ASTM A790 Duplex & Super Duplex Pipe
ASTM A790 covers seamless and straight-seam welded ferritic/austenitic duplex and super duplex stainless steel pipe intended for general corrosive service, with particular emphasis on resistance to stress corrosion cracking in chloride environments.
Material Quick Reference
| Material Classification | Seamless & Welded Ferritic/Austenitic Duplex Stainless Steel Pipe |
|---|---|
| Pitting Resistance (PREN) | 34 - 43 |
| Temperature Limits | -50°C to +280°C |
| Governing Specifications | ASTM A790, ASME SA790, NACE MR0175, NORSOK M-601 |
Typical Engineering Applications
- SWRO desalination high-pressure membranes and headers
- Offshore process piping and firewater ring mains
- Sour gas gathering lines
- Petrochemical heat exchanger piping
Chemical Environment & Corrosion Resistance
Exceptional resistance to chloride stress corrosion cracking, pitting, and erosion-corrosion.
Performance in Qatar's Coastal & Industrial Climate
The core specification for all critical desalination and offshore piping systems in Qatar.
Welding & Fabrication Guidelines
Welded with ER2209 or ER2594 wire with controlled heat input and argon-nitrogen backing purge.
Positive Material Identification (PMI) Requirements
XRF verification of Cr, Ni, Mo, N; Ferrite test per ASTM E562.
Key Advantages
- Twice the yield strength of 316L
- Outstanding chloride SCC immunity
Engineering Limitations
- Maximum operating temperature limited to 280°C
Related Products & Contracting Services
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