Material Compatibility Reference

Duplex 2205 — Fluid Compatibility

Which industrial fluids Duplex 2205 valves can handle — rated across 11 process media with engineering notes. The compatibility reference for specifying Duplex 2205 body and trim.

What fluids is Duplex 2205 compatible with?

Duplex 2205 is rated across 11 industrial fluids in our compatibility data. It performs well in Carbon Dioxide (CO₂), Crude Oil, Natural Gas, Urea Solution (Carbamide / DEF / AdBlue), Brine / Sodium Chloride Solution, Hydrogen Sulphide (H₂S - Sour Gas). It is not recommended for Hydrochloric Acid (HCl). Full ratings and notes below — always confirm against concentration, temperature and velocity.

Material grades & metallurgy

ASTM A995 CD4MCu / A890 4ADuplex SS Cast (CD4MCu)ASTM A182 F51Forged Duplex 2205 (F51)ASTM A182 F60Duplex 2205 Forged (Grade F60)

Excellent4 fluids

Carbon Dioxide (CO₂)CO₂ + H₂S service (EOR wells). Superior to 316L.

Crude OilSour crude with H₂S - superior to 316L with better H₂S cracking resistance.

Natural GasSour gas service - superior H₂S resistance.

Urea Solution (Carbamide / DEF / AdBlue)Used in high-pressure urea synthesis loops at elevated temperature.

Good3 fluids

Brine / Sodium Chloride SolutionGood for most brine concentrations at moderate temperature.

Hydrogen Sulphide (H₂S - Sour Gas)Restricted to solution-annealed condition, max hardness per NACE MR0175 Table D.1.

SeawaterPREN ~35 - acceptable for most seawater applications at ambient temperature.

Fair3 fluids

Hydrogen (H₂)Risk of HE at high pressure. Verify per ISO 11114-4.

Sulphuric Acid (H₂SO₄)Limited to dilute, cold service only. Verify with corrosion data.

Synthesis Gas (Syngas - CO + H₂)Not recommended for high-H₂-partial-pressure above 50 barg without NACE review.

Not Recommended1 fluids

Hydrochloric Acid (HCl)Chloride SCC risk.

Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

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