Duplex S31803 vs Duplex 2205 (S32205)
Duplex S31803 (UNS S31803) vs Duplex 2205 (S32205) (UNS S32205): chemical composition and mechanical properties side by side.
- Strength: Duplex 2205 (S32205) minimum yield is 450 MPa vs 450 MPa for Duplex S31803 (+0%); tensile 655 vs 620 MPa.
- Density: 7.8 vs 7.8 g/cm³ — same weight for the same dimensions.
- Pitting resistance (PREN, min): 30.5 vs 34.1 — higher for Duplex 2205 (S32205).
- Typical use: Duplex S31803 — Original 2205 chemistry. Duplex 2205 (S32205) — Tighter, higher-PREN 2205.
| Property | Duplex S31803 | Duplex 2205 (S32205) |
|---|---|---|
| Family | Duplex stainless | Duplex stainless |
| UNS | S31803 | S32205 |
| EN / W.Nr | 1.4462 X2CrNiMoN22-5-3 | 1.4462 X2CrNiMoN22-5-3 |
| Basis spec | ASTM A240 | ASTM A240 |
| Density g/cm³ | 7.8 | 7.8 |
| Chemical composition, % | ||
| C | 0.030 | 0.030 |
| Mn | 2.00 | 2.00 |
| P | 0.030 | 0.030 |
| S | 0.020 | 0.020 |
| Si | 1.00 | 1.00 |
| Cr | 21.0–23.0 | 22.0–23.0 |
| Ni | 4.5–6.5 | 4.5–6.5 |
| Mo | 2.5–3.5 | 3.0–3.5 |
| N | 0.08–0.20 | 0.14–0.20 |
| Mechanical properties (min) | ||
| Tensile strength | 620 MPa (90 ksi) | 655 MPa (95 ksi) |
| Yield strength (0.2%) | 450 MPa (65 ksi) | 450 MPa (65 ksi) |
| Elongation | 25% | 25% |
| Hardness (max) | 293 HB | 293 HB |
| PREN (min, from spec) | 30.5 | 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 Duplex S31803 and Duplex 2205 (S32205)?
Strength: Duplex 2205 (S32205) minimum yield is 450 MPa vs 450 MPa for Duplex S31803 (+0%); tensile 655 vs 620 MPa. Density: 7.8 vs 7.8 g/cm³ — same weight for the same dimensions. Pitting resistance (PREN, min): 30.5 vs 34.1 — higher for Duplex 2205 (S32205).
Which is stronger, Duplex S31803 or Duplex 2205 (S32205)?
Duplex S31803 has the higher minimum yield strength (450 MPa vs 450 MPa).
Last updated 2026-11-02