Preventing Stress Corrosion Cracking in Chemical Plant Tubing
Stress corrosion cracking (SCC) needs three things at once: tensile stress, a susceptible alloy, and an aggressive environment (commonly chlorides, at elevated temperature). Remove any one of the three and SCC risk drops sharply. In practice that means: selecting a more resistant alloy when chlorides, high temperature, or other aggressive species are present — duplex grades such as 2205 resist chloride-driven SCC better than standard 304/316L austenitic grades; minimizing residual stress from welding, cold working, and sharp bends, with stress relief or annealing where appropriate; keeping chloride levels and operating temperature as low as the process allows; and designing joints and connections to avoid crevices and stagnant zones where chlorides can concentrate during shutdowns.
For process lines where 316L is marginal for the actual chemistry, TeCarve supplies 2205 duplex tube alongside standard 304/304L/316/316L grades — tell us the chloride level, pH, oxidizers, and temperature and we can help confirm the right alloy for the service condition.

