Super Duplex 2507 (UNS S32750)
Super Duplex 2507 is an ultra-high performance alloy engineered for exceptionally aggressive chloride and acidic environments. With a Pitting Resistance Equivalent Number (PREN) exceeding 42 and yield strength exceeding 550 MPa, it withstands warm seawater and severe sour gas service.
Material Quick Reference
| Material Classification | Super Duplex Stainless Steel (25% Cr, 7% Ni, 4% Mo, 0.28% N) |
|---|---|
| Pitting Resistance (PREN) | >= 42 |
| Temperature Limits | -50°C to +250°C |
| Governing Specifications | ASTM A790 UNS S32750, ASTM A815 WPS32750, ASTM A182 F53, NORSOK M-601 / M-630 |
Typical Engineering Applications
- Warm raw seawater intake and brine concentration lines in desalination plants
- High-pressure subsea flowlines and manifold spools
- Aggressive sulfuric and phosphoric acid processes
- Flue gas cleaning and offshore firewater deluge systems
Chemical Environment & Corrosion Resistance
Immune to chloride stress corrosion cracking in seawater up to 60°C; outstanding resistance to organic and inorganic acids.
Performance in Qatar's Coastal & Industrial Climate
Critical for Qatar SWRO desalination facilities where seawater temperatures exceed 35°C during summer months.
Welding & Fabrication Guidelines
Welded via GTAW with ER2594 filler wire and 99.999% argon + 2% nitrogen backing gas to compensate for nitrogen loss in the weld root.
Positive Material Identification (PMI) Requirements
XRF verification: 25% Cr, 7% Ni, 4% Mo; Microstructural metallographic examination for absence of intermetallic phases per ASTM A923 Method C.
Key Advantages
- PREN >= 42 provides exceptional pitting and crevice corrosion immunity
- Exceptional yield strength (> 550 MPa)
Engineering Limitations
- Stringent welding heat input control required to prevent deleterious intermetallic sigma (σ) and chi (χ) phases
Related Products & Contracting Services
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