Duplex 2205 vs SS 316 difference in composition & properties.
Duplex 2205 is duplex stainless; SS 316 is austenitic stainless. Molybdenum: Duplex 2205 3–3.5% against SS 316 2–3%.
Duplex 2205 or 316?
Duplex 2205 has roughly twice the yield strength of 316 and much better resistance to chloride pitting and stress-corrosion cracking, so thinner sections can be used in sea water, desalination, oil and gas and chemical plants. 316 is easier to fabricate and suits milder duty.
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Key differences between Duplex 2205 and SS 316
- Duplex 2205 is duplex stainless; SS 316 is austenitic stainless.
- Molybdenum: Duplex 2205 3–3.5% against SS 316 2–3%.
- Nickel: SS 316 10–14% against Duplex 2205 4.5–6.5%.
- Chromium: Duplex 2205 22–23% against SS 316 16–18%.
- Carbon: SS 316 ≤0.08% against Duplex 2205 ≤0.03%.
- Duplex 2205 contains nitrogen (0.14–0.2%); SS 316 has no minimum for it (≤0.1%).
- Density: Duplex 2205 7.82 g/cm³, SS 316 7.98 g/cm³.
Duplex 2205 vs SS 316 chemical composition (weight %)
| Element | Duplex 2205 | SS 316 |
|---|---|---|
| C | ≤0.03 | ≤0.08 |
| Si | ≤1 | ≤0.75 |
| Mn | ≤2 | ≤2 |
| P | ≤0.03 | ≤0.045 |
| S | ≤0.02 | ≤0.03 |
| Cr | 22–23 | 16–18 |
| Ni | 4.5–6.5 | 10–14 |
| Mo | 3–3.5 | 2–3 |
| N | 0.14–0.2 | ≤0.1 |
Mechanical properties, equivalents and uses
| Property | Duplex 2205 | SS 316 |
|---|---|---|
| Family | Duplex stainless | Austenitic stainless |
| Tensile strength, MPa | ≥655 | ≥515 |
| Yield strength, MPa | ≥450 | ≥205 |
| Elongation, % | ≥25 | ≥40 |
| Hardness | ≤293 HB | ≤217 HB |
| Density, g/cm³ | 7.82 | 7.98 |
| UNS | S32205 / S31803 | S31600 |
| EN | X2CrNiMoN22-5-3 | X5CrNiMo17-12-2 |
| W.Nr | 1.4462 | 1.4401 |
| JIS | SUS329J3L | SUS316 |
| IS (India) | – | X04Cr17Ni12Mo2 (IS 6911) |
| AISI / ASTM | 2205 (ASTM A240) · ASTM A182 F51 (S31803) / F60 (S32205) | AISI 316 |
| Typical uses | Offshore, desalination, chemical tankers | Chemical, marine, pharma, chloride service |
Mechanical values: Solution annealed plate (ASTM A240 / ASME SA240 S32205) / Annealed plate, sheet, strip (ASTM A240 / ASME SA240). Limits vary by standard and product form; confirm against your purchase specification.
Frequently asked questions
What is the difference between Duplex 2205 and SS 316?
Duplex 2205 is duplex stainless; SS 316 is austenitic stainless. Molybdenum: Duplex 2205 3–3.5% against SS 316 2–3%. Nickel: SS 316 10–14% against Duplex 2205 4.5–6.5%. Chromium: Duplex 2205 22–23% against SS 316 16–18%.
Where are Duplex 2205 and SS 316 used?
Duplex 2205: Offshore, desalination, chemical tankers. SS 316: Chemical, marine, pharma, chloride service.
Can SS 316 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.