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) with various microstructures, compositions, types of metallurgical processing, welding and postweld heat treatment (PWHT). This behavior was examined in terms of apparent threshold stresses as a function of the above mentioned variables. These data were compared and contrasted to the performance of conventional 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. A relationship was developed for the predicted average cracking ratio (PACR) that included the influence of banding index, carbide microhardness and calcium treatment.

Subject
Sulfur, Hydrogen induced cracking, Materials, Carbides, Microstructure, Welding, Stress cracking, Microhardness, Stress, Steel, Stress oriented hydrogen induced cracking, Hydrophobic interaction chromatography, Hardness
Keywords:
stress-oriented hydrogen-induced cracking, SOHIC, C-Mn steels, sour service, H2S
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2002
Association for Materials Protection and Performance (AMPP)
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