Duplex Steel

Duplex

Roughly twice the yield strength of 304/316 with far better chloride stress corrosion cracking resistance. Lets designers reduce wall thickness and weight.

Grades

Commonly supplied

2205, S31803, S32205, 2304, S32304

UNS: S31803 · S32205 · S32304

Characteristics

What it does well

Structure	Balanced austenite and ferrite, typically 50/50
Strength	Yield around 450 MPa, about double austenitic grades
Corrosion	Strong resistance to chloride SCC and pitting
Limits	Avoid prolonged exposure above 300 °C

Product forms

Supplied as

Flanges Pipes & Tubes Buttweld Fittings Forged Fittings Fasteners Sheets, Plates & Coils Stainless Steel Rings

Typical applications

Where it is used

Seawater systems

Oil and gas process

Desalination

Chemical tankers

Technical data

Composition and properties

Typical values for reference. Confirm the actual heat against the mill certificate supplied with your order.

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Duplex Steel

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