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Stainless steel grades
Request an SS 316H quote against your drawing. State the standard, manufacturing route, dimensions and required documentation.
Request a quoteTechnical reference
| Field | Order reference |
|---|---|
| Standard | A312 TP316H pipe or A213 TP316H seamless tubing when specified |
| Product or route | High-temperature austenitic grade, UNS S31609 |
| Critical dimensions and fit | Record the wall basis and hot-service material requirement from the drawing |
| 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: 38.1 × 3.2 mm straight replacement tube 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 |
|---|---|---|---|---|---|
| TP316H | S31609 | 0.04–0.10 | 16–18 | 2–3 | Controlled carbon range |
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) |
|---|---|---|
| TP316H | 515 | 205 |
Reference ASTM A312/A312M scope · CTS A312 technical reference · Tioga A312 pipe grade reference
Check heat treatment and any required grain-size or inspection 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 |
316 and 316L have separate order designations.
For the enquiry, record the wall basis and hot-service material requirement from the drawing.
A312 TP316H pipe or A213 TP316H seamless tubing when specified · 38.1 × 3.2 mm straight replacement tube example. Add quantity, lengths, delivery city and the required reports.
Ordering guidance
An enquiry for 316H should state that designation, the standard and the required condition and dimensions. It is a different procurement requirement from 316 or 316L and should be documented as such.
When a vendor quotes an alternative route or grade, keep it on a separate line for engineering review. Ask for the test and certificate requirements to be included in the offer so comparison does not depend on material name alone.
Check pricing and availability →
Buyer’s guide
316H is the high-temperature member of the 316 family identified by UNS S31609. When the equipment specification calls for 316H, the grade and applicable product standard should appear together on the technical offer. A generic 316-family certificate needs review before it can be accepted against a line that specifies the H grade.
A tube schedule may order a minimum wall or a nominal wall with a permitted tolerance. Those are different buying instructions even when the printed wall value is the same. Identify which basis applies, provide the actual OD and finished length, and flag bends or end preparation if the part must fit an existing assembly.
The product standard, project inspection plan and design authority decide the necessary acceptance checks. Provide the required delivery condition, tests, traceability and any witness points. If the supplier proposes a different grade, route or wall basis, request a separate deviation line before ordering.
A replacement for a hot exchanger line should identify the equipment tag, grade, tube specification, OD, minimum wall if specified, and tube length. Attach the drawing revision so the supplier can identify whether plain tubes or formed pieces are being requested.
Increased wall does not establish material equivalence. Refer any proposed change to the authority responsible for the hot-service design.
Technical references Alleima high-temperature tube grades · ASTM steel standards directory
Prepare your enquiry
| Item | What to send |
|---|---|
| Product details | 316H · product standard and edition · dimensions · route · required tests |
| Delivery | Quantity with units, delivery city and required date if known |
| Acceptance | Required certificates and inspection scope; attach the drawing revision where applicable |
UNS S31609 — The H designation identifies a distinct 316-family grade used in high-temperature tubing.
Treat it as a proposed material change. Refer it to the project authority before accepting it.
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