic acid corrosion, and is generally used in pipelines downstream of pressure reduction units； Top reduction is usually caused by sulfur corrosion, and using duplex steel can help reduce this corrosion.
Okay, thanks for letting me know. Are there any other reasons?
316L is generally used to resist corrosion caused by high-temperature H2S and naphthenic acids, while corrosion due to low-temperature H2S + HCl requires the use of materials other than 316L; using 316L in such cases would lead to chloride-induced corrosion, which is why duplex steel is used instead.