Regarding material selection
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Hello everyone, I would like to ask what material should be used for pressure vessels containing H2S? What material should be used for pressure vessels containing CO2? What material should be used for pressure vessels containing CL ions?
There are some relevant papers online that you can search for as a reference.
The material choice for containers depends on the medium and temperature. Generally, at normal temperatures with low H2S levels, carbon steel is sufficient; if the temperature is slightly higher, stainless steel is a better choice than carbon steel. In cases of high temperatures along with high H2S levels, zirconium is used internationally, with a service life of around 10 years. In China, however, zirconium-based materials have a service life of less than two years. For CO2, carbon steel is sufficient. For media containing chloride ions, carbon steel can be used if their concentration is low; however, if the concentration is high, other materials must be chosen.
For the selection of materials suitable for H2S environments, refer to Section 7.8 of HG20581-2011； Carbon steel is sufficient for CO2 media ； In media containing chloride ions, austenitic stainless steels such as 304 and 316 should not be used. This reaction mechanism can be found online; chloride ions can destroy the oxide layer on the surface of stainless steel.