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Stainless steel grades
Request a quote for SS 317L pipe or tubing with your project standard, dimensions, end preparation and certificate requirements.
Request a quoteTechnical reference
| Field | Order reference |
|---|---|
| Standard | A312 TP317L pipe or a tube specification that lists the required grade |
| Product or route | Low-carbon molybdenum-bearing austenitic stainless, UNS S31703 |
| Critical dimensions and fit | Identify the approved grade and whether the order is a spool or tube bundle |
| 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 4 Sch 40S process spool example.
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 |
|---|---|---|---|---|---|
| TP317L | S31703 | ≤0.035 | 18–20 | 3–4 | Higher molybdenum range than TP316L |
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) |
|---|---|---|
| TP317L | 515 | 205 |
Reference ASTM A312/A312M scope · CTS A312 technical reference · Tioga A312 pipe grade reference
Keep corrosion-driven alternates separate and verify heat traceability.
| 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 with 316L only against the approved corrosion assessment.
For the enquiry, identify the approved grade and whether the order is a spool or tube bundle.
A312 TP317L pipe or a tube specification that lists the required grade · NPS 4 Sch 40S process spool example. Add quantity, lengths, delivery city and the required reports.
Ordering guidance
A request for 317L should identify the pipe or tube specification rather than relying on the alloy name alone. Share the drawing or line class, dimensions and documentation requirements so the quoted item can be compared directly with the order.
For replacement material, include the previous item marking or heat traceability details where available. If the specification requires 317L, refer any proposed alternative to the project engineer rather than substituting from a grade comparison chart.
Check pricing and availability →
Buyer’s guide
317L (UNS S31703) is a low-carbon molybdenum-alloyed austenitic grade with more molybdenum than typical 316L. It can be considered where the approved material selection calls for improved corrosion resistance. A commercial enquiry should identify the selected grade and service line, especially when a previous material was replaced after corrosion or repeated maintenance.
For a chemical transfer spool, state the pipe specification, size, wall and end details. For a replacement bundle, use the tube material schedule, actual OD, wall basis and length instead. A grade found in an alloy datasheet is only the starting point. Confirm that the ordered tubular specification and grade combination is supported in the supplier’s offer.
Ask for the proposed grade, manufacturing route, certificate scope and date of dispatch. If stock is offered under an alternate standard, request it as a separate option so the buyer can see the deviation. Include your delivery city and identify any priority lines required first during the shutdown.
For a corroded spool replacement, send the drawing and past certificate with the 317L line marked. Include NPS, schedule or specified wall, lengths and end preparation, then identify whether the project requires a documented material verification step.
They have different UNS designations and material requirements. Check the exact grade against the approved material list.
Technical references Outokumpu high-alloy grade reference · ASTM steel standards directory
Prepare your enquiry
| Item | What to send |
|---|---|
| Product details | 317L · standard · NPS and schedule or OD and wall · length · traceability |
| Delivery | Quantity with units, delivery city and required date if known |
| Acceptance | Required certificates and inspection scope; attach the drawing revision where applicable |
UNS S31703 — A molybdenum-alloyed austenitic grade distinct from 316L.
It may be quoted as an alternative only if your procurement process permits it. Engineering acceptance is separate from a commercial quotation.
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