Duplex 2205 vs Super Duplex 2507 difference in composition & properties.
Molybdenum: Super Duplex 2507 3–5% against Duplex 2205 3–3.5%. Nickel: Super Duplex 2507 6–8% against Duplex 2205 4.5–6.5%.
Key differences between Duplex 2205 and Super Duplex 2507
- Molybdenum: Super Duplex 2507 3–5% against Duplex 2205 3–3.5%.
- Nickel: Super Duplex 2507 6–8% against Duplex 2205 4.5–6.5%.
- Nitrogen: Super Duplex 2507 0.24–0.32% against Duplex 2205 0.14–0.2%.
- Density: Duplex 2205 7.82 g/cm³, Super Duplex 2507 7.8 g/cm³.
Duplex 2205 vs Super Duplex 2507 chemical composition (weight %)
| Element | Duplex 2205 | Super Duplex 2507 |
|---|---|---|
| C | ≤0.03 | ≤0.03 |
| Si | ≤1 | ≤0.8 |
| Mn | ≤2 | ≤1.2 |
| P | ≤0.03 | ≤0.035 |
| S | ≤0.02 | ≤0.02 |
| Cr | 22–23 | 24–26 |
| Ni | 4.5–6.5 | 6–8 |
| Mo | 3–3.5 | 3–5 |
| N | 0.14–0.2 | 0.24–0.32 |
| Cu | – | ≤0.5 |
Mechanical properties, equivalents and uses
| Property | Duplex 2205 | Super Duplex 2507 |
|---|---|---|
| Family | Duplex stainless | Duplex stainless |
| Tensile strength, MPa | ≥655 | ≥795 |
| Yield strength, MPa | ≥450 | ≥550 |
| Elongation, % | ≥25 | ≥15 |
| Hardness | ≤293 HB | ≤310 HB |
| Density, g/cm³ | 7.82 | 7.8 |
| UNS | S32205 / S31803 | S32750 |
| EN | X2CrNiMoN22-5-3 | X2CrNiMoN25-7-4 |
| W.Nr | 1.4462 | 1.4410 |
| JIS | SUS329J3L | SUS327L1 |
| AISI / ASTM | 2205 (ASTM A240) · ASTM A182 F51 (S31803) / F60 (S32205) | 2507 (ASTM A240) · ASTM A182 F53 |
| Typical uses | Offshore, desalination, chemical tankers | Seawater, subsea, high-chloride process |
Mechanical values: Solution annealed plate (ASTM A240 / ASME SA240 S32205) / Solution annealed plate (ASTM A240 / ASME SA240 S32750). Limits vary by standard and product form; confirm against your purchase specification.
Frequently asked questions
What is the difference between Duplex 2205 and Super Duplex 2507?
Molybdenum: Super Duplex 2507 3–5% against Duplex 2205 3–3.5%. Nickel: Super Duplex 2507 6–8% against Duplex 2205 4.5–6.5%. Nitrogen: Super Duplex 2507 0.24–0.32% against Duplex 2205 0.14–0.2%. Density: Duplex 2205 7.82 g/cm³, Super Duplex 2507 7.8 g/cm³.
Where are Duplex 2205 and Super Duplex 2507 used?
Duplex 2205: Offshore, desalination, chemical tankers. Super Duplex 2507: Seawater, subsea, high-chloride process.
Can Super Duplex 2507 replace Duplex 2205?
Only if the purchase specification allows it. Check the governing standard, chemistry limits and mechanical properties against the order, and confirm on the mill test certificate.
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Mill test certificate (EN 10204 3.1) supplied with material; third-party inspection on request.
Reference basis: Compiled by Steel Impex India. Check each table’s source, product form and delivery condition before use. Sources, calculation methods and corrections.