SS 316L vs Duplex 2205 (S32205)
SS 316L (UNS S31603) vs Duplex 2205 (S32205) (UNS S32205): chemical composition and mechanical properties side by side.
- Strength: Duplex 2205 (S32205) minimum yield is 450 MPa vs 170 MPa for SS 316L (+165%); tensile 655 vs 485 MPa.
- Density: 7.98 vs 7.8 g/cm³ — SS 316L is 2.3% heavier.
- Pitting resistance (PREN, min): 22.6 vs 34.1 — higher for Duplex 2205 (S32205).
- Typical use: SS 316L — Most specified process stainless. Duplex 2205 (S32205) — Tighter, higher-PREN 2205.
| Property | SS 316L | Duplex 2205 (S32205) |
|---|---|---|
| Family | Austenitic stainless | Duplex stainless |
| UNS | S31603 | S32205 |
| EN / W.Nr | 1.4404 X2CrNiMo17-12-2 | 1.4462 X2CrNiMoN22-5-3 |
| Basis spec | ASTM A240 | ASTM A240 |
| Density g/cm³ | 7.98 | 7.8 |
| Chemical composition, % | ||
| C | 0.030 | 0.030 |
| Mn | 2.00 | 2.00 |
| P | 0.045 | 0.030 |
| S | 0.030 | 0.020 |
| Si | 0.75 | 1.00 |
| Cr | 16.0–18.0 | 22.0–23.0 |
| Ni | 10.0–14.0 | 4.5–6.5 |
| Mo | 2.00–3.00 | 3.0–3.5 |
| N | 0.10 | 0.14–0.20 |
| Mechanical properties (min) | ||
| Tensile strength | 485 MPa (70 ksi) | 655 MPa (95 ksi) |
| Yield strength (0.2%) | 170 MPa (25 ksi) | 450 MPa (65 ksi) |
| Elongation | 40% | 25% |
| Hardness (max) | 217 HB | 293 HB |
| PREN (min, from spec) | 22.6 | 34.1 |
Single values are maximums; ranges are min–max; "bal" = balance. Limits are typical of the basis specification for that product form — forgings, pipe and fittings specifications differ slightly. Always check the exact specification, edition and the mill test certificate.
Frequently asked questions
What is the difference between SS 316L and Duplex 2205 (S32205)?
Strength: Duplex 2205 (S32205) minimum yield is 450 MPa vs 170 MPa for SS 316L (+165%); tensile 655 vs 485 MPa. Density: 7.98 vs 7.8 g/cm³ — SS 316L is 2.3% heavier. Pitting resistance (PREN, min): 22.6 vs 34.1 — higher for Duplex 2205 (S32205).
Which is stronger, SS 316L or Duplex 2205 (S32205)?
Duplex 2205 (S32205) has the higher minimum yield strength (450 MPa vs 170 MPa).
Last updated 2026-11-02