Seamless, cold-finished tubes in dual grade TP316/316L — the strength of standard 316 plus the weld-zone corrosion resistance of the low-carbon grade. For instrumentation, process lines and compression fittings.
State the OD × wall, finish and total metres — quotes back within 2 working hours.
| Standard | ASTM A269 / A213 |
|---|---|
| Grade | TP316/SS316 · TP316L/SS316L — dual grade |
| Range | 4 – 60 mm OD (1/4″ – 2″) |
| Length | 6 metres per length |
| Finish | Annealed & pickled · polished 320 grit · bright annealed |
| Certificate | EN 10204 3.1 standard · 3.2 on request |
Full dimension tables are in the catalogue below, as printed — common OD × wall combinations, composition and tolerances are on this page.
| At a glance | TP316 / SS316 | TP316L / SS316L |
|---|---|---|
| Max carbon | 0.08% | 0.035% |
| Min tensile | 515 MPa | 485 MPa |
| Choose when | Full strength | It will be welded |
| Aspect | Stainless steel tube | Stainless steel pipe |
|---|---|---|
| Sized on | OD and wall (4–60 mm) | Nominal bore and schedule (1/8″–4″) |
| Standard | ASTM A269 / A213 | ASTM A312 / ASME SA312 |
| Fixed dimension | Outside diameter, tight tolerance | Nominal bore designation (a label, not a measurement) |
| Joined by | Compression and twin-ferrule fittings gripping the OD | Threaded, welded, flanged |
| Typical duty | Instrument, control, process lines | Bulk fluid runs, structural work |
| Bore | Moves with the wall chosen | Moves with the schedule chosen |
They are not interchangeable, and nothing converts between them. Need pipe? See A312 stainless steel pipes.
Chemical composition limits % by weight · as printed
| Element | TP316 / SS316 | TP316L / SS316L |
|---|---|---|
| Carbon (C) | 0.08 max | 0.035 max |
| Chromium (Cr) | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | 10.0 – 14.0 | 10.0 – 14.0 |
| Molybdenum (Mo) | 2.00 – 3.00 | 2.00 – 3.00 |
| Manganese (Mn) | 2.00 max | 2.00 max |
| Silicon (Si) | 1.00 max | 1.00 max |
| Phosphorus (P) | 0.045 max | 0.045 max |
| Sulphur (S) | 0.030 max | 0.030 max |
Mechanical properties annealed condition
| Property | TP316 / SS316 | TP316L / SS316L |
|---|---|---|
| Tensile strength, min | 515 MPa / 75 ksi | 485 MPa / 70 ksi |
| Yield strength (0.2%), min | 205 MPa / 30 ksi | 170 MPa / 25 ksi |
| Elongation in 50 mm, min | 35% | 35% |
| Hardness, max | 90 HRB | 90 HRB |
Weight & bending: kg/m = 0.02507 × wall × (OD − wall), density 7.98 g/cm³ — e.g. 12 × 1.5 mm = 0.395 kg/m. Minimum cold bend radius is 3× OD; three-roll benders for large radii, rotary-draw/mandrel for tight ones.
| OD | Wall thicknesses | Nearest imperial |
|---|---|---|
| 6 mm | 1.0 · 1.5 mm | 1/4″ |
| 8 mm | 1.0 · 1.5 mm | 5/16″ |
| 10 mm | 1.0 · 1.5 · 2.0 mm | 3/8″ |
| 12 mm | 1.0 · 1.5 · 2.0 mm | 1/2″ |
| 16 mm | 1.5 · 2.0 mm | 5/8″ |
| 20 mm | 1.5 · 2.0 · 2.5 mm | 3/4″ |
| 22 mm | 2.0 · 2.5 mm | 7/8″ |
| 25 mm | 2.0 · 2.5 · 3.0 mm | 1″ |
| 28 mm | 2.0 · 2.5 · 3.0 mm | 1 1/8″ |
| 32 mm | 2.0 · 2.5 · 3.0 mm | 1 1/4″ |
| 38 mm | 2.5 · 3.0 mm | 1 1/2″ |
| 50 mm | 2.5 · 3.0 mm | 2″ |
| 60 mm | 3.0 mm | 2 3/8″ |
Tolerances ASTM A213 / A269
| OD range | OD tolerance |
|---|---|
| 4 – 35 mm | ± 0.08 mm |
| >35 – 38 mm | ± 0.15 mm |
| >38 – 60 mm | ± 0.20 mm |
| >60 mm | ± 0.25 mm |
Wall tolerance: our standard is ±10% (average wall thickness) — compliant with both A269 and A213. A213 also permits minimum wall thickness (+20% / −0%) — available on request with a minimum quantity. For more corrosive service, specify MO2.5 (min 2.5% molybdenum).
Transporting corrosive chemicals, acids and solvents — sulfuric acid, hydrochloric acid, caustic soda.
Offshore platforms, refineries and pipelines — crude oil, natural gas, petrochemicals; drilling equipment and heat exchangers.
Seawater desalination plants, shipbuilding, offshore structures — the molybdenum gives the chloride resistance.
Boilers and HVAC systems for heat and fluid transfer; automotive and instrumentation lines too.
Dimensions and weights per size are in the catalogues, as printed; stock and price are not — send the list and we confirm both.
If the tube will be welded during fabrication, specify SS316L — the lower carbon reduces carbide precipitation. Our stock is dual-spec SS316/316L, satisfying either callout.
Yes — SS316 is highly resistant to seawater corrosion, ideal for marine and offshore structures. For more corrosive service, specify MO2.5 with minimum 2.5% molybdenum.
±10%, compliant with both ASTM A269 and A213 — that is average wall thickness (AWT), market standard practice. Minimum wall thickness on request with a minimum quantity.
An EN 10204 3.1 certificate comes as standard; 3.2 (countersigned by a third-party inspector) if contractually required — request before the order. Every length carries its heat number continuously along the tube.
Annealed & pickled (AP): acid treatment removes post-annealing oxides — the process standard. Bright annealed (BA): closed-furnace annealing under hydrogen — a bright surface. Polished 320 grit: polished for appearance and cleanliness.
Annealed: TP316 515 MPa tensile / 205 MPa yield; TP316L 485 MPa / 170 MPa. Elongation 35% minimum in 50 mm, hardness capped at 90 HRB.
kg/m = 0.02507 × wall × (OD − wall), both in mm, density 7.98 g/cm³. Example: 12 × 1.5 mm = 0.395 kg/m.
Minimum cold bend radius 3× OD. Three-roll benders for large radii; rotary-draw / mandrel benders for tight ones — protect the surface from carbon contamination and scoring.
SS316 resists corrosion better — the molybdenum (2.0–3.0%) is what gives it the edge; SS304 has none.
Yes — 4 to 60 mm in 6 metre lengths in our regional warehouses in Singapore and Malaysia; out within 24 hours of your PO, quotes within 2 working hours.
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