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[2026 Corrosion Case] Chloride stress corrosion cracking of 316L stainless steel valves

2026-05-04View Original

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Case: Chloride stress corrosion cracking of 316L stainless steel valves. In a seawater cooling system, cracks appeared in the body of a 316L stainless steel butterfly valve after 2 years of operation, resulting in leakage. The analysis revealed that the medium is seawater (with Cl⁻ at about 20,000 ppm) and the operating temperature is around 60°C. Metallographic examination revealed typical transgranular stress corrosion cracking. Solution: Replace 316L with 2205 duplex stainless steel to improve SCC resistance ; Keep the operating temperature below 50℃ ; Optimize pipeline layout to reduce thermal stress. The valve is operating normally after replacement.

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