Materials resistant to hydrogen sulfide corrosion anti-hic
Thread Content
Under what conditions should materials resistant to hydrogen-induced cracking be used? Refer to NACE standard MRO175 for details: Hydrogen sulfide corrosion is related to pH value, hydrogen partial pressure, and temperature. What are the specific limitations? For example: when the H2S concentration is between 50–10,000 mg/L and the pH is between 5.5–7.5, with a design temperature of 300, 20# steel is selected; the H2S concentration remains within 50–10,000 mg/L, and the pH is 5.5
Anti-HIC steel is a type of steel designed to resist corrosion caused by H2S at low temperatures. If H2S is present at high temperatures, it is necessary to consult the Couper curve in order to select the appropriate steel – whether it should be stainless steel or cadmium-molybdenum steel. At low temperatures, water is present, creating a wet, acidic corrosive environment; in such cases, reference can be made to SH/T3129 \"Guidelines for Material Selection in the Design of Key Pipelines for Processing High-Sulfur Crude Oil\"
With such high temperatures, it is certainly difficult to select suitable materials; at lower temperatures, non-metallic materials can be used, while at high temperatures alloy steel becomes an option, and bimetallic composite pipes can also be considered.
This post was last edited by leo_0088 on 2015-4-28 17:23. Hydrogen sulfide stress corrosion testing: GB/T 8650-2006; Resistance to hydrogen sulfide stress corrosion: GB/T 4157-2006
For high temperatures, Cr-Mo(HIC) can also be used