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Performance of API 5L X65 in 138 MPa Supercritical CO2

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Carbon steels and low alloy steels are the workhorse of several industries where properties such as strength, fracture toughness and weldability play a key role. In addition to these properties, carbon steels are also the most cost effective materials is several applications. Of particular interest is the API 5L X65 which is widely used in oil and gas exploration, production and transportation service.

Product Number: 51323-18863-SG
Author: Shiladitya Paul
Publication Date: 2023
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$20.00
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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.

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.

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