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51315-5785-Susceptibility of Cold-Worked Medium Carbon Steel to Stress Corrosion Cracking in Synthetic Formation Water and CO? Environment Using the Slow Strain Rate Method

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Product Number: 51315-5785-SG
ISBN: 5785 2015 CP
Author: Alyaa Elramady
Publication Date: 2015
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Susceptibility of Cold-Worked Medium Carbon Steel to Stress Corrosion Cracking in Synthetic Formation Water and CO2 Environment Using the Slow Strain Rate MethodThe slow strain rate (SSR) test is a quick and simple method that is used to gauge the susceptibility of metals to stress corrosion cracking (SCC). This research uses the SSR method to study the effect of prior cold work of 0.18 wt% C martensitic casing and tubing steel on stress corrosion cracking (SCC). Two cold-work processes were used namely cold-rolling and tubular expansion. The steels were cold worked to 10% and 20% levels of strain. Longitudinal tensile specimens were extracted from the rolled plates and the expanded tubes. In an environment test the specimens were exposed to an environment of synthetic formation water CO2 pressure of 200psi and stretched to failure at a constant strain rate of 10-6 in/sec at room temperature. Two baseline tests were performed in air and under the same conditions of temperature and strain rate used for the environment test. The values of the yield strength ultimate tensile strength (UTS) time to failure elongation and reduction in area were obtained using the data from the environment and baseline tests. . The surface morphology was characterized using field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). It was observed that the specimens are magnetic and it was verified that the scale on the surface is magnetite. The time to failure decreased for the cold-worked specimens in the solution from that of the cold-worked specimens in air. Both cold-worked processes showed the same time to failure in the 10% strain level. As the strain level increased to 20% the cold rolled specimen broke after 14h while the expanded specimen took 18h to reach failure. For the cold-rolled steels the 20% cold work had a higher UTS compared to the 10% in the test environment. The expanded steels did not show a significant change in the UTS between the 10% and 20% deformation.
Susceptibility of Cold-Worked Medium Carbon Steel to Stress Corrosion Cracking in Synthetic Formation Water and CO2 Environment Using the Slow Strain Rate MethodThe slow strain rate (SSR) test is a quick and simple method that is used to gauge the susceptibility of metals to stress corrosion cracking (SCC). This research uses the SSR method to study the effect of prior cold work of 0.18 wt% C martensitic casing and tubing steel on stress corrosion cracking (SCC). Two cold-work processes were used namely cold-rolling and tubular expansion. The steels were cold worked to 10% and 20% levels of strain. Longitudinal tensile specimens were extracted from the rolled plates and the expanded tubes. In an environment test the specimens were exposed to an environment of synthetic formation water CO2 pressure of 200psi and stretched to failure at a constant strain rate of 10-6 in/sec at room temperature. Two baseline tests were performed in air and under the same conditions of temperature and strain rate used for the environment test. The values of the yield strength ultimate tensile strength (UTS) time to failure elongation and reduction in area were obtained using the data from the environment and baseline tests. . The surface morphology was characterized using field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). It was observed that the specimens are magnetic and it was verified that the scale on the surface is magnetite. The time to failure decreased for the cold-worked specimens in the solution from that of the cold-worked specimens in air. Both cold-worked processes showed the same time to failure in the 10% strain level. As the strain level increased to 20% the cold rolled specimen broke after 14h while the expanded specimen took 18h to reach failure. For the cold-rolled steels the 20% cold work had a higher UTS compared to the 10% in the test environment. The expanded steels did not show a significant change in the UTS between the 10% and 20% deformation.
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