What material is good for hydrogen pipelines?
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I have a reactor in which zinc powder and hydrochloric acid are used; the hydrogen ions generated are used for reduction, while any excess hydrogen ions form hydrogen gas that escapes. The reactor is made of enamel, so is it okay to use 304 material for the hydrogen gas venting pipeline?
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Use carbon steel for temperatures below 200 degrees; refer to the Nelson curve for details.
There are reactive ions; stainless steel cannot be used
Is the hydrogen vent line under pressure? Personally, I don’t think carbon steel or stainless steel is very suitable, as when hydrochloric acid is used as the reactant, hydrogen gas is produced. The hydrogen gas produced by the reaction will inevitably carry away hydrogen chloride gas and water vapor. With chloride ions present, stainless steel cannot withstand it for very long; as for carbon steel in an acidic environment, the situation is even worse. Of course, some people use 316L as well; they say that if it breaks, they will replace it with one from Walder.