SS 316 Stainless Steel Seamless Pipe - TP316 / 316L / 316H / 316Ti to ASTM A312
316L stainless steel pipe and the wider 316 stainless pipe family get their edge from 2 to 3% molybdenum, which stops chlorides pitting the bore as they pit 304. There is no weld line on a seamless pipe and it helps in maintaining the same resistance throughout the wall. SS 316 / 316L / 316H / 316Ti pipes have 16-18% chromium and 10-14% nickel. 316L prevents carbon from exceeding 0.035%; 316H keeps the level of carbon between 0.04 and 0.1%, ensuring a high strength above the temperature of 525 degrees Celsius and 316Ti includes titanium in the structure of the alloy to protect the weld during the prolonged heating. All four are made to ASTM A312. Metinox Overseas supplies them from Mumbai within its seamless pipes range.
Table of content
- SS 316 Seamless Pipe Grade Comparison - 316L, 316H and 316Ti
- SS 316L / 316H / 316Ti Seamless Pipe Specifications
- Chemical Composition of SS 316 / 316L / 316H / 316Ti Seamless Pipe - ASTM A312
- Mechanical Properties of SS 316 / 316L / 316H / 316Ti Seamless Pipe After Annealing
- Physical Properties of SS 316 Seamless Pipe - All Grades
- Equivalent Grades for SS 316 / 316L / 316H / 316Ti Seamless Pipe
- SS 316 Seamless vs Welded Pipe Pressure Ratings - ASME B31.3
- Where SS 316 / 316L / 316H Seamless Pipe Is Used - By Industry
- SS 316 Seamless Pipe Exporter in India: Packing and Dispatch
- 316 Seamless SS Pipe FAQs
SS 316 Seamless Pipe Grade Comparison - 316L, 316H and 316Ti
| Point | 316 | 316L | 316H | 316Ti |
| UNS | S31600 | S31603 | S31609 | S31635 |
| Carbon | 0.08% max | 0.035% max | 0.04 to 0.10% | 0.08% max |
| Titanium | None | None | None | 5 x (C + N) min, 0.70% max |
| Grain size rule | None | None | ASTM No. 7 or coarser | None |
| Minimum tensile / yield | 515 / 205 MPa | 485 / 170 MPa | 515 / 205 MPa | 515 / 205 MPa |
| Usual seamless use | Pressure lines; dual certified stock | Welded small bore process and instrument systems | Steam and heater lines above about 525 °C | European designed plants; welded lines that also see long heat |
SS 316L / 316H / 316Ti Seamless Pipe Specifications
| Item | Range |
| Standard | ASTM A312 / ASME SA312, TP316, TP316L, TP316H, TP316Ti |
| European standard | EN 10216-5 (seamless), 1.4401 / 1.4404 / 1.4919 / 1.4571 |
| Size range | NPS 1/8 to 12 (10.3 to 323.8 mm OD) in stock sizes; larger hot finished sizes on request |
| Schedules | Sch 10S, 40S, 80S, 160, XS, XXS |
| Finish route | Hot finished or cold finished |
| Length | Single random, double random or cut to length; 5.8 m and 11.8 m for containers |
| Ends | Plain, bevelled to ASME B16.25, threaded on small bore |
| Surface | Annealed and pickled; bright annealed on cold finished sizes on request |
| Certificates | EN 10204 3.1; 3.2 through an independent inspector on request |
Chemical Composition of SS 316 / 316L / 316H / 316Ti Seamless Pipe - ASTM A312
| Element, % | TP316 | TP316L | TP316H | TP316Ti |
| Carbon | 0.08 max | 0.035 max | 0.04 to 0.10 | 0.08 max |
| Manganese | 2.00 max | 2.00 max | 2.00 max | 2.00 max |
| Silicon | 1.00 max | 1.00 max | 1.00 max | 0.75 max |
| Phosphorus | 0.045 max | 0.045 max | 0.045 max | 0.045 max |
| Sulphur | 0.030 max | 0.030 max | 0.030 max | 0.030 max |
| Chromium | 16.0 to 18.0 | 16.0 to 18.0 | 16.0 to 18.0 | 16.0 to 18.0 |
| Nickel | 10.0 to 14.0 | 10.0 to 14.0 | 10.0 to 14.0 | 10.0 to 14.0 |
| Molybdenum | 2.00 to 3.00 | 2.00 to 3.00 | 2.00 to 3.00 | 2.00 to 3.00 |
| Nitrogen | 0.10 max | 0.10 max | n/a | 0.10 max |
| Titanium | n/a | n/a | n/a | 5 x (C + N) min, 0.70 max |
Mechanical Properties of SS 316 / 316L / 316H / 316Ti Seamless Pipe After Annealing
| Property | TP316 | TP316L | TP316H | TP316Ti |
| Tensile strength, min | 515 MPa (75 ksi) | 485 MPa (70 ksi) | 515 MPa (75 ksi) | 515 MPa (75 ksi) |
| Yield strength (0.2% offset), min | 205 MPa (30 ksi) | 170 MPa (25 ksi) | 205 MPa (30 ksi) | 205 MPa (30 ksi) |
| Elongation in 50 mm, min | 35% / 25% | 35% / 25% | 35% / 25% | 35% / 25% |
| Grain size | Not specified | Not specified | ASTM No. 7 or coarser | Not specified |
| Hardness | No limit for pipe; 217 HB / 95 HRB is the ASTM A240 plate limit, for reference only | Same | Same | Same |
Physical Properties of SS 316 Seamless Pipe - All Grades
| Property | 316, 316L and 316H | 316Ti |
| Density | 7.98 g/cm³ (0.288 lb/in³) | 7.98 g/cm³ |
| Melting range | 1375 to 1400 °C | 1375 to 1400 °C |
| Elastic modulus | 193 GPa | 193 GPa |
| Mean thermal expansion, 0 to 100 °C | 15.9 µm/m·°C | 16.5 µm/m·°C |
| Mean thermal expansion, 0 to 538 °C | 17.5 µm/m·°C | 18.5 µm/m·°C |
| Thermal conductivity at 100 °C | 16.3 W/m·K | 16.3 W/m·K |
| Specific heat, 0 to 100 °C | 500 J/kg·K | 500 J/kg·K |
| Electrical resistivity | 0.74 µΩ·m | 0.74 µΩ·m |
| Scaling in air | about 870 °C intermittent, 925 °C continuous | Same |
Equivalent Grades for SS 316 / 316L / 316H / 316Ti Seamless Pipe
| Standard | 316 | 316L | 316H | 316Ti |
| UNS | S31600 | S31603 | S31609 | S31635 |
| EN / Werkstoff No. | 1.4401 (X5CrNiMo17-12-2) | 1.4404 (X2CrNiMo17-12-2) | 1.4919 (X6CrNiMoB17-12-2) | 1.4571 (X6CrNiMoTi17-12-2) |
| JIS | SUS316 | SUS316L | SUS316H (SUS316HTB for tube) | SUS316Ti |
| BS | 316S31 | 316S11 | 316S51 | 320S31 |
| GOST | n/a | 03Kh17N14M3 | n/a | 08Kh17N13M2T |
SS 316 Seamless vs Welded Pipe Pressure Ratings - ASME B31.3
Calculation method - ASME B31.3:: P = 2SEt / (D − 2Yt), with S = 138 MPa for 316, 316H and 316Ti and 115 MPa for 316L, E = 1.0 seamless and 0.85 welded, Y = 0.4 and t = nominal wall less 12.5%.
The welded column is shown for comparison only. For welded 316 pipe see our SS 316 / 316L welded pipe page.
All pressures in bar (psi).
| NPS | Sch 40S- 316, 316H, 316Ti | Sch 40S- 316L | Sch 40S welded (E 0.85) - 316 | Sch 80S- 316, 316H, 316Ti | Sch 80S- 316L |
| 1/2 | 346 (5,011) | 288 (4,176) | 294 (4,260) | 482 (6,991) | 402 (5,826) |
| 3/4 | 281 (4,071) | 234 (3,393) | 239 (3,461) | 394 (5,715) | 328 (4,763) |
| 1 | 263 (3,815) | 219 (3,179) | 224 (3,243) | 364 (5,275) | 303 (4,395) |
| 1 1/2 | 194 (2,819) | 162 (2,349) | 165 (2,396) | 274 (3,977) | 228 (3,314) |
| 2 | 164 (2,379) | 137 (1,983) | 139 (2,022) | 237 (3,439) | 198 (2,866) |
| 3 | 156 (2,261) | 130 (1,884) | 132 (1,922) | 220 (3,194) | 184 (2,662) |
| 4 | 132 (1,915) | 110 (1,596) | 112 (1,628) | 191 (2,768) | 159 (2,307) |
| 6 | 105 (1,525) | 88 (1,271) | 89 (1,296) | 165 (2,392) | 137 (1,994) |
| 8 | 93 (1,343) | 77 (1,119) | 79 (1,141) | 146 (2,116) | 122 (1,763) |
| 10 | 84 (1,218) | 70 (1,015) | 71 (1,036) | 116 (1,684) | 97 (1,404) |
| 12 | 73 (1,053) | 60 (877) | 62 (895) | 97 (1,413) | 81 (1,177) |
Where SS 316 / 316L / 316H Seamless Pipe Is Used - By Industry
| Industry | Typical seamless lines |
| Chemical | 316L process lines in chloride bearing streams |
| Pharmaceutical and food | Cold finished 316L purified water and process lines |
| Marine and offshore | 316L utility and instrument lines in salt air |
| Power generation | 316H steam and heater lines |
| Refining and petrochemical | 316H and 316Ti hot process lines |
| Pulp and paper | 316L and 316Ti liquor and bleach plant lines |
SS 316 Seamless Pipe Exporter in India: Packing and Dispatch
- Plastic end caps on plain ends; bevel protectors on bevelled ends
- Hexagonal bundles with non-metallic straps
- Wooden crates for small bore and bright annealed pipe
- No contact with carbon steel slings or racks
- Each bundle labelled with grade, SMLS, size and heat number
- Cut to 5.8 m or 11.8 m for 20 ft and 40 ft containers
- Sea-worthy wrapping for export
Before you order: For warm or stagnant seawater service, SS 316L is the wrong grade. See 904L seamless pipe for the correct specification.
316 Seamless SS Pipe FAQs
Carbon. 316 allows up to 0.08% and 316L up to 0.035%, so 316L welds keep their corrosion resistance. 316 has slightly higher minimum strength, and dual certified 316/316L gives both.
Choose 316H for pressure lines above about 525 °C, where creep strength governs. Choose 316Ti when welds must stay protected through long service between about 425 and 815 °C, or when a European specification names 1.4571.
ASTM A312 / ASME SA312, grades TP316, TP316L, TP316H and TP316Ti, with general requirements in ASTM A999 and sizes to ASME B36.19M.
For pressure, yes: seamless pipe takes a joint factor of 1.0 in ASME B31.3 against 0.85 for welded pipe without full radiography. For low pressure utility lines, welded pipe is often better value.
About 5.53 kg per metre (3.71 lb/ft) for the nominal 60.3 x 3.91 mm size at 7.98 g/cm³.
316HiMo is a trade name for 316 made near the top of its molybdenum range. It has no ASTM or UNS designation, so pipe is ordered as TP316 or TP316L with a minimum molybdenum stated on the order.
It handles salt air and some intermittent seawater, but warm or stagnant seawater causes pitting and crevice corrosion. For continuous seawater service, duplex or higher alloy grades are normally used.
Send the grade, SMLS, OD and wall or NPS and schedule, length, quantity, ends, hot or cold finished if it matters, certification, inspection and destination port.
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