SS 316L vs Duplex 2205 difference in composition & properties.
SS 316L is austenitic stainless; Duplex 2205 is duplex stainless. Molybdenum: Duplex 2205 3–3.5% against SS 316L 2–3%.
Key differences between SS 316L and Duplex 2205
- SS 316L is austenitic stainless; Duplex 2205 is duplex stainless.
- Molybdenum: Duplex 2205 3–3.5% against SS 316L 2–3%.
- Nickel: SS 316L 10–14% against Duplex 2205 4.5–6.5%.
- Chromium: Duplex 2205 22–23% against SS 316L 16–18%.
- Duplex 2205 contains nitrogen (0.14–0.2%); SS 316L has no minimum for it (≤0.1%).
- Density: SS 316L 7.98 g/cm³, Duplex 2205 7.82 g/cm³.
SS 316L vs Duplex 2205 chemical composition (weight %)
| Element | SS 316L | Duplex 2205 |
|---|---|---|
| C | ≤0.03 | ≤0.03 |
| Si | ≤0.75 | ≤1 |
| Mn | ≤2 | ≤2 |
| P | ≤0.045 | ≤0.03 |
| S | ≤0.03 | ≤0.02 |
| Cr | 16–18 | 22–23 |
| Ni | 10–14 | 4.5–6.5 |
| Mo | 2–3 | 3–3.5 |
| N | ≤0.1 | 0.14–0.2 |
Mechanical properties, equivalents and uses
| Property | SS 316L | Duplex 2205 |
|---|---|---|
| Family | Austenitic stainless | Duplex stainless |
| Tensile strength, MPa | ≥485 | ≥655 |
| Yield strength, MPa | ≥170 | ≥450 |
| Elongation, % | ≥40 | ≥25 |
| Hardness | ≤217 HB | ≤293 HB |
| Density, g/cm³ | 7.98 | 7.82 |
| UNS | S31603 | S32205 / S31803 |
| EN | X2CrNiMo17-12-2 | X2CrNiMoN22-5-3 |
| W.Nr | 1.4404 | 1.4462 |
| JIS | SUS316L | SUS329J3L |
| IS (India) | X02Cr17Ni12Mo2 (IS 6911) | – |
| AISI / ASTM | AISI 316L | 2205 (ASTM A240) · ASTM A182 F51 (S31803) / F60 (S32205) |
| Typical uses | Welded process piping, pharma, food, offshore | Offshore, desalination, chemical tankers |
Mechanical values: Annealed plate, sheet, strip (ASTM A240 / ASME SA240) / Solution annealed plate (ASTM A240 / ASME SA240 S32205). Limits vary by standard and product form; confirm against your purchase specification.
Frequently asked questions
What is the difference between SS 316L and Duplex 2205?
SS 316L is austenitic stainless; Duplex 2205 is duplex stainless. Molybdenum: Duplex 2205 3–3.5% against SS 316L 2–3%. Nickel: SS 316L 10–14% against Duplex 2205 4.5–6.5%. Chromium: Duplex 2205 22–23% against SS 316L 16–18%.
Where are SS 316L and Duplex 2205 used?
SS 316L: Welded process piping, pharma, food, offshore. Duplex 2205: Offshore, desalination, chemical tankers.
Can Duplex 2205 replace SS 316L?
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.
More tools
Can’t find your grade? Send it — we’ll source it.
Our stockist and mill sourcing network extends beyond the grades listed here. Send rare grades, unusual forms and small-quantity requirements for sourcing review.
One enquiry gives us the details to check suitable sources across the network and help move your purchase forward. Share the exact grade, standard, form, size, quantity, delivery town and required date. We’ll confirm availability, minimum order quantity and lead time against your requirement.
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.