2205 (S31803 / S32205)
UNS S31803 / S32205
Overview
The most widely used duplex stainless steel. Offers roughly double the yield strength of 316L with superior chloride stress corrosion cracking resistance. The perfect balance of strength, corrosion resistance, and cost for offshore, chemical, and desalination applications. S32205 (enhanced) has tighter chemistry for improved corrosion properties.
Chemical Composition (wt%)
| Element | Min | Max |
|---|---|---|
| C (Carbon) | — | 0.03 |
| Mn (Manganese) | — | 2 |
| Si (Silicon) | — | 1 |
| P (Phosphorus) | — | 0.03 |
| S (Sulfur) | — | 0.02 |
| Cr (Chromium) | 21 | 23 |
| Ni (Nickel) | 4.5 | 6.5 |
| Mo (Molybdenum) | 2.5 | 3.5 |
| N (Nitrogen) | 0.08 | 0.2 |
Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | ≥ 655 MPa (95 ksi) | — |
| Yield Strength (0.2%) | ≥ 450 MPa (65 ksi) | — |
| Elongation | ≥ 25% | — |
| Hardness | ≤ 31 HRC / ≤ 293 HB | annealed |
| Density | 7.85 g/cm³ | — |
Physical Properties
| Property | Value |
|---|---|
| Melting Range | 1350 – 1445 °C |
| Thermal Conductivity | 19 W/m·K (at 100°C) |
| PREN | 34 – 35 (S32205) |
Corrosion Resistance
Excellent resistance to chloride stress corrosion cracking (SCC) — a major advantage over standard austenitic grades. Good pitting and crevice corrosion resistance (PREN 34-35). Performs well in seawater, brine, and sour service (H₂S) environments up to NACE MR0175 limits. Not recommended for continuous service above 300°C due to 475°C embrittlement risk.
Typical Applications
Related Standards
Available Products in This Material
Browse our product range manufactured in 2205 (S31803 / S32205):