High‐temperature high‐pressure SCC testing of corrosion‐resistant alloys

Abstract

Stress corrosion cracking test methods of corrosion-resistant alloys are reviewed. The interest to write a review on this topic was drawn by demands for oil country tubular goods applicable in deep wells with high pressures, high temperatures, and the presence of H 2 S, where stress corrosion cracking is one of the most critical failure modes. All conventional methods for determining the stress corrosion cracking resistance of an alloy, mainly slow strain rate testing, constant load testing (tensile, 4-PB), constant strain testing (U-bend, C-ring), and fracture mechanics (double cantilever beam sample) are covered. Considering the variety of testing solutions, the field of search is narrowed to hot (up to 250°C) aqueous chloride solutions with dissolved H 2 S and CO 2 gases under high pressure (up to 200 bar total pressure).

Investigation of Multi-Factor Stress Corrosion Cracking Failure of Safe-End Feedwater Lines of Submarine Power System

“…The open circuit potentials of 20 steel and 316L steel were acquired over 240 h at 100 °C. The Ag/AgCl reference electrode was subjected to high-temperature and high-pressure conditions, and its potential was corrected with respect to the temperature as follows [ 26 , 27 , 28 ]: where E SHE refers to the potential relative to the standard hydrogen electrode, E obs is the potential measured in an extreme environment, T denotes the testing temperature (°C), and T 0 is room temperature (25 °C).…”

“…The cell was then connected to the electrochemical workstation for further measurements of the corrosion potentials and currents. The open circuit potentials of 20 steel and 316L steel were acquired over 240 h at 100 • C. The Ag/AgCl reference electrode was subjected to high-temperature and high-pressure conditions, and its potential was corrected with respect to the temperature as follows [26][27][28]:…”

Stress Corrosion Cracking Mechanisms of UNS S32205 Duplex Stainless Steel in Carbonated Solution Induced by Chlorides

“…The K I will increase until the critical K I value where SCC is triggered (K ISCC ) is reached, which for UNS S32205, a K ISCC ≈ 50 MPa √ m will be assumed based on literature [46,47]. Figure 8 shows the υ crack and the stress as a function of time for SCPS (Figure 8a) and CBS (Figure 8b).…”