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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Zheng, Chengsi Wang, Gang Wu, Xiang Ai, Zhibin |
| Copyright Year | 2018 |
| Abstract | An atmospheric tower head, manufactured using a clad plate of carbon steel + 2205 duplex stainless steel (DSS), was reported to show clear cracks in the DSS layer after serving for four years at an atmospheric distillation unit of a refinery. The cracks propagated in a dendritic manner within the heat-affected zone (HAZ) and the weld metal, accompanying locations with a higher hardness than that of locations without cracks. Some nondestructive methods were used to analyze the chemical composition, microstructure, hardness of the base metal, HAZ and weld metal. An analysis based on these results and the statistical data of an HCl-H2S-H2O corrosion environment was proposed to explain the formation of cracks from the viewpoint of physical metallurgy. The analysis showed that there were conditions favorable for the precipitation of the sigma (σ) phase in the DSS layer during the manufacturing process of the head, resulting in the occurrence of stress corrosion cracking (SCC) in the DSS layer under the harsh HCl-H2S-H2O environment. Moreover, some solutions, i.e., the enhancement of anticorrosion measures, the optimized microstructure of the DSS, and modified welding parameters were recommended to avoid a similar failure. |
| Sponsorship | Pressure Vessels and Piping Division |
| File Format | |
| ISBN | 9780791851661 |
| DOI | 10.1115/PVP2018-84348 |
| Volume Number | Volume 5: High-Pressure Technology; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD); Rudy Scavuzzo Student Paper Symposium and 26th Annual Student Paper Competition |
| Conference Proceedings | ASME 2018 Pressure Vessels and Piping Conference |
| Language | English |
| Publisher Date | 2018-07-15 |
| Publisher Place | Prague, Czech Republic |
| Access Restriction | Subscribed |
| Subject Keyword | Welding Metals Fracture (materials) Stress corrosion cracking Corrosion protection Base metals Heat Precipitation Corrosion Failure analysis Stainless steel Carbon steel Manufacturing Metallurgy Failure |
| Content Type | Text |
| Resource Type | Article |
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