Duplex UNS S31803 Pipes & Tubes in seamless, ERW and welded to ASTM A790. Get quotes from verified suppliers on MetalMitra.
- Duplex UNS S31803 Pipes & Tubes
- Duplex S31803
- Seamless
- ERW
- Welded
- EFW
- LSAW
Your details are never shown publicly. The MetalMitra team reviews every requirement.
Specifications
| Specifications | ASTM A790 / ASME SA790, ASTM A789 / ASME SA A789 |
|---|---|
| Dimensions | ASTM, ASME and API |
| Size | 1/2"NB TO 12 "NB IN |
| Seamless Pipes & Tubes Sizes | 1/2" NB – 8" NB |
| Welded Pipes & Tubes Sizes | 6" NB – 24" NB |
| Outer Diameter | 6.0-630mm |
| Thickness | 0.5-45mm |
| Schedule | SCH20, SCH30, SCH40, STD, SCH80 |
| Type | Seamless / ERW / Welded / Fabricated / CDW |
| Form | Round Pipes/Tubes, Square Pipes/Tubes, Rectangular Pipe/Tubes, Coiled Tubes, "U" Shape, Pan Cake Coils, Hydraulic Tubes |
| Length | Single Random, Double Random & Required Length |
| End | Plain End, Beveled End, Threaded |
Grades & standards
- Duplex 2205
- ASTM A790
- ASTM A789
Chemical composition & mechanical properties
| C | Mn | P | S | Si | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|
| 0.030 | 2.00 | 0.030 | 0.020 | 1.00 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | 0.14–0.20 |
| Tensile strength, min | 655 MPa |
|---|---|
| Yield strength (0.2%), min | 450 MPa |
| Elongation in 50 mm, min | 25% |
| Hardness, max | 293 HBW |
Single values are maximums unless marked min. Values per ASTM A240 (plate, sheet and strip); always confirm against the purchase specification and the mill test certificate.
Duplex UNS S31803 Pipes & Tubes for process, pressure and heat-transfer lines, available on MetalMitra in seamless, ERW and welded to ASTM A790, with mill-certified traceability on every lot.
Choose seamless, ERW, welded or fabricated construction across a broad spread of diameters, wall thicknesses, schedules and lengths for process, pressure and structural lines.
UNS S31803 is the original 2205 duplex stainless steel specification, combining high strength with good chloride corrosion resistance. Duplex stainless steel has a two-phase austenitic-ferritic structure that delivers higher strength than standard austenitic grades together with good resistance to pitting, crevice corrosion and chloride stress corrosion cracking.
Product range
- Seamless Pipes — The go-to choice for high-pressure and high-temperature lines.
- ERW Pipes — Economical welded pipe for utility and process piping.
- Welded / EFW Pipes — Fusion-welded construction for large-diameter runs.
- Tubes — Round, square and rectangular tubes, plus U-bends for heat exchangers.
Why engineers choose it
- High Strength — Roughly double the yield strength of standard 300-series grades.
- Corrosion Resistance — Strong resistance to pitting, crevice and general corrosion.
- SCC Resistance — Far better resistance to chloride stress corrosion cracking.
- Cost Efficient — Thinner walls and long life trim material and lifecycle costs.
Where it is used
- Oil & Gas
- Chemical Processing
- Petrochemical
- Desalination
- Marine Applications
- Pulp & Paper
- Heat Exchangers
- Pressure Vessels
- Water Treatment
- Offshore Platforms
- Fabrication
- General Engineering
Inspection & paperwork
Suppliers on MetalMitra back Duplex UNS S31803 Pipes & Tubes with the checks and paperwork your QA team expects.
- Dimensional & visual inspection
- Grade verification against the order
- Chemical composition verification
- Mechanical property testing
- Flattening / flaring tests as applicable
- Hydrostatic testing as applicable
- Ultrasonic / eddy current testing as applicable
- EN 10204 3.1 Mill Test Certificate
- Third-party inspection (TPI) on request
The MetalMitra advantage
- Verified suppliers — Mills, manufacturers and stockists are reviewed by the MetalMitra team before they list.
- One RFQ, several quotes — Share size, grade and quantity once and compare offers side by side.
- Full traceability — Heat numbers, EN 10204 3.1 MTCs and third-party inspection on request.
- Delivered worldwide — Export-worthy packing and shipping to India, the Middle East, Africa, Europe and the Americas.
Get a quote
Tell us the specification, quantity and destination you need for Duplex UNS S31803 Pipes & Tubes. MetalMitra connects you with suppliers who can deliver.
Technical note: Values on this page are for reference. Always confirm against the governing standard, your purchase specification and the mill test certificate.
Applications & industries
- Oil & Gas
- Chemical Processing
- Petrochemical
- Desalination
- Marine Applications
- Pulp & Paper
- Heat Exchangers
- Pressure Vessels
- Water Treatment
- Offshore Platforms
- Fabrication
- General Engineering
- Oil & Gas
- Petrochemical & Refining
- Chemical Processing
- Water & Wastewater
- Desalination
- Marine & Shipbuilding
- Pulp & Paper
Testing & documents
Ask for the documents you need in your requirement — suppliers confirm them in their quotation:
- Mill test certificate to EN 10204 3.1, or 3.2 with third-party witness
- Third-party inspection (TPI) by SGS, Bureau Veritas, TÜV or your nominated agency
- Tests as the standard or your order requires: hydro, PMI, IGC, NDT, hardness or impact tests
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