2205 Duplex
Data verified2205 is the most widely used duplex stainless steel, with a roughly 50/50 ferrite-austenite structure giving twice the yield strength of 316L plus excellent pitting and stress-corrosion resistance from 22% chromium, 3% molybdenum and nitrogen.
Chemical composition
| Element | Content (%) |
|---|---|
| C | ≤0.030 |
| Si | ≤1.00 |
| Mn | ≤2.00 |
| P | ≤0.030 |
| S | ≤0.020 |
| Cr | 22.00–23.00 |
| Ni | 4.50–6.50 |
| Mo | 3.00–3.50 |
| N | 0.14–0.20 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Delivery condition | Solution annealed |
| Hardness | ≤293 HB |
| Tensile strength | 655–880 MPa |
| Yield strength | ≥450 MPa |
| Density | 7.80 g/cm³ |
| Magnetic | Yes |
| PREN | ~35 |
Heat treatment
Solution anneal 1020–1100 °C, water quench. Welding must be followed by proper cooling; service temperature is normally limited to about -50 to +300 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.4462 |
| aisi | UNS S32205 |
| jis | SUS329J3L (close) |
| gb | 022Cr22Ni5Mo3N |
Compare side by side: 2205 Duplex vs 2507 Super Duplex · 2205 Duplex vs 2304 Duplex
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Oil and gas piping, chemical tankers, desalination, heat exchangers, offshore platforms, FGD equipment.
Processing: Weld with 2209-type filler and controlled heat input (0.5–2.5 kJ/mm) to preserve phase balance; machining is demanding due to high strength and work hardening.
FAQ
- 2205 vs 316L — when is duplex worth it?
- Where chlorides, stress and strength combine: 2205 resists chloride stress-corrosion cracking that cracks 316L, and its doubled yield strength often allows thinner, lighter pressure parts.
- Can 2205 be used at high temperature?
- No — the ferrite phase embrittles between roughly 300 and 950 °C, so duplex grades are limited to about 300 °C maximum in pressure service.
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Ask for a quotationVisit NasteelSource: ASTM A240 / EN 10088 published ranges (UNS S32205) · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.