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Stainless steel grades
Request a quote for SS 304L pipe or tube. Include your product standard, dimensions and material certificate requirements.
Request a quoteTechnical reference
| Field | Order reference |
|---|---|
| Standard | A312 TP304L pipe or A269 TP304L tubing where specified |
| Product or route | Low-carbon austenitic stainless, UNS S30403 |
| Critical dimensions and fit | Write TP304L on the drawing and preserve identification on cut lengths |
| 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 10S process pipe or 19.05 × 1.65 mm 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 |
|---|---|---|---|---|---|
| TP304L | S30403 | ≤0.035 | 18–20 | — | Low carbon |
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) |
|---|---|---|
| TP304L | 485 | 170 |
Reference ASTM A312/A312M scope · CTS A312 technical reference · Tioga A312 pipe grade reference
Ask for heat analysis and grade certification for the specific form.
| 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 |
304/304L dual marking needs compliance with the specified product standard.
For the enquiry, write TP304L on the drawing and preserve identification on cut lengths.
A312 TP304L pipe or A269 TP304L tubing where specified · NPS 2 Sch 10S process pipe or 19.05 × 1.65 mm tube. Add quantity, lengths, delivery city and the required reports.
Ordering guidance
304L is the low-carbon variant of 304. When the L grade is called out for a welded assembly, the purchase order and certificate should identify it explicitly. Ask the supplier to state whether the material is offered as 304L or is documented as dual grade.
For pipe, give the standard, NPS and schedule or the specified wall. For tubing, give OD, wall and length. If an existing weld procedure or material approval restricts substitutions, include that requirement with the enquiry.
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Buyer’s guide
304L (UNS S30403) is the low-carbon grade in the 304 family. In welded service, its lower carbon content reduces the tendency toward sensitisation. Procurement still needs to follow the selected product specification, weld procedure and service requirements. For a repeat spool order, start with the grade on the approved drawing and the corresponding certificate.
An offer marked 304/304L can be reviewed when the certificate identifies both grades and the offered product complies with the ordered specification. Request the certificate or a representative document as part of the technical offer. If the order requires 304L exclusively, communicate that restriction before comparing prices or approving an alternate mill.
When multiple heats will be cut into short sections, agree how heat identification will transfer from parent lengths to pieces. Include the number of lengths, end preparation and any required dimensional report. Pipe callouts use NPS and schedule. Tube callouts use the actual OD and wall, and should name the tube specification separately.
For a welded piping package, send the spool list with TP304L, A312 or the specified ASME designation, size, schedule and cut length. State whether documented dual grade is acceptable and include any weld procedure restrictions from the job.
Ask the mill or supplier for documentation identifying compliance with the ordered grade and specification. A single reported chemistry value is insufficient to confirm the complete order.
Technical references Outokumpu grade reference · ASTM steel standards directory
Prepare your enquiry
| Item | What to send |
|---|---|
| Product details | 304L · specification and edition · NPS or OD · wall · material certificate |
| Delivery | Quantity with units, delivery city and required date if known |
| Acceptance | Required certificates and inspection scope; attach the drawing revision where applicable |
UNS S30403 — The low-carbon grade in the 304 family.
Do not assume so. Ask for an offer and supporting documentation that identify the specified L grade.
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