Effect of temperature on Microstructure and Corrosion Behavior of Carbon Steel: Experimental study and modeling
DOI:
https://doi.org/10.22399/ijcesen.4161Keywords:
API N80, tempering temperature, Corrosion, Quadratic ModelAbstract
Oil field water source wells are vulnerable to corrosion issues because of their intricate operating environments. Because corrosion-related failures result in significant downtime, managing corrosion is a crucial and complicated task in the petroleum and gas industry. This study used X-ray diffraction (XRD), an electrochemical measuring technique, to examine the impact of tempering temperatures (200, 400, and 500 °C) on the corrosion behavior of American Petroleum Institute (API) N80 steel in albian water at various gradient temperatures. The API N80 steel samples crystallize in a ferrite-type structure, according to XRD patterns. All of the API N80 samples, we noted, have a nanometric grain size . As the tempering temperature rises, there is a correlation between the corrosion rates of samples and structural changes . Excellent corrosion resistance and a decreased corrosion current density were demonstrated by steel N80 at a higher tempering temperature. Increased grain sizes and decreased residual stress and hardness are the reasons for the corrosion resistance difference. The Quadratic Corrosion Model was used to determine the optimal operating conditions for minimizing the corrosion rate. The statistical model predicted the optimal conditions for the selected t variables as a tempering temperature of approximately 450 °C , and a thermal gradient (ΔT) of around 1 °C, Under these conditions, the predicted corrosion rate is in the range of 37 μm/year.
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