[2026 Corrosion Case] Sulfide stress corrosion cracking of carbon steel valves

2026-05-04View Original

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Case: Sulfide stress corrosion cracking of carbon steel valves. In a natural gas processing plant, carbon steel globe valves developed cracks in their bodies and suffered from brittle fracture after operating in a medium containing H₂S for half a year. The analysis revealed that the medium contains H₂S and there is tensile stress. The fracture exhibits characteristics of brittle fracture, which is sulfide stress corrosion cracking (SSCC). Solution: Replace the carbon steel valves with sulfur-resistant materials (such as heat-treated AISI 4130), keeping the hardness below HRC22 ； Materials are selected in accordance with the NACE MR0175 standard. After the replacement, the valve did not experience similar problems again.

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[2026 Corrosion Case] Sulfide stress corrosion cracking of carbon steel valves

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