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Stress corrosion cracking of stainless steel in polyoxysulfuric acid during petrochemical refining

2025-06-08View Original

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Taking the hydrodesulfurization unit as a typical example, stress corrosion cracking of stainless steel in polythiosulfuric acids (H2SxO6, x=3~5) is quite notable. When the equipment is operating normally, it is corroded by hydrogen sulfide, resulting in the formation of iron sulfide; during shutdown for maintenance, this iron sulfide reacts with oxygen and water in the air to form H2SxO6. Stress corrosion cracks occur in areas of Cr-Ni austenitic stainless steel equipment and pipelines where residual stresses are high (such as the heat-affected zones of welds and bent sections).

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