Views: 2 Author: Monica Publish Time: 2025-11-19 Origin: Site
Duplex S32205 short radius elbows are pipe fittings used to change the direction of pipelines. These fittings are made of duplex stainless steel, offering excellent corrosion resistance and high strength, and are widely used in chemical, oil and gas, and offshore operations.
In this guide, we will provide a detailed overview of their compliance with ASME B16.9 S32205 Short Radius Elbow Dimensions.
Short radius elbows allow for fluid direction changes with a smaller bending radius. Unlike long radius elbows, where the center distance is 1.5 times the pipe diameter, short radius elbows have a center distance equal to the nominal pipe diameter (NPS). S32205 short radius elbows are primarily used in confined spaces.
"Short radius" specifically refers to a bending radius of 1.0 times the nominal pipe diameter. For example, a 6-inch short radius elbow has a center distance of 6 inches. Compared to long radius elbows, the pressure drop may be higher, and the flow characteristics may be less smooth.
Duplex stainless steel S32205, also known as UNS S32205 or F60, is a ferritic-austenitic duplex stainless steel. This duplex structure has the following advantages:
Enhanced corrosion resistance, particularly resistance to stress corrosion cracking.
Higher mechanical strength than conventional stainless steel.
Excellent resistance to pitting and crevice corrosion.
Good weldability and formability.
These properties make S32205 duplex stainless steel short-radius elbows particularly suitable for corrosive environments common in the chemical, oil and gas production, marine, and petrochemical industries.
ASME B16.9 is factory-made butt welding fittings dimensions, including short radius elbows. This specification covers:
Pressure-temperature ratings.
Size and dimensional tolerances.
Materials requirements.
Testing and marking protocols.
Methods of designating openings.
For Duplex S32205 Short Radius Elbows, the applicable material specification is ASTM A815/ASME SA815. Duplex S32205 Short Radius Elbow fittings are available in both seamless and welded constructions, with seamless variants typically ranging from 1/2" to 10" and welded versions available from 1/2" to 48".
The following table is the standard dimensions for ASME B16.9 Short Radius Elbows, which apply to Duplex S32205 versions:
Standard Dimensions for ASME B16.9 Short Radius Elbows
Nominal Pipe Size (NPS) | Outside Diameter at Bevel (mm) | Center-to-End Dimension A (mm) |
1 | 33.4 | 25 |
1¼ | 42.2 | 32 |
1½ | 48.3 | 38 |
2 | 60.3 | 51 |
2½ | 73.0 | 64 |
3 | 88.9 | 76 |
3½ | 101.6 | 89 |
4 | 114.3 | 102 |
5 | 141.3 | 127 |
6 | 168.3 | 152 |
8 | 219.1 | 203 |
10 | 273.0 | 254 |
12 | 323.8 | 305 |
14 | 355.6 | 356 |
16 | 406.4 | 406 |
18 | 457.0 | 457 |
20 | 508.0 | 508 |
22 | 559.0 | 559 |
24 | 610.0 | 610 |
The ASME B16.9 tolerances for short radius elbows include:
Nominal Pipe Size (NPS) | Outside Diameter at Bevel (mm) | Inside Diameter at End (mm) | Wall Thickness | Center-to-End Dimension (mm) |
1/2 to 2 1/2 | ±1 | ±0.8 | Not less than | ±2 |
3 to 3 1/2 | ±1 | ±1.6 | 87.5% of nominal | ±2 |
4 | +2/-1 | ±1.6 | wall thickness | ±2 |
5 to 6 | +3/-1 | ±1.6 | ±2 | |
8 | ±2 | ±1.6 | ±2 | |
10 | +4/-3 | ±3.2 | ±2 | |
12 to 18 | +4/-3 | ±3.2 | ±3 | |
20 to 24 | +6/-5 | ±4.8 | ±3 |
Wall Thickness: Defined by "schedule" (e.g., Sch 5S, 10S, 40S, 80S). Higher schedules indicate greater thickness and pressure-handling capacity.
Angle Variations: While 90° is most common, short radius elbows are also available in 45° and 180° elbows for different directional needs.
End Preparation: Beveled ends are standard for welding, ensuring proper weld integration.
Chemical Composition of Duplex Steel UNS S32205
Composition | Content (%) |
C | 0.030 max |
Mn | 2.00 max |
Si | 1.00 max |
P | 0.030 max |
S | 0.020 max |
Cr | 21.0 - 23.0 |
Mo | 2.50 - 3.50 |
Ni | 4.50 - 6.50 |
N | 0.08 - 0.20 |
Fe | 63.54 min |
Mechanical Properties of Duplex Steel UNS S32205
Property | Value |
Density | 7.8 g/cm³ |
Melting Point | 1350°C (2460°F) |
Tensile Strength | 800 MPa (116,000 psi) |
Yield Strength (0.2% Offset) | 550 MPa (80,000 psi) |
Elongation | 15% |
Duplex S32205 Short Radius Elbows are manufactured in various wall thickness schedules to meet different pressure requirements:
Standard Wall Thickness Schedules
SCH 5S, 10S, 40S, 80S: Standard schedules for stainless steel pipe fittings.
SCH 10, 20, 30, STD, 40, 60, 80, XS, 100, 120, 140, 160, XXS: Available schedules for different pressure ratings.
The weight of short radius elbows varies significantly based on the size and schedule thickness. For example:
A 2 inch 90° Short Radius Elbow in Schedule 40S weighs approximately 0.66 kg (1.46 lb).
A 6 inch 90° Short Radius Elbow in Schedule 40S weighs approximately 9.94 kg (21.91 lb).
Pre-installation Inspection
Before installation, conduct a thorough visual inspection of the duplex stainless steel S32205 short-radius elbow to verify that its material certification complies with ASTM A815/ASME SA815 standards and to check for defects, including surface imperfections, dimensional irregularities, or shipping damage.
Cutting and End Treatment
Cut the connecting pipe to the required length using cold cutting methods. Machin the pipe ends according to ASME B16.25 to create a 37.5° bevel with a thickness of 1.6 mm, ensuring a surface roughness Ra of 3.2 μm or less for optimal weld integrity.
Installation and Alignment
Align and assemble the pipe assembly according to ASME B31.3, maintaining a uniform root gap of 1.6 mm ± 0.4 mm across the entire circumference to ensure consistent weld penetration.
Use alignment fixtures and clamping devices to achieve and maintain proper assembly, and verify that the maximum permissible deviation does not exceed 1.5 mm or 10% of the wall thickness.
Confirm that the center-to-end dimensions of the elbow conform to the tolerances specified in ASME B16.9, while ensuring that the elbow direction is correctly aligned with the pipe configuration and flow direction.
Welding Procedure
Welding operations shall be performed according to qualified welding procedure specifications, using matching welding wires, such as ER2209 wire for GTAW and E2209 wire for SMAW. Using a calibrated temperature indicator, the interpass temperature shall be strictly controlled between 100-150°C, while the heat input shall be controlled within the range of 0.5-2.5 kJ/mm.
Root protection and back purging shall be performed using 100% argon gas with a dew point of -50°C to ensure that the oxygen content is below 0.1% throughout the welding process.
Post-Weld Treatment and Inspection
After welding, all weld discoloration and heat-induced coloration shall be carefully removed using specialized stainless steel grinding tools. Passivation treatment shall then be performed with a 20-40% nitric acid solution to restore the protective oxide layer.
Non-destructive testing shall be performed on all welds according to ASME requirements. Final dimensional verification shall be performed before pressure testing and system commissioning to confirm that the installed system meets all specified tolerances.
The price of the Duplex S32205 short radius elbow is not a fixed value.
Since there is no price list, accurate costs require direct contact with the supplier.
The final price of duplex S32205 short-radius elbows depends on several factors:
Nominal pipe diameter (NPS) and wall thickness grade (e.g., SCH10S, SCH40S, SCH80S).
Purchase quantity: Larger order quantities result in lower unit prices, as shown in the example.
Technical standards and certifications: Compliance with standards such as ASME B16.9 and material certifications such as ASTM A815/ASME SA815 will affect costs.
Current raw material costs: The price of S32205 duplex steel fluctuates in the market, directly impacting the final product price.
Contact us for the latest price of S32205 short radius elbows!
