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Forms and finishes
Enquire for welded stainless pipe or tubing. Specify the required welding route, standard, grade, dimensions and inspection.
Request a quoteTechnical reference
| Field | Order reference |
|---|---|
| Standard | A312 welded pipe, A249 heat-transfer tube or A554 mechanical tubing |
| Product or route | Welded round pipe, round tube or mechanical profile |
| Critical dimensions and fit | Specify the allowed weld route and any seam finish or bead clearance |
| 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 welded pipe versus 19.05 × 1.24 mm welded exchanger 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
The grade on the purchase line controls chemistry. Specify the grade with the finished product standard or drawing.
| Check | What to match |
|---|---|
| Grade and specification | TP or UNS on the quotation and material report |
| Heat analysis | Full limits and any stabilising or alloy additions under the ordered edition |
Reference ASTM steel standards
Use the ordered grade, delivery condition and product standard to review the actual tensile, yield, elongation or hardness results required by the order.
| Check | What to verify |
|---|---|
| Condition | Heat treatment or cold-work condition stated for the offered form |
| Acceptance | Project-specified dimensions and relevant test records |
Reference ASTM steel standards
Record which weld examinations or reports the drawing requires.
| 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 |
Match the weld route to the product standard and application.
For the enquiry, specify the allowed weld route and any seam finish or bead clearance.
A312 welded pipe, A249 heat-transfer tube or A554 mechanical tubing · NPS 2 Sch 40S welded pipe versus 19.05 × 1.24 mm welded exchanger tubing. Add quantity, lengths, delivery city and the required reports.
Ordering guidance
“Welded” identifies a broad product form. If a job calls for ERW, EFW or another specific manufacturing route, put that requirement on the RFQ. Include the nominated product standard and do not treat those routes as interchangeable.
For pipe, state NPS and schedule or specified wall. For tubing, state actual OD and wall, or outside sides for shaped products. Include any required seam finish, inspection or test report before pricing.
Check pricing and availability →
Buyer’s guide
Welded A312 pipe, A249 welded heat-transfer tube and A554 welded mechanical tube serve different purchase requirements. A drawing that says only “ERW” leaves the grade, product standard and inspection scope open. Confirm the allowed process with the buyer or engineer before accepting a manufacturing route as equivalent.
The needs of a polished railing, an exchanger tube and a process line differ. If the inner seam must clear an insert or meet a bore finish requirement, give an acceptance condition for it. For visible parts, identify the show surface and the finish near the seam. For a process line, send the inspection plan and any seam examination requirements with the enquiry.
Ask each supplier to state the offered standard, grade, weld route and delivery condition. If the project calls for a specified test, provide the method and acceptance requirements from the purchase specification. A quote that simply says “tested” may omit the evidence needed at receiving.
For a replacement tube bundle, give A249 or the nominated code designation, grade, actual OD, wall basis and length. Specify any weld seam finish or inspection requirements that must be included in the price.
When the drawing permits both routes or the project wants to review an alternate. Ask for the different route and documentation on its own line.
Technical references ASTM steel standards directory · ASTM A554 mechanical tubing scope
Prepare your enquiry
| Item | What to send |
|---|---|
| Product details | Welded route · standard · grade · size and wall · seam finish · inspection |
| Delivery | Quantity with units, delivery city and required date if known |
| Acceptance | Required certificates and inspection scope; attach the drawing revision where applicable |
First verify that the project permits both and that each offer matches the same grade, dimensions, tests and delivery basis.
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