Super Duplex 25 Chrome grades, 25CRW & 25CRS, are cold hardened duplex stainless steels intended for corrosion resistance in sweet (CO2) and moderately sour (H2S) environments with high chloride content, requiring high strength up to 450°F. The “Super” designation indicates that it has a Pitting Resistance Equivalence (PREN) ≥40. This provides increased resistance to H2S and localized corrosion from high chlorides and/or oxygen relative to standard 25 Chrome. It is therefore a common choice for use as tubing and liner in saltwater and water injection wells. However, all environmental factors, including H2S, CO2 , temperature, pH, and chloride concentration, should be considered before final material selection. These alloys are classified in MR0175/ISO15156 as duplex stainless steels having a Pitting Resistance Equivalent Number ≥40, suitable for H2S partial pressure ≤3.0 psi. •CCS/CCUS (Carbon Capture, Utilization and Sequestration)
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