Super Duplex 2507 Flange ASTM A182 F53 UNS S32750 Super Duplex Weld Neck Flange
ASTM A182 F53 / UNS 32750 / Super Duplex 2507 Weld Neck Flange WNRF Flange
Specialized Corrosion Resistance of ASTM A182 F53 Super Duplex Steel Flange Weld Neck Flange
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Erosion-Corrosion: Performs well in high-velocity seawater (e.g., subsea pipelines) due to combined resistance to mechanical wear and chloride attack.
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Stress Corrosion Cracking (SCC): Resists SCC in chloride-rich, high-temperature environments (e.g., geothermal brines), unlike austenitic steels like 316L.
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Hydrogen Embrittlement: Less prone than martensitic steels but requires caution in sour (H₂S) environments. Compliant with NACE TM0177 (tensile testing in H₂S).
Chemical Composition of ASTM A182 F53 Super Duplex Steel Flange Weld Neck Flange
| Weight% | C | Mn | P | S | Si | Cr | Ni | Mo | N | Cu |
| Super Duplex F53 | 0.03 max | 1.2 max | 0.035 max | 0.015 max | 0.8 max | 24-26 | 6-8 | 3-5 | 0.24-0.32 | 0.5 max |
Mechanical properties of ASTM A182 F53 Super Duplex Steel Flange Weld Neck Flange
| Alloy | Tensile Strength ksi | Proof Strength 0.2% ksi (min) |
Elongation (%) (min) |
Elongation (%) (min) |
| Super Duplex F53 Annealed Condition |
110-135 |
80 |
15 |
16 |
| ASME B16.5 Super Duplex 2507 Flanges | EN TYPE | DIN |
|
WN – Welding Neck |
EN-TYPE 11 |
DIN 2631 |
| DIN 2632 | ||
| DIN 2633 | ||
| DIN 2634 | ||
| DIN 2635 | ||
| BL – Blind | EN-TYPE 05 | DIN 2527 |
| SO – Slip On | EN-TYPE 01/12 | |
|
LJ – Lap Joint |
EN-TYPE 02/04 |
DIN 2641 |
| DIN 2642 | ||
| DIN 2655 | ||
| DIN 2656 | ||
| LWN – Long Welding Neck / Integral | EN-TYPE 21 | |
| Welding Collars | EN-TYPE 32/34 | |
| Super Duplex 2507 Flat Flange for Welding | DIN 2573 | |
| DIN 2576 | ||
| SW – Socket Weld | EN-TYPE 14 | |
| THR – Threaded | EN-TYPE 13 | DIN 2566 |
| Super Duplex 2507 Lap Joint Short Stub End | DIN 2673 | |
| Super Duplex Steel 2507 Orifice Flanges, Super Duplex SS 2507 Swivel Flanges, Spades, Spacer Rings Super Duplex 2507 F55 Spectable Blinds, API 6A, JIS B2220, VSM, NFE, BS10/BS4504, GOST |
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Comparative Advantages Over Alternatives
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vs. Duplex 2205 (F51/S32205): Higher Cr, Mo, and N content in 2507 provides superior pitting resistance (PREN 42 vs. 35) and strength (550 MPa vs. 450 MPa yield).
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vs. Titanium: Lower cost (~50% less) and better thermal conductivity, though less resistant to reducing acids like HCl.
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vs. Nickel Alloys (e.g., Hastelloy): More cost-effective for chloride environments but unsuitable for highly oxidizing conditions (e.g., hot nitric acid).
Application
- Oil and gas exploration: Subsea pipelines, Christmas trees, manifolds.
- Chemical processing plants:HCl, H₂S, and chloride-rich environments.
- Marine applications: onshore & offshore engineering.
- Power generation:Flue gas desulfurization (FGD) systems.
- Desalination Plants: Seawater reverse osmosis systems.
NO CRACK (PT TEST)
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