SDX 2507 (UNS S32750) Super Duplex Stainless Steel: Specifications And Applications
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If you are looking for a high-performance stainless steel material for pressure vessels, heat exchangers, or offshore piping systems, SDX 2507 (UNS S32750 / EN 1.4410 / ASTM F53) is one of the most reliable options available today.
SDX 2507 super duplex stainless steel offers outstanding corrosion resistance, mechanical strength, and durability under harsh conditions such as seawater, chemical processing, and high-pressure environments.
What is SDX 2507 (UNS S32750) Super Duplex Stainless Steel?
SDX 2507, also known as UNS S32750, EN 1.4410, or ASTM F53, is a super duplex stainless steel designed for extreme strength and exceptional corrosion resistance. It is part of the duplex family of stainless steels, which have a balanced microstructure of austenite (50%) and ferrite (50%) - combining the best mechanical and corrosion-resistant properties of both.
This grade is widely used in offshore oil and gas, desalination, chemical processing, and marine applications, where standard stainless steels like 304 or 316 would fail due to pitting or stress corrosion cracking in chloride-rich environmen
SDX 2507 (UNS S32750 / 1.4410 / F53) Specification
| Category | Specification |
|---|---|
| Material | SDX 2507 (Super Duplex, UNS S32750 / 1.4410 / F53) |
| Applicable Standards | Plates – EN 10028-7 Flanges – EN 1092-1 / ASME B16.5 Pipes – ASTM A790 Heads – ASME Sec VIII Div 1 |
| Heat Treatment | Solution annealed and water quenched; ferrite content 35–65% (documented) |
| Testing | PMI, UT (for plates/flanges), RT (100% for heads), dimensional inspection |
| Certification | EN 10204 Type 3.1 MTC (mandatory); Type 3.2 available upon request |
| Surface Finish | Pickled or 320-grit polished; SA 2.5 blast optional |
| End Preparation | Bevel 37.5°, no welding on plates or rings |
| Tolerances | OD ±2 mm, thickness ±1 mm, ovality < 1 mm per 100 mm diameter |
| Marking | Material grade, heat number, standard, supplier name |
| Packaging | Seaworthy wooden crate, anti-corrosion wrapping |
| Delivery Term | CIF Istanbul Port (Turkey) |
| Documentation | MTC (EN 10204 3.1), inspection reports, RT/UT records, dimensional check sheet, photos of similar production |
Why choose SDX 2507 stainless steel over 316L or 904L stainless steel?
SDX 2507 offers superior strength and corrosion resistance, particularly to chloride corrosion. It performs better in offshore and chemical plant environments, resulting in longer service life and lower maintenance costs.
What is the ferrite content of S32750?
The ferrite phase is maintained between 35-65%, ensuring a stable duplex microstructure for optimal mechanical properties.
Is SDX 2507 easily weldable?
Yes, it can be welded using conventional stainless steel processes. However, controlling heat input is crucial to maintain phase balance.
Applications of SDX 2507
| Industry | Application |
|---|---|
| Oil & Gas | Offshore platforms, subsea pipelines, manifolds |
| Marine & Desalination | Seawater piping, heat exchangers, evaporators |
| Chemical Processing | Pressure vessels, reactors, scrubbers |
| Power Generation | Condensers, cooling systems |
| Pulp & Paper | Bleaching and digester equipment |
| Food & Beverage | Saltwater processing and brine systems |
Comparison with Other Stainless Steels
| Grade | Type | PREN | Yield Strength (MPa) | Key Property |
|---|---|---|---|---|
| 316L (1.4404) | Austenitic | ~25 | 220 | Good corrosion resistance |
| 2205 (1.4462) | Duplex | ~35 | 450 | Balanced corrosion & strength |
| 2507 (1.4410) | Super Duplex | ≥ 40 | 550+ | Excellent corrosion & strength |
| 904L (1.4539) | Austenitic | ~36 | 240 | Acid-resistant, but lower strength |
Why Choose Gnee for SDX 2507?
Gnee Stainless Steel supplies certified SDX 2507 (UNS S32750 / 1.4410) materials with full traceability and inspection reports:
✅ EN 10204 3.1 or 3.2 MTC certification
✅ PMI, UT, RT, and dimensional testing
✅ Solution annealed and water quenched
✅ Pickled or 320-grit polished finishes
✅ CIF, FOB, or DDU delivery worldwide
✅ Flexible payment terms (T/T, L/C)
All products are packaged in seaworthy wooden crates with anti-corrosion wrapping for safe international shipment.
| Form | Standard | Typical Size Range |
|---|---|---|
| Plates / Sheets | EN 10028-7, ASTM A240 | 3–80 mm |
| Pipes / Tubes | ASTM A790 / A928 | 1/2" – 24" |
| Flanges / Fittings | EN 1092-1 / ASME B16.5 | DN15 – DN600 |
| Bars / Rods | ASTM A276 | Ø10–200 mm |
Our Products
If you want to know more details and prices of the products, please contact us in time! Email: info@gneestainless.com
