329 vs 2205 Duplex
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
329
Stainless Steel
329 is the original commercial duplex stainless (the JIS SUS329J1 family), a 25% chromium, low-nickel ferritic-austenitic grade that predates the modern lean and 2205 duplexes. It still appears in Japanese and legacy specifications for chemical and seawater-adjacent equipment.
Standards: DIN 1.4460 · AISI 329 (UNS S32900) · JIS SUS329J1
2205 Duplex
Stainless Steel
2205 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.
Standards: DIN 1.4462 · AISI UNS S32205 · JIS SUS329J3L (close) · GB 022Cr22Ni5Mo3N
Chemical composition compared (%)
| Element | 329 | 2205 Duplex |
|---|---|---|
| C | ≤0.08 | ≤0.030 |
| Si | ≤0.75 | ≤1.00 |
| Mn | ≤1.00 | ≤2.00 |
| P | ≤0.040 | ≤0.030 |
| S | ≤0.030 | ≤0.020 |
| Cr | 23.00–28.00 | 22.00–23.00 |
| Ni | 2.50–5.00 | 4.50–6.50 |
| Mo | 1.00–2.00 | 3.00–3.50 |
| N | — | 0.14–0.20 |
Properties compared
| Property | 329 | 2205 Duplex |
|---|---|---|
| Delivery condition | Solution annealed | Solution annealed |
| Hardness | ≤277 HB | ≤293 HB |
| Tensile strength | ≥620 MPa | 655–880 MPa |
| Yield strength | ≥450 MPa | ≥450 MPa |
| Density | 7.80 g/cm³ | 7.80 g/cm³ |
| Magnetic | Yes | Yes |
| PREN | — | ~35 |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: 329 · 2205 Duplex. Substitution decisions for certified parts stay with the design authority.