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MLTI Private Limited is a leading Stainless Steel 316Ti Tube manufacturer, supplier and exporter, producing high-grade tubing at its facility in Gujarat, India, with an annual capacity of approximately 8,000 metric tonnes.
Grade 316Ti is the titanium-stabilised austenitic option in the 316 group, carries UNS S31635, and is produced here to ASTM A213 / ASME SA-213 TP316Ti in the seamless route and to ASTM A554 in the welded and ERW routes. Chromium sits at 16.0 to 18.0%, nickel at 10.0 to 14.0% and molybdenum at 2.00 to 3.00%, with titanium held between a floor of five times carbon plus nitrogen and a 0.70% ceiling. Molybdenum provides essential resistance against chloride-induced pitting corrosion. Additionally, titanium stabilises the alloy by tying up carbon as titanium carbide, so chromium carbide cannot precipitate at the grain boundaries during prolonged exposure between 425 °C and 815 °C. Chromium therefore stays in solid solution, which makes grade 316Ti a better choice than unstabilised 316 for long-term elevated-temperature service. Annealed material meets 515 MPa minimum tensile strength, 205 MPa minimum yield and 35% minimum elongation.
Within this grade, buyers choose between two constructions. An SS 316Ti seamless tube is pierced from a solid billet and cold-drawn to size with no seam anywhere in the section, handling higher pressure and aggressive media, while a welded 316Ti tube is roll-formed and seam-fused, giving tighter wall tolerance, longer lengths and lower cost.
Heat exchangers, condensers, chemical circuits and exhaust systems absorb most of the output; small-bore stainless steel tubing goes to instrument lines. We hold ISO 14001 and 45001 certifications with BIS, EIL, IBR and PED 2014/68/EU approvals.
We supply solution-treated SS 316Ti round, square, and rectangular tubes manufactured to ASTM standards and custom tolerances. The specifications of the same have been given below.
| Parameter | Value |
|---|---|
| Applicable standards | ASTM A213 / ASME SA-213 (Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes), EN 10216-5 (1.4571), ASTM A554 (Welded Stainless Steel Mechanical Tubing) |
| Manufacturing form | Seamless (ASTM A213 / EN 10216-5); welded and ERW (ASTM A554) |
| Section profile | Round, square, rectangular |
| Outside diameter, round | 12.7 mm to 101.6 mm (1/2" to 4") |
| Wall thickness, round | Seamless: 1.07 mm to 3.40 mm (19 BWG to 10 BWG); Welded and ERW: 1.02 mm to 3.25 mm (19 SWG to 10 SWG) |
| Square section | 12 x 12 mm to 100 x 100 mm, wall 1.0 mm to 6.0 mm |
| Rectangular section | 13 x 25 mm to 100 x 50 mm, wall 1.0 mm to 6.0 mm |
| Length | Up to 24 metres round; up to 12 metres box section; cut to nominated length |
| Condition | Solution treated at 1040 °C minimum, water or other rapid cool |
| Surface finish | Pickled and passivated; polished to order |
| End type | Plain end, cut to specified length |
SS 316Ti chemical composition to ASME SA-213 sets carbon at 0.08% maximum, chromium 16.0 to 18.0%, nickel 10.0 to 14.0% and molybdenum 2.00 to 3.00%. Limits for grade 316Ti, UNS S31635, are given in the table below.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulphur (S) | 0.030 max |
| Silicon (Si) | 0.75 max |
| Chromium (Cr) | 16.0 to 18.0 |
| Nickel (Ni) | 10.0 to 14.0 |
| Molybdenum (Mo) | 2.00 to 3.00 |
| Nitrogen (N) | 0.10 max |
| Titanium (Ti) | 5 x (C + N) min, 0.70 max |
| Iron (Fe) | Balance |
Mechanical properties for annealed SS 316Ti tubes are defined by ASME SA-213, with required acceptance limits for strength, elongation, and hardness detailed in the table below.
| Property | Value |
|---|---|
| Tensile strength, min | 515 MPa (75 ksi) |
| Yield strength, 0.2% offset, min | 205 MPa (30 ksi) |
| Elongation in 50 mm, min | 35 % |
| Hardness, max | 192 HBW / 200 HV / 90 HRB |
Allowable stress at design temperature is not a grade constant. Titanium carbonitrides are abrasive, so machinability trails 316.
Stainless steel 316Ti is recognised globally under various international standards, enabling seamless material cross-referencing for global engineering, design, and procurement specifications.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | UNS S31635 |
| Europe (EN / W.Nr.) | X6CrNiMoTi17-12-2, 1.4571 |
| Germany (legacy DIN) | DIN 1.4571 |
| Japan (JIS) | SUS 316Ti; SUS316TiTB to JIS G 3463 |
| China (GB/T) | 06Cr17Ni12Mo2Ti, S31668 |
| UK (BS) | 320S31 |
| France (AFNOR) | Z6CNDT17-12 |
| Sweden (SIS) | SS 2350 |
| Russia (GOST) | 10Kh17N13M2T |
An enquiry for 1.4571 tube and one for UNS S31635 tube call up identical material.
Type 316Ti tube reaches the market in five variants: two manufacturing processes, seamless and welded, and three sections, round, square and rectangular.
316Ti seamless tube leaves the piercing mill as a hollow and takes a cold draw to the finished dimension. No weld exists anywhere in the section. ASTM A213 / ASME SA-213 covers the route, and superheater elements are its main destination.
316Ti welded tube begins with a slit strip, formed through rolls and closed by a high-frequency resistance weld before solution treatment. Electric resistance welding accounts for the bulk of our output; ASTM A554 covers the welded route.
The round section spans the whole diameter band and accounts for most of the 316Ti tubing we despatch. Exchanger bundles, condenser nests and instrument lines specify it.
Our 316Ti square tube covers 12 x 12 mm up to 100 x 100 mm, walls of 1.0 to 6.0 mm, lengths up to 12 metres. Frames and guarding inside a corrosive plant take it.
Rectangular profiles cover 13 x 25 mm through 100 x 50 mm, with walls as for a square section. Fabricators pick this shape when a member is loaded in one plane.
Stainless steel 316Ti tube sizes are set by actual outside diameter and wall gauge. The following round diameters, plus stainless steel square tube sizes and stainless steel rectangular tubing sizes, make up the AISI 316Ti tube programme in the stainless steel tubing sizes chart below.
| Size | OD (mm) | 10 BWG (3.40 mm) Weight/MTR | 12 BWG (2.77 mm) Weight/MTR | 14 BWG (2.11 mm) Weight/MTR | 16 BWG (1.65 mm) Weight/MTR | 18 BWG (1.25 mm) Weight/MTR | 19 BWG (1.07 mm) Weight/MTR |
|---|---|---|---|---|---|---|---|
| 1/2" | 12.7 | 0.78 | 0.68 | 0.55 | 0.45 | 0.35 | 0.31 |
| 5/8" | 15.875 | 1.05 | 0.89 | 0.72 | 0.58 | 0.45 | 0.39 |
| 3/4" | 19.05 | 1.31 | 1.11 | 0.88 | 0.71 | 0.55 | 0.47 |
| 1" | 25.4 | 1.85 | 1.55 | 1.21 | 0.97 | 0.74 | 0.64 |
| 1 1/4" | 31.75 | 2.38 | 1.98 | 1.54 | 1.23 | 0.92 | 0.81 |
| 1 1/2" | 38.1 | 2.91 | 2.41 | 1.87 | 1.48 | 1.13 | 0.97 |
| 2" | 50.8 | 3.98 | 3.28 | 2.53 | 2.00 | 1.52 | 1.31 |
| 2 1/2" | 63.5 | 5.04 | 4.15 | 3.19 | 2.52 | 1.91 | 1.64 |
| 3" | 76.2 | 6.11 | 5.01 | 3.85 | 3.04 | 2.30 | 1.98 |
| 3 1/2" | 88.9 | 7.18 | 5.88 | 4.51 | 3.55 | 2.69 | 2.31 |
| 4" | 101.6 | 8.24 | 6.75 | 5.17 | 4.07 | 3.08 | 2.65 |
| Size | OD (mm) | 10 SWG (3.25 mm) Weight/Mtr | 12 SWG (2.64 mm) Weight/Mtr | 14 SWG (2.03 mm) Weight/Mtr | 16 SWG (1.63 mm) Weight/Mtr | 18 SWG (1.22 mm) Weight/Mtr | 19 SWG (1.02 mm) Weight/Mtr |
|---|---|---|---|---|---|---|---|
| 1/2" | 12.7 | 0.75 | 0.65 | 0.55 | 0.45 | 0.34 | 0.29 |
| 5/8" | 15.875 | 1.01 | 0.86 | 0.72 | 0.58 | 0.44 | 0.37 |
| 3/4" | 19.05 | 1.26 | 1.06 | 0.88 | 0.71 | 0.53 | 0.45 |
| 1" | 25.4 | 1.76 | 1.47 | 1.21 | 0.97 | 0.72 | 0.61 |
| 1 1/4" | 31.75 | 2.27 | 1.88 | 1.54 | 1.23 | 0.91 | 0.76 |
| 1 1/2" | 38.1 | 2.77 | 2.29 | 1.88 | 1.49 | 1.10 | 0.92 |
| 2" | 50.8 | 3.78 | 3.11 | 2.54 | 2.01 | 1.48 | 1.24 |
| 2 1/2" | 63.5 | 4.79 | 3.93 | 3.20 | 2.53 | 1.85 | 1.55 |
| 3" | 76.2 | 5.79 | 4.75 | 3.86 | 3.05 | 2.23 | 1.87 |
| 3 1/2" | 88.9 | 6.80 | 5.57 | 4.52 | 3.57 | 2.61 | 2.18 |
| 4" | 101.6 | 7.81 | 6.39 | 5.18 | 4.09 | 2.99 | 2.50 |
Inside diameter equals the OD minus twice the wall: 25.4 mm on 16 SWG gives 22.1 mm. Thin-wall tubing at 1.02 mm (19 SWG) runs across the full 12.7 mm to 101.6 mm diameter band, and heavy-wall stainless steel tubing beyond 3.40 mm ranges as per the order.
Alloy 316Ti tube is specified where sustained heat and chloride attack occur together. Five sectors account for most dispatches.
Shell-and-tube bundles carrying warm brine or acid condensate are the classic 316Ti duty, and ASME SA-213 names that equipment in its title. Tube-to-tubesheet joints are rolled and seal welded without a later anneal.
Dosing lines, jacketed reactor coils and stripper overhead condensers handling sulphuric or phosphoric acid take SS 316Ti tube. Site repairs are welded in position, so grain-boundary chemistry decides selection.
Superheater elements and economiser coils sit inside the sensitisation window in normal operation. Feedwater heater nests run far cooler and take 316Ti for its chloride and condensate resistance rather than for stabilisation. IBR approval lets us supply boiler-code work within India, and each length is subjected to the hydrostatic test or the non-destructive electric test in accordance with ASTM A213.
Turbo manifolds, downpipes and generator-set flue runs meet acidic condensate on cold start, then scale heat at load. 316 Ti outlasts unstabilised material on that cycle.
Brackish and low-chloride cooling circuits, deck service lines and bleach liquor lines share one driver: chlorides at temperature. Full seawater and stagnant chloride duty calls for a higher-molybdenum or duplex grade rather than 316Ti.
The 316Ti vs 316L decision turns on service temperature, not corrosion chemistry. In ambient aqueous media, the two are interchangeable, and 316L is cost-efficient. Specify 316 Ti tube where a welded assembly is held between 425 and 815 °C, or where a European drawing calls out 1.4571. 316L reaches comparable intergranular resistance by cutting carbon to 0.035% maximum, which costs strength: 170 MPa yield against 205 MPa for 316-Ti tube.
We package and ship Type 316Ti tubes with maximum protection to ensure damage-free transit.
We price stainless steel 316Ti tube by the kilogram, indexed to alloy cost on the quotation date; there isn't a standing rate card. ₹500-₹650/kg, or approximately US$5.22-6.79/kg, for a normal Type 316Ti seamless tube order in India.
Rates from 316Ti stainless steel suppliers follow the nickel and molybdenum indices, and titanium lifts melt cost above plain 316. Six variables shift the figure: cut length, wall gauge, order tonnage, diameter, profile and finish. ERW material costs less than the seamless route, and the stainless steel 316Ti tube price in India reflects the test scope.
Buyers return to Moonlight Tubes for certified material, approved grades and stock that ships on schedule. Every order is backed by documented quality, a wide size range and delivery commitments we hold to.
TP is the ASTM prefix for tube product, used for the austenitic grades in ASTM A213. TP316Ti reads as tube product, Type 316Ti.
316Ti tube must hold titanium at five times carbon plus nitrogen as a floor, 0.70% as a cap. Plain 316 tube doesn't carry that requirement.
Composition to ASME SA-213 runs 0.08% carbon maximum, 16.0 to 18.0% chromium, 10.0 to 14.0% nickel and 2.00 to 3.00% molybdenum, with titanium at five times carbon plus nitrogen as a minimum and 0.70% maximum, and nitrogen 0.10% maximum.
ASME SA-213 covers seamless boiler, superheater and heat-exchanger tubes, and TP316Ti sits among its listed grades. Welded condenser tube falls under the companion standard ASTM A249 / ASME SA-249. A retube must recheck the wall against the tubesheet drilling.
Yes, every consignment carries an EN 10204 3.1 certificate covering heat analysis and tensile figures. Third-party inspection is arranged upon order.
Round SS 316Ti tubing runs from 12.7 mm to 101.6 mm outside diameter, with walls of 1.07 mm to 3.40 mm (19 BWG to 10 BWG) in the seamless range and 1.02 mm to 3.25 mm (19 SWG to 10 SWG) in the ERW range.