Material Selection Investigation of Corrosion Resistant Alloys for CCS Applications

Abstract In carbon dioxide capture and storage (CCS), CO2 containing various impurities emitted from multiple sources is captured and injected underground through pipes at high pressure in a dense or supercritical phase. Experimental data on material corrosion resistance under such conditions have been extremely limited. Therefore, corrosion tests were conducted to evaluate the corrosion resistance of CRA materials in supercritical CO2 with O2, SO2, NO2 and H2S and practical mixtures of gases. These tests were performed under the assumption of flow back of the formation water. Based on our investigation of 13Cr (S42000), Super 13Cr (S41426), Duplex stainless steels (S82551), Super duplex stainless steels (S39274), all test data were compiled into material selection charts with two versions corresponding to different chloride concentrations as continuing work form AMPP publication C2024-20598, C2025-00004 and C2025-00068. Furthermore, accidental depressurization of high-pressure CO2 may lead to blowout, causing a temperature drop due to the Joule-Thomson effect. To address this concern, Charpy impact test results for each alloy are presented, providing a comprehensive assessment of material integrity under low-temperature conditions. Overall, super duplex stainless steel UNS S39274 exhibits excellent suitability even under high-salinity formation water flowback. When low-temperature toughness is a critical requirement, solution-annealed UNS S39275 (80 ksi grade) demonstrates superior performance. Considering economic feasibility, UNS S82551 is identified as the next most effective option.