Super Duplex 25 Chrome (25CRS) is a cold-hardened duplex stainless steel with a Pitting Resistance Equivalent Number (PREN) ≥ 40, delivering excellent resistance to localized corrosion, including pitting and crevice attack in chloride- and oxygen-rich environments. Rated for service temperatures up to 450°F, 25CRS is well-suited for sweet (CO₂) and moderately sour (H₂S) environments, and is qualified under MR0175/ISO 15156 for use with H₂S partial pressures up to 3.0 psi. It is commonly deployed as tubing, casing, or liners in demanding applications such as Carbon Capture (CCUS/CCS), Geothermal, and Saltwater or Water Injection wells. VAM TOP® HC (High Compression) and VAM TOP® HT (High Torque) are based on the main features of the VAM TOP® connection. While still fully interchangeable with VAM TOP ®, they level up the bar to bring additional benefits: VAM TOP ® HC to address various high-compression applications where it may be necessary to apply extreme compressive loads to the string (elevated temperature inducing compression, compaction, subsidence…). VAM TOP ® HT to provide reinforced torque capability for liners and where high torque is anticipated due to string rotation during running operations (torque rotating liner while running, rotating casing when cementing).
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