Compatibility Atlas

Carbon Steel 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 Poor for Carbon Steel.

Carbon Steel

Poor

High corrosion rate. Acceptable only with cathodic protection and coating.

All fluids Carbon Steel 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

SS 316L vs Duplex 2205 for SeawaterCarbon Steel vs SS 316L for Sulphuric Acid (H₂SO₄)SS 316L vs Duplex 2205 for Crude OilCarbon Steel vs Duplex 2205 for Crude Oil
Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

Connected Engineering

Materials
A216 WCB Carbon SteelSuper Duplex 2507
Services
Seawater Service
Tools
Material Compatibility

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