2205 duplex stainless steel (UNS S32205 / UNS S31803) is a nitrogen-enhanced, dual-phase (austenitic-ferritic) stainless steel. It combines high mechanical strength (roughly twice that of standard austenitic grades like 304 and 316L) with excellent resistance to chloride stress corrosion cracking and pitting. Designated as S22053 (GB/T, China), SUS329J3L (JIS, Japan), and 1.4462 (EN, Europe). Widely used in chemical processing, marine, and oil & gas industries.
Chemical Composition
Typical chemical composition (% by mass) per ASTM A240 / EN 10088.
| Grade | C (%) | Cr (%) | Ni (%) | Mo (%) | N (%) |
|---|---|---|---|---|---|
| 2205 / S32205 | ≤0.03 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | 0.14–0.20 |
Note: The addition of Nitrogen (N) enhances structural strength and improves resistance to pitting and crevice corrosion. The microstructure consists of roughly 50% austenite and 50% ferrite.
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| 2205 | ≥450 | ≥620 | ≥25 | ≤290 |
Available Sizes & Delivery
| Thickness (Plate/Sheet) | 0.5–100 mm |
| Diameter (Round Bar) | 10–300 mm |
| Forms Available | Plate, coil, round bar, seamless/welded pipe, flange |
| Standard | ASTM A240 / ASTM A789 / EN 10088 |
| Mill Test Certificate | EN 10204 3.1 with every shipment |
| MOQ | 3 Tons |
| Delivery Time | Within 7-15 days (≤500 tons) |
Why Order from Zhongtang Steel?
- Superior Strength — Double the yield strength of 304/316L, allowing for weight reduction in designs
- Excellent Corrosion Resistance — Outstanding against chloride stress corrosion cracking (SCC)
- EN 10204 3.1 MTC supplied with every shipment
- ISO 9001 certified manufacturer since 1998
- Mill-direct pricing — no trading company markup
Applications
- Chemical processing — pressure vessels, reactors, heat exchangers
- Oil and gas industry — offshore platforms, pipelines, risers
- Marine environments — shipbuilding, desalination plants
- Pulp and paper industry — digesters, bleach plants
- Pollution control — FGD (Flue Gas Desulfurization) systems
- Storage tanks and high-pressure piping
Values are typical reference ranges per ASTM A240. Actual properties may vary by mill and production route. Mill test certificates (EN 10204 3.1) are supplied with every shipment — contact us for exact data sheets.
