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Stainless steel grades
Enquire for SS 304 pipes and tubes. Specify pipe size and schedule or tube OD and wall thickness, plus quantity and delivery city.
Request a quoteTechnical reference
| Field | Order reference |
|---|---|
| Standard | A312 TP304 pipe or A269 TP304 tubing where specified |
| Product or route | Austenitic chromium-nickel stainless, UNS S30400 |
| Critical dimensions and fit | Record pipe ends and schedule, or tube length and OD tolerance |
| 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 25.4 × 1.65 mm round tube.
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 |
|---|---|---|---|---|---|
| TP304 | S30400 | ≤0.08 | 18–20 | — | Chromium-nickel base grade |
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) |
|---|---|---|
| TP304 | 515 | 205 |
Reference ASTM A312/A312M scope · CTS A312 technical reference · Tioga A312 pipe grade reference
Check TP304 and any dual-grade marking against the applicable specification.
| 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 |
304L for an explicitly low-carbon purchase line.
For the enquiry, record pipe ends and schedule, or tube length and OD tolerance.
A312 TP304 pipe or A269 TP304 tubing where specified · NPS 2 Sch 40S pipe or 25.4 × 1.65 mm round tube. Add quantity, lengths, delivery city and the required reports.
Ordering guidance
Start with the exact grade on the drawing. If the purchase order says TP304, retain that designation when specifying A312 pipe. For tubing, confirm the applicable product standard separately rather than copying the pipe callout into a tube order.
When two quotes describe the same nominal size, verify the wall, length, finish and manufacturing route before comparing price. If a quote offers dual-marked material, check its certificate against the grade and edition your project requires.
Check pricing and availability →
Buyer’s guide
304 is an austenitic chromium-nickel stainless grade, UNS S30400. TP304 on an A312 order describes austenitic stainless pipe. An A269 tube order is a separate specification for general-service tubing. A polished mechanical tube used in a railing or frame is ordered against its own form, finish and dimensional requirements. A single description such as “304 round tube” leaves these requirements undecided.
For a frame or equipment guard, provide the cut list, required straightness and where weld seams or surface marks will be visible. Agree the face finish and the direction of any brushing before cutting. For process pipe, provide the spool dimensions and end preparation instead. Confirm whether the purchase price includes cutting, end preparation and bundling by length.
If the drawing calls out the low-carbon variant, obtain an offer expressly documenting 304L. If the engineering team is evaluating a change for a more corrosive duty, send the media and design notes with the enquiry. Keep 304, 304L and 316 as separate offers so a commercial comparison does not accidentally become a material substitution.
A fabricated guard may be quoted as 304 welded mechanical tube, 38 mm actual OD × 1.5 mm wall, with a brushed outside finish per sample. A nominal pipe line with the same alloy needs an NPS and schedule instead.
The grade should be checked against the product identification and material records. The same appearance can be produced on several alloys.
Technical references Outokumpu grade reference · ASTM steel standards directory
Prepare your enquiry
| Item | What to send |
|---|---|
| Product details | 304 or TP304 · pipe NPS and schedule or tube OD × wall · route · length |
| Delivery | Quantity with units, delivery city and required date if known |
| Acceptance | Required certificates and inspection scope; attach the drawing revision where applicable |
UNS S30400 — Austenitic chromium-nickel stainless steel.
No. It still needs a tube standard, actual dimensions and any required finish or tolerance.
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