Corrosion in water supply pipe stainless steel 304 and a supply line of helium in stainless steel 316 |
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| Affiliation: | 1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;2. University of Science and Technology of China, Hefei 230026, China;1. School of Mechanical Engineering, Shandong University, Jinan 250061, China;2. Engineering and Technology Research Center for Special Equipment Safety of Shandong Province, Jinan 250061, China;3. Department of Machinery and Electronics Engineering, Shandong Agriculture and Engineering University, Jinan 250100, China |
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| Abstract: | A corrosion spreading throughout the 304 stainless steel tubing of a water system to supply various buildings was observed, and also leaks were detected in welding zones. The same place is also crossed by a gas distribution network, with a helium pipe 316 of stainless steel that required periodic repairs more or less every two years, due to the presence of leaks. The tests showed that both types of stainless steel have suffered localized corrosion induced by hypochlorite ion, in a mechanism of dry/wet, and that the welding procedure performed on the 304 stainless steel is unacceptable. Some immediate procedures were undertaken to keep systems running, but recommendations were given for a final resolution of the problems. |
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| Keywords: | Stainless steel 304 Stainless steel 316 Pitting corrosion Hypochlorite Welding |
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