A case history is described involving microbiologically influenced corrosion (MIC) of AISI Type 304L stainless steel piping failure after being in contact with untreated stagnant, low chloride potable water for nine months. Specialized microbiological analysis techniques, including scanning electron and optical cmicroscopy, were used in the failure analysis.
Austenitic stainless steels are susceptible to caustic stress corrosion cracking (SCC) above 121°C. When sulfides are present in caustic solutions the SCC has been reported to occur at lower temperatures. This paper discusses a study of the role of sulfide in caustic solutions on SCC of austenitic stainless at T=~50°C.
This research effort was designed to evaluate stress-oriented hydrogen-induced cracking (SOHIC) behavior of a broad range of advanced plate steels (0.002 wt% sulfur) that were not produced to enhance resistance to cracking in wet H2S environments. Test results indicated that SOHIC resistance was adversely affected by microstructural (ferrite/pearlite) banding. However, additional factors also played a role in determining SOHIC behavior.