ASTM A815 WPS UNS S32750 Elbow LR / SR – Super Duplex 2507 Pipe Fittings
ASTM A815 WPS UNS S32750 elbows are super duplex 2507 pipe fittings designed for high-pressure and highly corrosive environments. Manufactured to ASTM A815 and ASME B16.9 standards, these elbows provide excellent strength, superior resistance to chloride corrosion, and long-term reliability in offshore, chemical, and marine applications.
What is ASTM A815 UNS S32750 Elbow?
ASTM A815 UNS S32750 (SAF 2507 / EN 1.4410) is a super duplex stainless steel pipe fitting combining high mechanical strength with outstanding corrosion resistance.
These elbows are available in:
- Long Radius (LR) Elbow
- Short Radius (SR) Elbow
👉 Designed for butt weld (BW) piping systems
Product Range – Super Duplex 2507 Pipe Fittings
We supply a full range of ASTM A815 WPS S32750 fittings:
- 90° Long Radius Elbow
- 90° Short Radius Elbow
- 45° Elbow
- 180° Return Bend Elbow
All products comply with ASME B16.9 dimensional tolerances.
Key Features of UNS S32750 (SAF 2507)
- ~25% Chromium
- ~7% Nickel
- ~4% Molybdenum
- Nitrogen alloying
This results in a PREN > 40, ensuring excellent resistance to:
- Pitting corrosion
- Crevice corrosion
- Chloride stress corrosion cracking (SCC)
Corrosion Resistance Formula
👉 Higher PREN = better corrosion resistance in aggressive environments
Chemical Composition – UNS S32750 (%)
| Element | Composition |
|---|---|
| Cr | 24.0 – 26.0 |
| Ni | 6.0 – 8.0 |
| Mo | 3.0 – 5.0 |
| N | 0.24 – 0.32 |
| C | ≤ 0.03 |
| Mn | ≤ 1.20 |
| Si | ≤ 0.80 |
| Cu | ≤ 0.50 |
| P | ≤ 0.035 |
| S | ≤ 0.020 |
| Fe | Balance |
Mechanical Properties
| Property | Minimum |
|---|---|
| Tensile Strength | 800 MPa |
| Yield Strength | 550 MPa |
| Elongation | 15% |
👉 Nearly 2× stronger than standard austenitic stainless steel
Equivalent Standards & Grades
- UNS: S32750
- EN / Werkstoff: 1.4410
- Trade Name: SAF 2507
- ASTM: A182 F53 / A240 / A790 / A815
Sizes & Manufacturing Range
- Seamless fittings: 1/2″ – 24″
- Welded fittings: 1/2″ – 72″
- Type: Butt Weld (BW)
- Marking: Standard or customized
- Packing: Fumigation-free wooden cases
Applications of Super Duplex 2507 Elbows
Widely used in:
- Offshore oil & gas platforms
- Subsea systems
- Seawater desalination plants
- Petrochemical facilities
- Chemical processing plants
- High-pressure pipelines
👉 Ideal for marine & high-salinity environments
Processing & Quality Control
Super duplex steel requires strict control to avoid intermetallic phase formation.
We ensure:
- Controlled forming and welding
- Accurate heat treatment
- Balanced microstructure
👉 Ensures optimal toughness and corrosion resistance
Testing & Inspection
All ASTM A815 S32750 elbows undergo:
- Chemical composition analysis
- Mechanical testing
- PMI (Positive Material Identification)
- Dimensional inspection
- Visual inspection
- Harndess
Certification: EN 10204 3.1
Third-party inspection: SGS / BV / TUV available
Quick Summary
- Material: Super Duplex 2507 (UNS S32750)
- Standard: ASTM A815 + ASME B16.9
- Type: LR / SR Elbow
- Strength: 800 MPa tensile
- PREN: > 40
- Application: Offshore, chemical, marine
FAQ: ASTM A815 UNS S32750 Elbows
Q1: What is UNS S32750 elbow used for?
Used in high-pressure and corrosive environments such as offshore oil & gas and desalination plants.
Q2: What is the difference between LR and SR elbow?
LR elbows have a larger bending radius (1.5D), while SR elbows have a smaller radius (1D), suitable for compact piping systems.
Q3: Why choose Super Duplex 2507?
Because it offers high strength and excellent resistance to chloride corrosion and SCC.
Q4: Is third-party inspection available?
Yes, SGS, BV, and TUV inspections are available upon request.
How to Order ASTM A815 UNS S32750 Elbows
Ordering example:
ASME B16.9 ASTM A815 UNS S32750 SMLS 90° LR Elbow 2″ SCH 80S
Please specify:
- Fitting type (Elbow, angle, radius)
- Size and wall thickness
- Seamless or welded
- Standard (ASTM / ASME)
- Inspection requirements
