Super Duplex
High-alloy duplex stainless steels - 2507 (UNS S32750) and Zeron 100 (UNS S32760) - with PREN (Pitting Resistance Equivalent Number) above 40. Extremely resistant to chloride pitting, crevice corrosion, and stress corrosion cracking. Used in seawater injection, offshore, and subsea service.
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What is Super Duplex used for in industrial valves?
High-alloy duplex stainless steels - 2507 (UNS S32750) and Zeron 100 (UNS S32760) - with PREN (Pitting Resistance Equivalent Number) above 40. Extremely resistant to chloride pitting, crevice corrosion, and stress corrosion cracking. Used in seawater injection, offshore, and subsea service.
When should I specify Super Duplex for valve body or trim?
Super Duplex is specified when the process fluid, temperature, or pressure requirements exceed what standard carbon steel (A216 WCB) or austenitic stainless steel (A351 CF8M) can handle. Material selection must consider corrosion rates, maximum and minimum design temperatures, and compliance with NACE MR0175 for sour service. Vajra Industrial Solutions can supply valves in Super Duplex with full mill certificates.
Is Super Duplex compatible with sour (H2S) service per NACE MR0175?
Material qualification for sour service (NACE MR0175 / ISO 15156) depends on the hardness limits, heat treatment condition, and UNS designation of the specific alloy. For H2S-containing service, the valve material order and PMI (positive material identification) must be verified against the applicable NACE material group. Contact Vajra Industrial Solutions for material recommendations specific to your H2S partial pressure and chloride conditions.
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