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Stainless steel grades
Send your SS 321H pipe or tubing specification, wall thickness, length and required test documentation for a quote.
Request a quoteTechnical reference
| Field | Order reference |
|---|---|
| Standard | A312 TP321H pipe or A213 TP321H where specified |
| Product or route | High-temperature titanium-stabilised austenitic stainless, UNS S32109 |
| Critical dimensions and fit | State minimum or nominal wall, support bore clearance and finished length |
| 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: 31.75 × 3.2 mm tube blank with finished bend drawing.
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 |
|---|---|---|---|---|---|
| TP321H | S32109 | 0.04–0.10 | 17–19 | — | Titanium 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) |
|---|---|---|
| TP321H | 515 | 205 |
Reference ASTM A312/A312M scope · CTS A312 technical reference · Tioga A312 pipe grade reference
Review the heat treatment and any grain-size evidence called out by the job.
| 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 |
Use the 321 page when the drawing specifies the non-H grade.
For the enquiry, state minimum or nominal wall, support bore clearance and finished length.
A312 TP321H pipe or A213 TP321H where specified · 31.75 × 3.2 mm tube blank with finished bend drawing. Add quantity, lengths, delivery city and the required reports.
Ordering guidance
A 321H order should retain the H suffix in the enquiry, quotation and material documentation. Provide the standard, edition and any condition or inspection requirements along with dimensions.
Use the project specification to decide which manufacturing routes and dimensions are acceptable. Where the original item is being replaced, include its marked grade, drawing number and purchase history if available.
Check pricing and availability →
Buyer’s guide
321H (UNS S32109) is the high-temperature variant in the titanium-stabilised 321 family. Its order requirements depend on the product standard and edition. If the RFQ is based on an old drawing, reproduce the grade, specified delivery condition and any material tests instead of shortening the callout to 321.
For heating equipment, provide the actual OD, wall basis and finished length. If the tube passes through existing supports, add the critical OD tolerance and straightness requirement. If ordering bends, share the tube drawing with the leg lengths and radius so the offer can clearly distinguish straight stock from formed pieces.
Ask the quote to list the offered material standard, delivery condition and available records. Where inspection or a witness point is specified, include it before the order is placed. If lead time requires an alternative mill or grade, send the deviation to the project reviewer alongside the original requirements.
For a supported hot-section replacement, send the equipment tag, 321H material callout, support bore dimensions and finished tube length. Mark which values are mandatory and attach the current drawing revision.
Require evidence that the supplied material meets the ordered H grade and the associated specification.
Technical references Alleima high-temperature tube grades · Outokumpu grade reference
Prepare your enquiry
| Item | What to send |
|---|---|
| Product details | 321H · specification and edition · NPS or OD · wall · inspection |
| Delivery | Quantity with units, delivery city and required date if known |
| Acceptance | Required certificates and inspection scope; attach the drawing revision where applicable |
UNS S32109 — 321H has a separate UNS designation from 321.
A matching diameter and wall do not verify the grade, standard, condition or test requirements.
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