F53 Duplex Steel Flanges (also called Super Duplex 2507) are high-performance pipe connectors designed for extreme corrosion resistance and mechanical strength. Combining austenitic and ferritic microstructures, they offer twice the yield strength of 316L while maintaining excellent resistance to chlorides, acids, and stress corrosion cracking (SCC).
Key Features & Benefits
Exceptional Corrosion Resistance
Withstands seawater, chlorides (up to 100,000 ppm), and acidic media (H₂SO₄, HCl).
Superior to 316L in pitting/crevice corrosion (PREN ≥ 40 vs. 316L’s 25).
High Strength & Lightweight
Yield strength: 550 MPa (vs. 220 MPa for 316L) – allows thinner, lighter flanges.
Ideal for subsea, offshore, and high-pressure systems.
Cost-Effective vs. Nickel Alloys
Cheaper than Inconel/Hastelloy but outperforms them in many chloride-rich environments.
Weldability
Requires low heat input and 2205/2507 filler metals (e.g., ER2594).
Material Standards & Grades
| Standard | Grade | UNS No. | Equivalent |
|---|---|---|---|
| ASTM A182 | F53 | S32750 | EN 1.4410, Zeron 100 |
| ASTM A790 | S32750 | – | Super Duplex 2507 |
| NORSOK MDS D56 | – | – | Approved for offshore |
Flange Types & Applications
Common Types
Weld Neck (WN) – High-pressure subsea pipelines.
Socket Weld (SW) – Compact chemical processing lines.
Lap Joint (LJ) – Frequent disassembly systems.
Key Applications
✔ Oil & Gas – Subsea manifolds, sour gas injection.
✔ Desalination Plants – Seawater reverse osmosis (SWRO).
✔ Chemical Processing – HCl pickling tanks, sulfuric acid coolers.
✔ Pulp & Paper – Bleaching equipment.
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