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Stainless steel grades
Request a quote for SS 347 pipe or tube. Include the specified grade, manufacturing route, dimensions and delivery city.
Request a quoteTechnical reference
| Field | Order reference |
|---|---|
| Standard | A312 TP347 pipe or the nominated tubular standard |
| Product or route | Niobium-stabilised austenitic stainless, UNS S34700 |
| Critical dimensions and fit | Keep the standard and exact grade on the spool or bundle line |
| 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 3 Sch 40S pipe with bevel detail on the isometric.
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 chemistry by mass for the A312 pipe designations below. The ordered edition, full element limits and any applicable notes govern acceptance. A dash means the value is omitted here.
| Grade | UNS | C (%) | Cr (%) | Mo (%) | Grade feature |
|---|---|---|---|---|---|
| TP347 | S34700 | ≤0.08 | 17–19 | — | Niobium stabilised |
Reference ASTM A312/A312M scope · Centravis tubular product catalogue · Alleima high-temperature tubular grades
Selected minimum room-temperature tensile and yield strengths for A312 pipe. Elongation acceptance depends on the specimen orientation and applicable thickness basis. For tube orders, apply the nominated tube specification.
| Grade | Tensile minimum (MPa) | Yield minimum (MPa) |
|---|---|---|
| TP347 | 515 | 205 |
Reference ASTM A312/A312M scope · CTS A312 technical reference · Tioga A312 pipe grade reference
Confirm stabilising addition and heat identification against the ordered grade.
| 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 |
347H is a separately identified hot-duty grade.
For the enquiry, keep the standard and exact grade on the spool or bundle line.
A312 TP347 pipe or the nominated tubular standard · NPS 3 Sch 40S pipe with bevel detail on the isometric. Add quantity, lengths, delivery city and the required reports.
Ordering guidance
When 347 appears on the material list, use that grade and the exact product standard on the RFQ. Confirm the requested pipe schedule or tube OD and wall, and include the manufacturing route when it is specified.
If the job has a separate 347H requirement, list it independently. Ask the quotation to show material documentation and test scope against each item, so any substitution is visible before purchase.
Check pricing and availability →
Buyer’s guide
347 (UNS S34700) is a niobium-stabilised austenitic grade. Some documents use the older term columbium for niobium. Where a process specification calls for 347, the product standard and exact grade should be stated together. Similar alloy names on historical equipment records need to be reconciled with the approved material list.
For pipe spool work, record NPS, schedule or specified wall, end detail and lengths. For a tubular heating or exchanger component, give the actual OD, wall basis, finished length and required route. Supply any supplementary checks specified in the inspection plan so the offer can state which documents are included.
347 and 347H carry different designations. If a certificate cites both, check compliance with the ordered grade and standard. If it lists only 347H, log it as a proposed alternative for the project reviewer. Preserve heat or lot identification when lengths will be cut into spool pieces.
When replacing a welded section, attach the approved isometric and grade callout. Add any end bevel detail and required traceability for cut lengths so the supplier can quote the correct scope.
They use different stabilising additions and have different material designations. Buy the grade stated by the project or have a proposed change reviewed.
Technical references Alleima high-temperature tube grades · Outokumpu grade reference
Prepare your enquiry
| Item | What to send |
|---|---|
| Product details | 347 · product standard · size · wall · manufacturing route · test scope |
| Delivery | Quantity with units, delivery city and required date if known |
| Acceptance | Required certificates and inspection scope; attach the drawing revision where applicable |
UNS S34700 — An austenitic grade; 347H is a separate designation to confirm on the material record.
Ask the supplier to clarify compliance against the ordered grade and refer any proposed substitution to the project authority.
Technical reference: Grade designation reference
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