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Stainless steel grades
Enquire for 904L stainless steel pipe or tubing. Send the exact standard, UNS designation, dimensions and certificate requirements.
Request a quoteTechnical reference
| Field | Order reference |
|---|---|
| Standard | A312 N08904 pipe where specified. Confirm the requested tube specification separately |
| Product or route | High-alloy molybdenum- and copper-bearing austenitic stainless, UNS N08904 |
| Critical dimensions and fit | Identify the approved source if required, manufacturing route and end preparation |
| 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 with grade N08904 stated explicitly.
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 |
|---|---|---|---|---|---|
| 904L | N08904 | ≤0.02 | 19–23 | 4–5 | Copper-bearing high-alloy 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) |
|---|---|---|
| 904L | 490 | 215 |
Reference ASTM A312/A312M scope · CTS A312 technical reference · Tioga A312 pipe grade reference
Ask for traceability by heat and any required material identification report.
| 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 |
Compare proposed alternatives against the documented chemical duty.
For the enquiry, identify the approved source if required, manufacturing route and end preparation.
A312 N08904 pipe where specified. Confirm the requested tube specification separately · NPS 2 Sch 40S pipe with grade N08904 stated explicitly. Add quantity, lengths, delivery city and the required reports.
Ordering guidance
For 904L, state the grade or specified UNS designation and confirm the nominated pipe or tube standard. Share the drawing, dimensions and manufacturing route so the quote reflects the product form you actually need.
If the material is being selected for a corrosive environment, leave suitability to the project’s material assessment. The commercial enquiry should specify the approved material and any tests or documentation required to verify it.
Check pricing and availability →
Buyer’s guide
904L (UNS N08904) is a high-alloy austenitic stainless steel containing molybdenum and copper. It may be specified for demanding chemical duties after material review. Provide the drawing’s material callout, standard and approved grade. When a supplier offers an alternative, ask for the written designation and keep that option separate for engineering approval.
For pipe, provide NPS and schedule or specified wall, line lengths and end details. For exchanger or process tubing, give actual OD, wall, length and delivery condition. If the quantity includes both standard lengths and cut pieces, list them separately so material yield and traceability can be accounted for.
Ask the quote to state the offered manufacturing route and certificate scope. If the project requires positive material identification, an approved source or an inspection release, include it at enquiry. For a replacement caused by corrosion, share the original material records and make sure the new selection has been approved for the stated service.
For a chemical plant spool, send a separate N08904 pipe line with the governing specification, schedule, lengths and bevel details. Identify any companion tubing by its own standard and OD × wall.
Material approval must account for the acid, concentration, temperature and contaminants, alongside the equipment design.
Technical references Outokumpu high-alloy grade reference · Outokumpu grade reference
Prepare your enquiry
| Item | What to send |
|---|---|
| Product details | 904L · specified UNS designation · product standard · route · wall · 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 N08904 — A high-alloy austenitic grade. Confirm that the product form and standard match the order.
No. Process conditions and design requirements must be assessed separately. Use the grade and standard already approved for the project.
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