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The effect of post weld heat treatment (PWHT) was studied on a variety of microstructures of the pressure vessel steel (ASTM A516) ranging from the ferrite/pearlite to the tempered bainite obtained by different cooling processes.
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Fatigue and fracture performance of UNS N07718 (718) and UNS N07716 (625+) in sour environments over a range of temperatures (300 to 400°F) and chloride concentrations (0.15wt% to 25wt% NaCl). Rising displacement fracture toughness test performed in a range of environments.
Hydrogen Induced Cracking (HIC) can be a major issue for line pipe exposed to sour environments. In this study, influence of the test solutions on HIC evaluation was investigated from the view point of corrosion. Electrochemical measurements were employed to compare corrosion behavior of line pipe steels between the 0.93N acetate buffer solution and the conventional 0.05N acetate solution.
Oil and gas wells are highly corrosive environments because they contain H2S and CO2. The 13Cr martensitic stainless steel is widely used in the oil and gas industry because of high good corrosion resistance in CO2 gas wells. Generally, the addition of Mo increases the passivity of steel. However, the role of Mo in passive films has not been completely clarified.
This paper reviews a theoretical background of buffer solutions for stainless steel oil country tubular goods materials at laboratory corrosion test, and then the concept is applied to NACE-TM0177-based solution and modified solutions.
In the oil and gas industry, oil country tubular goods and linepipes are exposed to the wet H2S environment (sour environment) in some cases. The presence of H2S promotes hydrogen entry into steel due to the catalytic action of H2S. The absorbed hydrogen enhanced by H2S affects hydrogen embrittlement.
In the oil and gas industry, oil country tubular goods or line pipes are exposed to wet H2S environments (sour environments) in some cases. The presence of H2S in the sour environment enhances hydrogen entry into the steel due to the catalytic action of H2S. The absorbed hydrogen enhanced by H2S affects hydrogen embrittlement. Hydrogen-induced cracking (HIC) is a hydrogen embrittlement phenomenon observed in sour conditions.