2205 Duplex vs 2507 Super 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.
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
2507 Super Duplex
Stainless Steel
2507 is a super duplex stainless with 25% chromium, 4% molybdenum and high nitrogen, giving a PREN above 40 and outstanding resistance to pitting, crevice corrosion and chloride stress corrosion in seawater and offshore service.
Standards: DIN 1.4410 · AISI UNS S32750 · GB 022Cr25Ni7Mo4N
Chemical composition compared (%)
| Element | 2205 Duplex | 2507 Super Duplex |
|---|---|---|
| C | ≤0.030 | ≤0.030 |
| Si | ≤1.00 | ≤0.80 |
| Mn | ≤2.00 | ≤1.20 |
| P | ≤0.030 | ≤0.035 |
| S | ≤0.020 | ≤0.020 |
| Cr | 22.00–23.00 | 24.00–26.00 |
| Ni | 4.50–6.50 | 6.00–8.00 |
| Mo | 3.00–3.50 | 3.00–5.00 |
| N | 0.14–0.20 | 0.24–0.32 |
| Cu | — | ≤0.50 |
Properties compared
| Property | 2205 Duplex | 2507 Super Duplex |
|---|---|---|
| Delivery condition | Solution annealed | Solution annealed |
| Hardness | ≤293 HB | ≤310 HB |
| Tensile strength | 655–880 MPa | 795–1000 MPa |
| Yield strength | ≥450 MPa | ≥550 MPa |
| Density | 7.80 g/cm³ | 7.80 g/cm³ |
| Magnetic | Yes | Yes |
| PREN | ~35 | ≥40 |
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: 2205 Duplex · 2507 Super Duplex. Substitution decisions for certified parts stay with the design authority.