Duplex 2205 vs Inconel 625 difference in composition & properties.
Duplex 2205 is duplex stainless; Inconel 625 is nickel alloy. Molybdenum: Inconel 625 8–10% against Duplex 2205 3–3.5%.
Key differences between Duplex 2205 and Inconel 625
- Duplex 2205 is duplex stainless; Inconel 625 is nickel alloy.
- Molybdenum: Inconel 625 8–10% against Duplex 2205 3–3.5%.
- Nickel: Inconel 625 ≥58% against Duplex 2205 4.5–6.5%.
- Carbon: Inconel 625 ≤0.1% against Duplex 2205 ≤0.03%.
- Manganese: Duplex 2205 ≤2% against Inconel 625 ≤0.5%.
- Duplex 2205 contains nitrogen (0.14–0.2%); Inconel 625 has no minimum for it.
- Density: Duplex 2205 7.82 g/cm³, Inconel 625 8.44 g/cm³.
Duplex 2205 vs Inconel 625 chemical composition (weight %)
| Element | Duplex 2205 | Inconel 625 |
|---|---|---|
| C | ≤0.03 | ≤0.1 |
| Si | ≤1 | ≤0.5 |
| Mn | ≤2 | ≤0.5 |
| P | ≤0.03 | ≤0.015 |
| S | ≤0.02 | ≤0.015 |
| Cr | 22–23 | 20–23 |
| Ni | 4.5–6.5 | ≥58 |
| Mo | 3–3.5 | 8–10 |
| N | 0.14–0.2 | – |
| Nb+Ta | – | 3.15–4.15 |
| Fe | – | ≤5 |
| Co | – | ≤1 |
| Al | – | ≤0.4 |
| Ti | – | ≤0.4 |
Mechanical properties, equivalents and uses
| Property | Duplex 2205 | Inconel 625 |
|---|---|---|
| Family | Duplex stainless | Nickel alloy |
| Tensile strength, MPa | ≥655 | ≥827 |
| Yield strength, MPa | ≥450 | ≥414 |
| Elongation, % | ≥25 | – |
| Hardness | ≤293 HB | – |
| Density, g/cm³ | 7.82 | 8.44 |
| UNS | S32205 / S31803 | N06625 |
| EN | X2CrNiMoN22-5-3 | NiCr22Mo9Nb |
| W.Nr | 1.4462 | 2.4856 |
| JIS | SUS329J3L | NCF625 |
| AISI / ASTM | 2205 (ASTM A240) · ASTM A182 F51 (S31803) / F60 (S32205) | Alloy 625 |
| Typical uses | Offshore, desalination, chemical tankers | Offshore, flue gas, aerospace, chemical |
Mechanical values: Solution annealed plate (ASTM A240 / ASME SA240 S32205) / Grade 1. Limits vary by standard and product form; confirm against your purchase specification.
Frequently asked questions
What is the difference between Duplex 2205 and Inconel 625?
Duplex 2205 is duplex stainless; Inconel 625 is nickel alloy. Molybdenum: Inconel 625 8–10% against Duplex 2205 3–3.5%. Nickel: Inconel 625 ≥58% against Duplex 2205 4.5–6.5%. Carbon: Inconel 625 ≤0.1% against Duplex 2205 ≤0.03%.
Where are Duplex 2205 and Inconel 625 used?
Duplex 2205: Offshore, desalination, chemical tankers. Inconel 625: Offshore, flue gas, aerospace, chemical.
Can Inconel 625 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.