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Duplex and super duplex
Request a duplex 2205 quote with the required UNS designation, product standard, dimensions and certificate details.
Request a quoteTechnical reference
| Field | Order reference |
|---|---|
| Standard | A790 pipe or A789 tubing, as specified |
| Product or route | Duplex stainless, UNS S32205 or S31803 as ordered |
| Critical dimensions and fit | Order the exact UNS and separate NPS pipe from actual-OD tubing |
| Supply enquiry | Confirm sizes, lengths, route, documentation and lead time for your order |
Selected ASME B36.19 dimensions. Schedule columns give nominal wall thickness. Theoretical inside diameter and mass use nominal dimensions, with a reference density of 8,000 kg/m³. Actual mass varies by grade and tolerances.
| NPS | OD (mm) | 10S wall (mm) | 40S wall (mm) | 80S wall (mm) | 40S ID (mm) | 40S kg/m |
|---|---|---|---|---|---|---|
| 1 | 33.40 | 2.77 | 3.38 | 4.55 | 26.64 | 2.55 |
| 2 | 60.33 | 2.77 | 3.91 | 5.54 | 52.51 | 5.54 |
| 3 | 88.90 | 3.05 | 5.49 | 7.62 | 77.92 | 11.51 |
| 4 | 114.30 | 3.05 | 6.02 | 8.56 | 102.26 | 16.38 |
| 6 | 168.28 | 3.40 | 7.11 | 10.97 | 154.06 | 28.80 |
Reference ASME B36.19 dimensional standard · Tonkin stainless pipe dimensional chart
For tubing, order by actual outside diameter and wall. Drawing example: NPS 2 Sch 40S pipe or 19.05 × 1.65 mm tubing.
Use the approved design code and service conditions. The applicable rating depends on material, temperature, minimum effective wall, joint details and the limits of the connected assembly. A schedule or a hydrostatic test result alone cannot establish an operating pressure.
Reference ASME process piping code B31.3
Selected A789 tubing chemistry ranges by mass. Verify the full chemistry under the nominated product specification.
| UNS | C max (%) | Cr (%) | Ni (%) | Mo (%) | N (%) |
|---|---|---|---|---|---|
| S31803 | 0.03 | 21–23 | 4.5–6.5 | 2.5–3.5 | 0.08–0.20 |
| S32205 | 0.03 | 22–23 | 4.5–6.5 | 3–3.5 | 0.14–0.20 |
Reference Centravis tubular product catalogue · Alleima 2205 tube and pipe data
Mill example from the Alleima heat-exchanger tube range. Use the ordered A789 or A790 edition and applicable product condition for acceptance.
| Grade | Proof stress (MPa) | Tensile strength (MPa) | Elongation min (%) |
|---|---|---|---|
| SAF 2205 | 485 | 680–880 | 25 |
Reference Alleima heat-exchanger tube properties
Check heat treatment and specify phase or corrosion testing only as required by the project.
| When | What to check |
|---|---|
| Before ordering | Document the required test method, edition and any witness points |
| At delivery | Match the material report and heat or lot identification to the shipment |
2507 is a separate super duplex material selection.
For the enquiry, order the exact UNS and separate NPS pipe from actual-OD tubing.
A790 pipe or A789 tubing, as specified · NPS 2 Sch 40S pipe or 19.05 × 1.65 mm tubing. Add quantity, lengths, delivery city and the required reports.
Ordering guidance
Use the exact UNS designation from the drawing when enquiring for duplex 2205. Do not treat S31803 and S32205 as automatically interchangeable certifications. Ask the supplier to identify the designation and supporting material documents in the quote.
Separate pipe from tubing. Where the drawing specifies ASTM A790 for pipe or A789 for tubing, state that standard and edition together with the dimensions and inspection requirements.
Check pricing and availability →
Buyer’s guide
2205 refers to a duplex stainless steel family. Purchasers may encounter UNS S32205 and S31803. Write the exact UNS designation from the approved material list and check any proposed dual certification against the purchase standard. The abbreviated trade designation is insufficient when the project requires one specific grade.
A790 covers seamless and welded ferritic/austenitic stainless pipe. A789 addresses ferritic/austenitic stainless tubing for general service. Use pipe NPS and schedule or specified wall for an A790 pipe line. For an A789 tube line, send actual OD, wall and length, plus any fit or tolerance requirements.
Ask the offer to identify the manufacturing route, delivery condition and material traceability. If the inspection plan calls for phase balance, detrimental intermetallic phase testing or corrosion testing, specify method, sampling and acceptance as stated by the project. Quote those requirements along with the dimensions.
On a duplex skid, put the S32205 A790 manifold pipe and any A789 instrument or process tube on separate rows. Identify each size system and state whether the job permits alternate UNS designations.
Ask for evidence of compliance with the ordered UNS and product standard. Route a proposed material change through the project’s approval process.
Technical references ASTM A790/A790M duplex pipe scope · ASTM steel standards directory · Alleima 2205 tube and pipe data
Prepare your enquiry
| Item | What to send |
|---|---|
| Product details | UNS designation · pipe or tube specification · dimensions · wall · test requirements |
| Delivery | Quantity with units, delivery city and required date if known |
| Acceptance | Required certificates and inspection scope; attach the drawing revision where applicable |
Request the full UNS designation and product standard on the quotation and certificate.
Technical reference: ASTM steel standards catalogue
Project enquiries
Send your dimensions, quantities and delivery city. Include any inspection or material certificate requirements so they can be quoted against the same line items.
Request a quote → Call +91 99204 92715