2507 (S32750)
UNS S32750
Overview
Super duplex stainless steel with enhanced chromium, molybdenum, and nitrogen content. Offers significantly higher strength and corrosion resistance than standard 2205. PREN ≥ 40 makes it suitable for the most aggressive chloride environments including hot seawater and sour well conditions. The ultimate alloy for critical offshore and subsea applications.
Chemical Composition (wt%)
| Element | Min | Max |
|---|---|---|
| C (Carbon) | — | 0.03 |
| Mn (Manganese) | — | 1.2 |
| Si (Silicon) | — | 0.8 |
| P (Phosphorus) | — | 0.035 |
| S (Sulfur) | — | 0.02 |
| Cr (Chromium) | 24 | 26 |
| Ni (Nickel) | 6 | 8 |
| Mo (Molybdenum) | 3 | 5 |
| N (Nitrogen) | 0.24 | 0.32 |
Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | ≥ 800 MPa (116 ksi) | — |
| Yield Strength (0.2%) | ≥ 550 MPa (80 ksi) | — |
| Elongation | ≥ 15% | — |
| Hardness | ≤ 32 HRC / ≤ 310 HB | annealed |
| Density | 7.8 g/cm³ | — |
Physical Properties
| Property | Value |
|---|---|
| Melting Range | 1350 – 1425 °C |
| Thermal Conductivity | 17 W/m·K (at 100°C) |
| PREN | 40 – 43 |
Corrosion Resistance
Outstanding resistance to chloride pitting (PREN ≥ 40) and crevice corrosion. Excellent performance in hot seawater, brine, and sour gas environments. Resistant to stress corrosion cracking even at elevated temperatures. Performs well in oxidizing and reducing acids. The go-to alloy for critical seawater-cooled heat exchangers and deep-water umbilicals.
Typical Applications
Related Standards
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