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Technical Features and Metallurgy
Duplex forgings are defined by their PREn (Pitting Resistance Equivalent number).
| Grade | PREn Value | Typical Application |
|---|---|---|
| F51 (2205) | >34 | Standard corrosive chemical processing. |
| F53 (2507) | >40 | Deepwater subsea and high-salinity environments. |
| F55 (Zeron 100) | >40 | Extreme sour gas and sulfuric acid service. |
Forging duplex steel requires precise temperature control. If forged too cold, the material will crack; if forged too hot, the phase balance is destroyed. We utilize computer-controlled furnaces to ensure every forging undergoes the exact solution annealing and water quenching required to lock in its corrosion-resistant properties.
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Buying Tips for High-Alloy Projects
- Ferrite Content Testing: Always request a "Ferrite Scope" test or metallurgical lab report to verify the ferrite percentage is between 35% and 65%.
- Corrosion Testing: For offshore use, specify ASTM G48 Method A testing to ensure the forging can resist pitting in ferric chloride solutions.
- Surface Passivation: Ensure the forgings are properly pickled and passivated after machining to restore the protective chromium oxide layer.
Advantages of Forged Duplex
| Advantage | Operational Benefit |
|---|---|
| Weight Reduction | Higher yield strength allows for thinner-walled, lighter components. |
| SCC Resistance | Immune to the cracking that kills 300-series steel in salt spray. |
| Erosion Resistance | Harder surface handles high-velocity "sandy" fluids better than 316L. |
Primary Applications
| Industry | Usage Context |
|---|---|
| Desalination | High-pressure pump bodies and brine manifolds. |
| Subsea O&G | Choke valves and umbilical connectors. |
| Chemical | Heat exchanger tube sheets and pressure vessel nozzles. |
- Q: What is "Super Duplex"?
- A: It refers to duplex alloys with a PREn value greater than 40, offering even higher resistance to pitting and crevice corrosion in seawater.
