I would like to know why, in the environment of wet hydrogen sulfide stress corrosion, ferritic stainless steels such as S11306 and S11348 are recommended, while austenitic stainless steels are not?
Thread Content
The last edit to this post was made by forowhl on 2021-10-28 at 12:13. As the title suggests, according to SHT 3096-2012 \"Guidelines for Material Selection in the Design of Equipment and Piping for High-Sulfur Crude Oil Processing Plants\", carbon steel combined with ferritic stainless steel composite sheets such as S11306 or S11348 is recommended for use in the construction of the shells of distillation towers. Why not choose austenitic stainless steels such as S321 or S316? Is it purely due to cost, or does ferritic stainless steel have a better resistance to wet hydrogen sulfide stress corrosion compared to S321 or S316? Everyone is welcome to discuss. .
This is quite professional; most people are not aware of it.
https://bbs.hcbbs.com/thread-250643-1-1.html Check out previous posts; ferrite may save on alloy usage, be more resistant to stress corrosion, be less sensitive to CL-, and have an expansion coefficient that is closer to that of carbon steel matrices
Check the 30579 damage pattern; it’s included there
We have practical experience with corrosion protection in humid hydrogen sulfide environments; it’s just that we’re not sure what the temperature is in the case of equipment