A novel material selection method and application in an aqueous environment containing CO₂, H₂S, O₂ and SO₂

The corrosion in the aqueous environment of CO2-H2S-O-2-SO2 is extremely severe, causing frequent failures of pipeline and posing a challenging issue for material selection. This paper drew on excellent standards and past experiences to provide a suitable method for selecting materials. The method consisted of four components: standard primary selection, corrosion evaluation selection, mechanical property selection, and economic final selection. A case study demonstrated that the applicable materials for the environment (total pressure of 1.5 MPa, temperature of 30-120 C-degrees, H2S content of 0.1-1.5%, CO2 content of 8-55%, SO2 content of 0-0.00015% and O-2 content of 1-3%) were composed of 2Cr13 or 316L. Additionally, the main control factors for corrosion rate were ranked as follows: O-2 > H2S > temperature > CO2 > SO2. And a reduction in mechanical properties was observed for 2Cr13, 316L, and 825 after corrosion.