Duplex Stainless Steel
A family of stainless steels with a mixed austenitic-ferritic microstructure. Common grades: 2205 (UNS S31803/S32205), 2507 (super-duplex, UNS S32750). Offers approximately double the strength of 316L with better corrosion resistance in chloride environments. Used in offshore, seawater desalination, and chemical service.
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Frequently Asked Questions
What is Duplex Stainless Steel used for in industrial valves?
A family of stainless steels with a mixed austenitic-ferritic microstructure. Common grades: 2205 (UNS S31803/S32205), 2507 (super-duplex, UNS S32750). Offers approximately double the strength of 316L with better corrosion resistance in chloride environments. Used in offshore, seawater desalination, and chemical service.
When should I specify Duplex Stainless Steel for valve body or trim?
Duplex Stainless Steel 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 Duplex Stainless Steel with full mill certificates.
Is Duplex Stainless Steel 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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