Material selection in wet hydrogen sulfide corrosion environments?
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In a wet hydrogen sulfide corrosion environment, which material is better: Q245R or Q345R? I saw a paper stating that 16MnR should not be used in wet hydrogen sulfide corrosion environments. Do you agree with this view?
Stainless steel should be used in humid hydrogen sulfide environments
Material selection in wet hydrogen sulfide corrosion environments is specified in detail in SH/T3075
If it is confirmed to be a wet hydrogen sulfide environment, both of these materials will essentially reach the end of their useful life. Theoretically, the higher the carbon content, the greater the strength, and the faster they will be worn out.
18-8 is not suitable; 10# is better than 20#, which is in turn better than 16Mn
Carbon steel and martensitic stainless steel won’t work; austenitic stainless steel is required
Q345R can be used, but restrictions must be placed on the P and S contents, carbon equivalent, hardness, and weld toughness.
In a wet hydrogen sulfide corrosion environment, Q245R performs better than Q345R. Wet hydrogen sulfide primarily causes stress corrosion, and materials with lower strength are more resistant to this type of corrosion; therefore, Q245R is typically used along with stress-relief heat treatment after welding.
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In a wet hydrogen sulfide corrosion environment, Q245R is a better choice. The greater the strength or hardness of the steel, the worse its resistance to hydrogen sulfide corrosion and cracking; therefore, 16MnR should not be used in such environments. I agree with this view.