ASTM A815 WPS UNS S32750 Elbow LR / SR – ASME B16.9 Super Duplex 2507 Pipe Fittings
ASTM A815 WPS UNS S32750 Elbows are high-performance Super Duplex 2507 pipe fittings manufactured for use in corrosive and high-pressure piping systems. Produced in accordance with ASTM A815 material specification and ASME B16.9 dimensional standard, these fittings are available in Long Radius (LR) and Short Radius (SR) configurations.
UNS S32750, also known as SAF 2507 or EN 1.4410, is a super duplex stainless steel designed to provide exceptional strength and superior resistance to pitting, crevice corrosion, and chloride stress corrosion cracking (SCC).
Product Range – Super Duplex 2507 Pipe Fittings
We manufacture a complete range of ASTM A815 WPS UNS S32750 butt weld pipe fittings, including:
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90° Long Radius Elbow
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90° Short Radius Elbow
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45° Elbow
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180° Return Elbow
- All fittings comply with ASME B16.9 dimensional tolerances.
About ASTM A815 WPS UNS S32750
ASTM A815 covers wrought ferritic/austenitic stainless steel fittings for pressure piping applications. The designation “WPS” indicates wrought pipe fittings of duplex and super duplex stainless steel.
UNS S32750 (SAF 2507) features:
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~25% Chromium
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~7% Nickel
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~4% Molybdenum
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Nitrogen addition
This composition results in a PREN value above 40:
PREN = %Cr + 3.3(%Mo) + 16(%N)
High PREN ensures superior resistance to localized corrosion in chloride environments.
Chemical Composition – UNS S32750 (%)
| Element | Composition |
|---|---|
| Cr | 24.0 – 26.0 |
| Ni | 6.0 – 8.0 |
| Mo | 3.0 – 5.0 |
| C | ≤ 0.03 |
| N | 0.24 – 0.32 |
| 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 (116 KSI) |
| Yield Strength | 550 MPa (80 KSI) |
| Elongation | 15% |
Super Duplex 2507 provides nearly twice the yield strength of standard austenitic stainless steels.
Equivalent Standards & Grades
| Standard | Equivalent |
|---|---|
| UNS | S32750 |
| EN / Werkstoff | 1.4410 |
| Trade Name | SAF 2507 |
| ASTM Equivalent | A182 F53, A240, A790, A815 |
Related Grade:
UNS S32760 (1.4501 / F55) – higher alloyed super duplex with enhanced corrosion resistance.
Sizes & Manufacturing Range
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Seamless fittings: 1/2″ NB – 24″ NB
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Welded fittings: 1/2″ NB – 72″ NB
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Type: Butt Weld (BW)
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Marking: As per standard or customer requirement
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Packing: Fumigation-free wooden case
Applications
ASTM A815 UNS S32750 pipe fittings are widely used in:
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Offshore oil & gas platforms
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Subsea production systems
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Seawater desalination plants
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Chemical processing plants
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Petrochemical facilities
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High-pressure pipelines
Due to its superior chloride resistance and high mechanical strength, Super Duplex 2507 is ideal for aggressive marine and high-salinity environments.
Processing Considerations
Super duplex stainless steels offer excellent corrosion resistance and strength but require controlled processing to prevent the formation of intermetallic phases. Improper heat treatment or welding may reduce impact toughness and corrosion performance.
We ensure strict quality control during forming, welding, and heat treatment to maintain optimal microstructure balance.
Testing & Inspection
All ASTM A815 WPS UNS S32750 fittings undergo comprehensive testing:
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Chemical composition analysis
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Mechanical testing
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PMI (Positive Material Identification)
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Hydrostatic testing (if required)
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Dimensional inspection
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Visual examination
Material Test Certificate EN 10204 3.1 available prior to shipment.
Third-party inspection (SGS, BV, TUV) 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:
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Fitting type (Elbow,Radius,Angle)
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Size and wall thickness
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Seamless or welded
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Standard (ASTM A815 / ASME B16.9)
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Inspection requirements
ASTM A815 WPS UNS S32750 elbows, also known as Super Duplex 2507 pipe fittings, are high-performance austenitic–ferritic stainless steel fittings designed for extreme corrosion resistance and high mechanical strength. Manufactured in accordance with ASTM A815 material specification and ASME B16.9 dimensional standard, these elbows are available in long radius (LR) and short radius (SR) configurations to suit various piping layouts.
Super Duplex 2507 elbows are widely used in offshore oil & gas, subsea systems, seawater desalination plants, chemical processing, and high-pressure piping systems where standard stainless steels cannot meet performance requirements.
