SS 310 / 310S Pipe & TubeASTM A312 TP310S · Manufacturer, stockist & exporter, India
Also sold as AISI 310S · UNS S31008 · W.Nr 1.4845 · Heat-resisting stainless
SS 310 / 310S pipe is supplied seamless to ASTM A312 TP310S and welded to ASTM A312 · A358, in ASME pipe sizes and schedules, with tube to ASTM A213. It is a heat-resisting austenitic stainless steel with 25% chromium and 20% nickel, chosen for furnaces, burners and heat treatment at high temperature. Kanak Steel & Engineering Co. supplies it with EN 10204 3.1 mill certificates from Mumbai to buyers across India, the Gulf, South-East Asia, South America, Europe, the UK and the USA.
- Stock & mill supply
- EN 10204 3.1 / 3.2
- PMI on request
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is SS 310 / 310S Pipe & Tube?
SS 310 / 310S pipe & tube is a heat-resisting austenitic stainless steel with 25% chromium and 20% nickel supplied as pipe & tube to ASTM A312 TP310S (UNS S31008). Buyers specify it for furnaces, burners and heat treatment at high temperature. It is also sold as AISI 310S, UNS S31008, W.Nr 1.4845.
- What it is
- Heat-resisting austenitic stainless steel with 25% chromium and 20% nickel
- Seamless
- ASTM A312 TP310S
- Welded
- ASTM A312 · A358
- Sizes
- NPS ⅛" – 24" · OD tube to order
- Schedules
- 5S · 10S · 40S · 80S · 160 · XXS
- Best at
- Furnaces, burners and heat treatment at high temperature
SS 310 / 310S Pipe & Tube Specification & Sizes
| Seamless pipe | ASTM A312 TP310S |
|---|---|
| Welded pipe | ASTM A312 · A358 |
| Tube | ASTM A213 |
| Grade | SS 310 / 310S · UNS S31008 (310S) · S31000 (310) · W.Nr 1.4845 |
| Size & schedule | NPS ⅛" to 24" to ASME B36.19 / B36.10; OD × wall for tube |
| Length | Single random, double random, or cut lengths |
| Ends | Plain end · bevelled end (for welding) · threaded |
| Testing | Hydrostatic or eddy-current · PMI · flattening & flaring · IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
SS 310 / 310S Pipe: Seamless, Welded or Tube?
Three different specifications cover 310S tubular products. Pick the route first — it decides price, test requirements and lead time. General requirements (tolerances, hydrostatic or electric testing) come from ASTM A999. Schedules, the −12.5% wall tolerance and the B31.3 wall formula are explained in the pipe guide.
| Route | Specification | Use it for |
|---|---|---|
| Seamless pipe | ASTM A312 TP310S | Pressure and critical service; no weld seam to inspect. |
| Welded pipe | ASTM A312 · A358 | Economical in larger diameters and thinner walls where the code allows it. |
| Tube | ASTM A213 | Heat exchangers and instruments; ordered by exact OD × wall. |
SS 310 / 310S Pipe Wall & Weight by Schedule
For the same size, the schedule sets the wall — and the weight you pay for. Cross-sections are drawn to scale for 2" NPS (OD 60.33 mm, ASME B36.19); weights use the density of SS 310 / 310S, 7.9 g/cm³.
Other sizes: pipe schedule chart and weight calculator.
SS 310 / 310S Pipe & Tube Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Nickel | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Phosphorus | As specified |
| Sulphur | As specified |
| Iron | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM A240 for UNS S31008.
SS 310 / 310S Pipe & Tube Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
| Hardness | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM A240 for UNS S31008 — Annealed plate & sheet.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 7.9 g/cm³ |
| Melting range | 1400 – 1450 °C |
| Magnetic | Non-magnetic annealed |
| PREN (approx.) | ≈ 25 |
SS 310 / 310S Equivalent Grades
SS 310 / 310S Pipe Weight Chart (kg/m)
Weight per metre (kg/m) = (OD − WT) × WT × 0.02482, with OD and wall thickness in mm. The factor comes from SS 310 / 310S's density of 7.9 g/cm³.
Example: 4" Sch 40S (114.30 × 6.02 mm)
(114.30 − 6.02) × 6.02 × 0.02482 = 16.18 kg/m
| NPS | OD mm | Sch 10S kg/m | Sch 40S kg/m |
|---|---|---|---|
| ½" | 21.34 | 1.01 | 1.28 |
| 1" | 33.40 | 2.11 | 2.52 |
| 2" | 60.33 | 3.96 | 5.48 |
| 3" | 88.90 | 6.50 | 11.36 |
| 4" | 114.30 | 8.42 | 16.18 |
| 6" | 168.28 | 13.91 | 28.44 |
| 8" | 219.08 | 20.09 | 42.82 |
Six-digit Harmonized System heading (iron and steel, chapter 72–73). Your country adds its own digits — confirm with your customs broker. All HS codes.
How to Verify SS 310 / 310S Pipe & Tube with PMI
Positive material identification with a handheld XRF gun confirms the alloy on the piece itself, in seconds, before it is cut or welded. SS 310 / 310S is most often mixed up with SS 304 — the table shows which elements tell them apart.
Handheld XRF does not measure carbon or nitrogen; those come from the mill certificate or optical emission (OES) testing. PMI can be arranged on request — state it on your enquiry.
Under technical review for TDS.
| Element | SS 310 / 310S | SS 304 |
|---|---|---|
| Nickel | As specified | As specified |
| Chromium | As specified | As specified |
| Iron | As specified | As specified |
| Manganese | As specified | As specified |
SS 310 / 310S Pipe & Tube Price — What Decides It
Two quotes for "310S pipe & tube" can differ by 20% and both be fair. We quote 310S pipe & tube per kg for full sizes and per piece for cut sizes. These six things move the price per kg, so you can compare offers like for like.
SS 310 / 310S Pipe & Tube Applications
SS 310 / 310S is specified when the cheaper grade will not survive the service but a higher alloy would be more than the job needs. These are the jobs our buyers use it for.
SS 310 / 310S Pipe & Tube vs 304, 321 and 800
| Grade | Pipe & Tube standard | PREN (approx.) | Pick it when |
|---|---|---|---|
| Incoloy 800 / 800H / 800HT | ASTM B407 | — | Furnaces, petrochemical heaters and high-temperature piping |
| SS 304 | ASTM A312 TP304 | ≈ 18 | General corrosion resistance, food, water and architectural work |
| SS 321 | ASTM A312 TP321 | ≈ 18 | High-temperature service between 425 and 815 °C |
| SS 310 / 310S | ASTM A312 TP310S | ≈ 25 | Furnaces, burners and heat treatment at high temperature |
PREN = Cr + 3.3 Mo + 16 N, from mid-range chemistry. A screening guide, not a substitute for corrosion data on your medium.
SS 310 / 310S Corrosion Resistance — Element by Element
Each alloying addition has a job. Knowing which one protects against your medium is the quickest way to judge whether 310S fits.
25% chromium builds a tight scale that resists oxidation in continuous service up to about 1100 °C.
20% nickel keeps the alloy austenitic and strong at furnace temperatures.
Silicon improves resistance to scaling and carburising atmospheres.
Without molybdenum, 310S is not a chloride grade — use it for heat, not for seawater.
How your 310S pipe & tube order runs
- 01Enquiry review — we confirm size, standard edition and documents against your MR or drawing.
- 02Heat selection & PMI — the mill certificate is checked against your order; PMI before processing is available on request.
- 03Processing — cutting, machining or bevelling to your specification, with heat numbers marked.
- 04Inspection — your third-party inspector witnesses, or we share photos and test reports.
- 05Packing & dispatch — seaworthy packing from Nhava Sheva (JNPT), Mumbai, FOB or CIF, documents sent before the vessel sails.
Standards on this page
Welding & Fabricating SS 310 / 310S Pipe & Tube
SS 310 / 310S welds by all common arc processes. A few points our buyers ask about:
| Matching filler | ER310 (AWS A5.9) |
|---|---|
| Over-alloyed filler | ERNiCr-3 for joints to nickel alloys |
| Preheat | Not required; keep interpass temperature low |
| Cutting | Thermal or abrasive cutting; grind off heat-tinted edges before welding |
Follow your approved WPS; this is general guidance. See also 310S fittings and 310S flanges for the matching pipe-system parts.
How to Order SS 310 / 310S Pipe & Tube: RFQ Checklist
Get an accurate quote the first time. Copy this list into your enquiry:
- Seamless or welded, and the standard
- NPS and schedule (or OD × wall for tube)
- Length — random or cut, and number of lengths
- End finish — plain, bevelled or threaded
- Certificate type and extra tests
- Delivery port, Incoterm and required date
SS 310 / 310S pipe & tube for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSS 310 / 310S pipe & tube — questions buyers ask
Is SS 310 / 310S the same as AISI 310S?
AISI 310S, UNS S31008, W.Nr 1.4845 are names used for SS 310 / 310S (W.Nr / EN numbers and older UNS variants are the closest designations; their limits can differ slightly, so specify the UNS number and ASTM grade on the order), and pipe & tube is ordered to ASTM A312 TP310S whichever name is on the enquiry.
What is the difference between SS 310 / 310S pipe and tube?
Pipe is ordered by nominal pipe size and schedule, for carrying fluids. Tube is ordered by exact outside diameter and wall, for heat exchangers and instruments, and is held to tighter tolerances.
Seamless or welded SS 310 / 310S pipe — which should I buy?
Seamless (ASTM A312 TP310S) is the default for pressure and critical service. Welded (ASTM A312 · A358) is cheaper in larger diameters and thinner walls and is accepted where the design code allows it.
What is the wall-thickness tolerance on SS 310 / 310S pipe?
Seamless pipe is normally allowed −12.5% on nominal wall under its general-requirements standard (ASTM A999). Allow for it in the pressure calculation or order on minimum wall.
Can SS 310 / 310S pipe be welded to carbon-steel pipe?
Yes, with the right filler: ER309L (or E309L electrode) is the usual filler when joining it to carbon steel. Follow a qualified WPS.
SS 310 / 310S or Incoloy 800 / 800H / 800HT — which should I choose?
SS 310 / 310S is chosen for furnaces, burners and heat treatment at high temperature. Incoloy 800 / 800H / 800HT is the step up when you need more pitting resistance or strength. See the comparison table on this page, or ask us with your process conditions.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026