Compatibility Atlas

SS 316L vs Duplex 2205for Seawater

Which valve material handles Seawater better — a side-by-side of compatibility ratings and the engineering reasons behind them.

Verdict

For Seawater valve service, Duplex 2205 is the better choice — rated Good versus Fair for SS 316L.

SS 316L

Fair

Pitting and crevice corrosion risk. Not recommended for seawater service. PREN must be verified.

All fluids SS 316L handles →

Duplex 2205

Good

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

All fluids Duplex 2205 handles →

Ratings and notes are drawn from the Seawater service guide. Confirm against concentration, temperature and velocity.

Related comparisons

Carbon Steel vs Duplex 2205 for SeawaterSS 316L vs Hastelloy C-276 for Sulphuric Acid (H₂SO₄)SS 316L vs PTFE-lined for Sulphuric Acid (H₂SO₄)SS 316L vs Hastelloy C-276 for Chlorine (Cl₂)
Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

Connected Engineering

Materials
A351 CF8M (SS316)Super Duplex 2507
Services
Seawater Service
Tools
Material Compatibility

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