ASTM A815 S32750 Super Duplex Stainless Steel Equal Tee with Chloride Service Capability Butt Weld Fitting
2507 Super Duplex Equal Tees for High-Corrosion Piping Systems
ASTM A815 UNS S32750 Equal Tee is a 2507 super duplex stainless steel butt-welding fitting designed to create a 90-degree branch connection in process piping systems.
UNS S32750 combines a ferritic-austenitic duplex microstructure with relatively high chromium, molybdenum and nitrogen contents. The grade is commonly selected for piping exposed to chloride-containing fluids, seawater, brine and demanding chemical environments.
The equal tee maintains the same nominal branch size as the run, allowing a straight pipeline to be divided into two branches of identical nominal diameter. Butt-weld ends provide a direct welded connection with the adjoining pipe.
ASTM A815 covers wrought ferritic/austenitic stainless steel fittings, while dimensional requirements for butt-welding fittings are normally specified together with applicable dimensional standards and project requirements.
| Item | Specification |
|---|---|
| Product Name | S32750 Super Duplex Equal Tee |
| Material Grade | UNS S32750 / 2507 |
| Material Type | Super Duplex Stainless Steel |
| Material Standard | ASTM A815 |
| ASME Equivalent | SA815 |
| Fitting Type | Equal Tee |
| Connection | Butt Weld |
| Dimensional Standard | ASME B16.9 / MSS SP-43 |
| Manufacturing | Hot Formed / Cold Formed |
| Heat Treatment | Solution Annealed |
| Size Range | According to Standard / Drawing |
| Wall Thickness | Sch 5S-XXS / Custom |
| Inspection | PMI, UT, PT, Dimensional Inspection |
| Certification | EN 10204 3.1 / 3.2 |
- Super Duplex 2507 Metallurgy: UNS S32750 belongs to the super duplex stainless steel family, combining ferritic and austenitic phases to provide a balance of strength and corrosion resistance.
- Chloride Service Capability: The high-alloy chemistry makes 2507 suitable for environments where pitting corrosion, crevice corrosion and chloride-induced stress corrosion cracking are design considerations.
- Equal Branch Geometry: The run and branch have the same nominal diameter, making the fitting suitable for equal-size branch connections.
- Butt-Weld Configuration: The butt-weld ends allow the tee to be directly welded to the piping system and provide a continuous flow path after fabrication.
- Solution-Annealed Condition: Proper solution annealing is important for maintaining the intended duplex microstructure and corrosion performance.
- Seawater Piping Systems
- Desalination Plants
- Offshore Process Piping
- Chemical Process Piping
- Produced Water Systems
- Brine Handling Systems
- Flue Gas Desulfurization (FGD) Systems
- Marine Piping
- Oil & Gas Process Facilities
- High-Chloride Process Lines
| Standard | Grade / Designation |
|---|---|
| ASTM | A815 S32750 |
| ASME | SA815 S32750 |
| UNS | S32750 |
| Commercial Grade | 2507 |
| EN | 1.4410 |
| EN Designation | X2CrNiMoN25-7-4 |
| Feature | 2205 Duplex | 2507 Super Duplex |
|---|---|---|
| UNS | S31803 / S32205 | S32750 |
| Material Family | Duplex | Super Duplex |
| Cr Level | Lower | Higher |
| Mo Level | Lower | Higher |
| Nitrogen | Lower | Higher |
| Chloride Resistance | High | Higher |
| Typical Service | General Duplex Applications | More Severe Chloride Service |
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