Duplex 2205 CouplingASTM A182 · ASME B16.11 · Manufacturer, trader & exporter, India
UNS S32205 / S31803 · W.Nr 1.4462
A Duplex 2205 coupling is a short forged fitting that joins two pipes, made from Duplex 2205 to ASTM A182 F51 / F60. Full couplings join two pipes; half couplings are welded to a pipe or vessel as a branch connection. Socket-weld or threaded to ASME B16.11.
- ASTM A182
- ASME B16.11
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is a Duplex 2205 Coupling?
- What it is
- A short forged fitting that joins two pipes
- Material
- ASTM A182 F51 / F60
- Dimensions
- ASME B16.11
- Grade
- Duplex 2205 · UNS S32205
- Best at
- Strength with chloride resistance at a stainless-steel budget
Duplex 2205 Coupling Specification
| Product | Duplex 2205 Coupling |
|---|---|
| Material standard | ASTM A182 F51 / F60 |
| Dimensional standard | ASME B16.11 |
| Sizes | ⅛" – 4" (ASME B16.11) |
| Wall / class | Class 2000 / 3000 / 6000 / 9000 |
| Ends | Socket weld · NPT threaded |
| Testing | PMI (as specified in the PO) · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 or 3.2 on request / as specified in the PO |
When to Choose a Coupling
Full couplings join two pipes; half couplings are welded to a pipe or vessel as a branch connection. Socket-weld or threaded to ASME B16.11.
- Full and half couplings
- Reducing couplings
- Class 3000 / 6000 / 9000
More on choosing: Coupling guide.
Duplex 2205 Coupling: Why 2205 for couplings
Full couplings join two pipes; half couplings are welded to a pipe or vessel as a branch connection. Socket-weld or threaded to ASME B16.11. In Duplex 2205, the choice usually comes down to the medium and temperature — the rows here are the points buyers check for this exact combination.
| Why this grade | Duplex fittings match duplex pipe in chloride service and strength. Duplex 2205 is picked for strength with chloride resistance at a stainless-steel budget. |
|---|---|
| Typical service | Oil & gas — Flowlines, manifolds and topside piping. |
| Welding to carbon steel | ER2209 or ER309L(Mo) is used when joining it to carbon steel, under a qualified WPS |
| Matching filler | ER2209 (AWS A5.9) |
| Sour service | Listed in NACE MR0175 / ISO 15156-3 within its limits — state it on the order |
Duplex 2205 Coupling Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Nickel | As specified |
| Molybdenum | As specified |
| Nitrogen | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Phosphorus | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM A240 for UNS S32205.
Duplex 2205 Coupling Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
| Hardness | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM A240 for UNS S32205 — Solution-annealed plate & sheet.
Full chemistry, properties and equivalents are on the Duplex 2205 grade page.
Other Duplex 2205 pipe fittings
Duplex 2205 Coupling — questions buyers ask
What is a half coupling used for?
It is welded onto a pipe or vessel to create a small threaded or socket-weld branch.
Can Duplex 2205 couplings be welded to carbon steel?
Yes — ER2209 or ER309L(Mo) is used when joining it to carbon steel, under a qualified WPS.
Which standard covers Duplex 2205 couplings?
The material is ASTM A182 F51 / F60; dimensions follow ASME B16.11. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a Duplex 2205 coupling?
The alloy price, the size and schedule or class, quantity, and the testing and documents required. Send your list and we quote the same working day.
Can you supply Duplex 2205 couplings to NACE MR0175?
Yes. Duplex 2205 is listed in NACE MR0175 / ISO 15156-3 within its limits; state NACE compliance on the order and it is confirmed on the certificate.
What documents do you supply?
EN 10204 3.1 or 3.2 certificates available on request / as specified in the PO; dimensional reports as required. PMI can be arranged depending on product and requirements, as specified in the PO.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026