Stainless Steel
Duplex Stainless Steel 2205 (UNS S32205) — Composition, Properties & Supply
2205 duplex stainless (UNS S32205) has a roughly equal ferrite/austenite structure. Yield strength is about twice that of 316L and PREN is around 35, with excellent chloride stress-corrosion-cracking and pitting resistance, making it a mainstay for marine, chemical and oil and gas service.
What is the chemical composition of Duplex Stainless Steel 2205?
| Element | Symbol | Content (wt%) |
|---|---|---|
| Fe | Fe | Balance |
| Cr | Cr | 22.0–23.0 |
| Ni | Ni | 4.50–6.50 |
| Mo | Mo | 3.00–3.50 |
| N | N | 0.14–0.20 |
| Mn | Mn | ≤ 2.00 |
| Si | Si | ≤ 1.00 |
| C | C | ≤ 0.030 |
Values are typical specification limits. Actual heat analysis is reported on the EN 10204 3.1 mill test certificate supplied with each shipment.
What are the mechanical properties of Duplex Stainless Steel 2205?
| Property | Value | Note |
|---|---|---|
| Tensile strength | ≥ 620 MPa | Room temperature |
| Yield strength (0.2% offset) | ≥ 450 MPa | Room temperature |
| Elongation | ≥ 25 % | Gauge length 50 mm / 4D |
| Hardness | ≤ 293 HB | Brinell / Rockwell |
What are the physical properties of Duplex Stainless Steel 2205?
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Melting range | 1385–1443 °C |
| Thermal conductivity | 19.0 W/m·K |
| Elastic modulus | 190 GPa |
| Maximum service temperature | 300 °C |
What are the key characteristics of Duplex Stainless Steel 2205?
- Yield ≥ 450 MPa, about twice 316L
- Much better chloride SCC resistance than 304/316
- PREN around 35 — strong pitting and crevice resistance
- Low nickel content makes cost less sensitive to nickel prices
Where is Duplex Stainless Steel 2205 used?
- Offshore platforms and subsea pipelines
- Chemical vessels and heat exchangers
- Oil and gas transport and sour gas piping
- Desalination and effluent treatment
- Pulp digesters and bleaching equipment
Which standards and specifications cover Duplex Stainless Steel 2205?
What product forms are available?
Frequently asked questions
What is the service temperature limit of 2205 duplex?
2205 is generally limited to −50 to 300 °C. Long-term exposure between 300 and 525 °C precipitates sigma phase, sharply reducing toughness and corrosion resistance, while below −50 °C the ferrite phase risks ductile-to-brittle transition. For high-temperature service use 316H, 800H or a nickel alloy.
How do I choose between 2205 and 2507 super duplex?
2507 (S32750) contains 25% Cr, 4% Mo and 0.27% N with PREN around 40–42 and yield near 550 MPa — better corrosion resistance and strength than 2205 at roughly 30–50% higher price. Choose 2507 for high chloride, higher temperature or extended-life service; 2205 is adequate for normal seawater and chemical duties.
Need Duplex Stainless Steel 2205 bar, tube, plate or forgings?
Send the grade, dimensions, standard and quantity. We answer within 10 minutes on working days and quote within 24 hours, with EN 10204 3.1 certification.
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