2304 Duplex 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.
2304 Duplex
Stainless Steel
2304 is a lean duplex grade with corrosion resistance comparable to 316L and roughly double its yield strength, without the molybdenum cost of 2205. It is used for tanks, structural parts and bridges in mildly aggressive environments.
Standards: DIN 1.4362 · AISI UNS S32304 · GB 022Cr23Ni4MoCuN
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 | 2304 Duplex | 2205 Duplex |
|---|---|---|
| C | ≤0.030 | ≤0.030 |
| Si | ≤1.00 | ≤1.00 |
| Mn | ≤2.50 | ≤2.00 |
| P | ≤0.040 | ≤0.030 |
| S | ≤0.030 | ≤0.020 |
| Cr | 21.50–24.50 | 22.00–23.00 |
| Ni | 3.00–5.50 | 4.50–6.50 |
| Mo | 0.05–0.60 | 3.00–3.50 |
| Cu | 0.05–0.60 | — |
| N | 0.05–0.20 | 0.14–0.20 |
Properties compared
| Property | 2304 Duplex | 2205 Duplex |
|---|---|---|
| Delivery condition | Solution annealed | Solution annealed |
| Hardness | ≤290 HB | ≤293 HB |
| Tensile strength | 600–820 MPa | 655–880 MPa |
| Yield strength | ≥400 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: 2304 Duplex · 2205 Duplex. Substitution decisions for certified parts stay with the design authority.