This paper reports the performance of welded API 5L X65 in an aqueous solution pressurized with 138 MPa supercritical CO2. Welded API 5L X65 carbon steel specimen was prepared and exposed to 3.5 wt.% NaCl solution pressurised with 138MPa CO2. The sample was stressed to 100% of 0.2% proof stress using a four-point method. The specimen were extracted transverse to the weld and was tested with the weld root in tension. The test ran at 40°C for 30 days. Post-test visual examination indicated a scale on the surface which was confirmed by microstructural characterization. The SEM micrographs indicated corrosion damage, however, no cracks were seen on the tensile surface of the specimen.

Subject
Test methods, Materials, Corrosion rate, Materials performance, Corrosion cracking, Stress cracking, Stress, Corrosion scales, Sodium chloride solution, Iron carbonate scale, Steel, Scale, Carbon steel
Keywords:
welded pipe, sweet corrosion, cracking, carbon steel, supercritical CO2
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2023
Association for Materials Protection and Performance (AMPP)
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