AISI type 321 stainless steel heat exchanger tubes failed after only three months of service. Macroscopic examination revealed that the leaks were the result of localized pitting attack originating at the water side surfaces of the tubes. Metallographic sections were prepared from both sets of tubes. Microscopic examination revealed that the pits had a small mouth with a large subsurface cavity which is typical of chloride pitting of austenitic stainless steel. However, no pitting was found in other areas of the system, where the chloride content of the process water was higher. This was attributed to the fact that...
Philip J. Kenny, Oxygen-Assisted Chloride Pitting of AISI 321 Stainless Steel, ASM Failure Analysis Case Histories: Chemical Processing Equipment, ASM International, 2019, https://doi.org/10.31399/asm.fach.chem.c9001654
Download citation file:
Join ASM International
Being a member of the world’s largest association of materials professionals provides the benefits and resources you need to accomplish your personal and professional goals.