01
316 Seamless Tube
316 seamless stainless steel tube carries no weld seam, so there's no heat-affected zone to act as a corrosion initiation site. We produce it to ASTM A213 / ASME SA-213 for boiler and heat exchanger duty.
Stainless Steel 316 Tube Manufacturer in India
MLTI Private Limited (Moonlight Tube Industries) is a 316 stainless steel tube manufacturer, supplier and exporter based in Gujarat, India. For over a decade, our facility has produced drawn, rolled, and welded austenitic stainless tubing, reaching an annual capacity of approximately 8,000 MT.
Stainless steel 316 tube is a molybdenum-bearing austenitic tube produced to ASTM A213 / ASME SA-213 TP316 in seamless form and ASTM A249 / ASME SA-249 TP316 in welded form, with general-service material to ASTM A269. The grade carries 2.00-3.00% molybdenum alongside 16.0-18.0% chromium and 10.0-14.0% nickel. Minimum tensile strength in the annealed condition is 515 MPa (75 ksi), minimum yield is 205 MPa (30 ksi), with 35% minimum elongation. The material also answers to UNS S31600 and 1.4401 in Europe, and to SUS 316 in Japan. 316 SS seamless tubing carries no longitudinal weld, so ASME B31.3 assigns it a weld joint quality factor of 1.0 against 0.85 for SS 316 welded tubes. At the same design pressure, that puts roughly 18% more wall on the welded tube; the factor rises to 1.0 with 100% radiography. Alloy 316 welded tube costs less and has tighter wall uniformity.
We roll 316 stainless round tube from 12.7 mm to 101.6 mm outside diameter in lengths up to 24 metres, and welded square and rectangular box sections in lengths up to 12 metres. Heat exchangers, refinery circuits, marine deck hardware, pharmaceutical and dairy process runs: 316 tube serves all of them. Our plant holds ISO 14001:2015 and ISO 45001:2018 certification with IBR, EIL and PED 2014/68/EU approvals, and every consignment ships with a mill test certificate.
316 Stainless Steel Tubing Specification
We supply ASTM A213 seamless and ASTM A249 welded 316 stainless steel tubes in round, square, and rectangular profiles.
| Parameter | Value |
|---|---|
| Applicable standards | ASTM A213 / ASME SA-213 (Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes), ASTM A249 / ASME SA-249 (Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes), ASTM A269 (Seamless and Welded Austenitic Stainless Steel Tubing for General Service), ASTM A554 (Welded Stainless Steel Mechanical Tubing) |
| Manufacturing process | Seamless and welded (ERW) |
| Sections | Round, square, rectangular |
| Outside diameter, round | 12.7 mm to 101.6 mm (1/2" to 4") |
| Wall thickness, round | 1.02 mm to 3.40 mm |
| 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 tube; up to 12 metres, box sections |
| Condition | Annealed |
| Finish | Annealed and pickled as standard; bright annealed, passivated, or polished to order |
| End type | Plain end, cut to specified length |
SS 316 Tube Chemical Composition
Grade 316 stainless steel tube is a molybdenum-bearing austenitic alloy. The 2.00-3.00% molybdenum separates Type 316 from plain 18/8 chemistry, stabilising the passive film against chloride attack. 316 tubes limits for UNS S31600 are given in the table below.
| Element | Composition, % by mass |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulphur (S) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 16.0–18.0 |
| Nickel (Ni) | 10.0–14.0 |
| Molybdenum (Mo) | 2.00–3.00 |
316 Stainless Steel Tube Mechanical Properties
316 stainless steel tube to ASTM A213 / ASME SA-213, annealed, holds a minimum tensile strength of 515 MPa (75 ksi) and minimum yield of 205 MPa (30 ksi). Certified minimums appear 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 | 90 HRB / 192 HBW |
Equivalent Grades & Designations for 316 Tube
Stainless steel 316 tubing is specified across various global standards, each using distinct naming conventions. The table below outlines these equivalent cross-standard designations to assist with international sourcing, material selection, and compliance.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | UNS S31600 |
| Europe (EN / W.Nr) | 1.4401, X5CrNiMo17-12-2; high-Mo variant 1.4436, X3CrNiMo17-13-3 |
| Japan (JIS) | SUS 316; SUS316TB heat exchanger tube to JIS G 3463 |
| India (IS) | X04Cr17Ni12Mo2, IS 6911 |
| China (GB/T) | 06Cr17Ni12Mo2, formerly 0Cr17Ni12Mo2; GB/T 13296 |
| UK (BS) | BS 316S31 |
| France (AFNOR NF) | Z6CND17-11 |
| Sweden (SS) | SS 2347 |
| Russia (GOST) | 08Ch17N13M2 |
Stainless Steel 316 Tube Forms & Types
SS 316 tubing comes in seamless and welded construction, ERW included, and in round, square and rectangular sections.
02
316 Welded and ERW Tube
Welded 316 tubing is formed from a slit strip and seam-welded without filler metal. ASTM A249 requires cold working the weld before solution annealing at a minimum of 1040 °C and quenching. ERW tube follows the same route, using high-frequency resistance welding instead of a fusion arc, and costs less per metre.
03
316 Round Tube
Round section is our highest-volume 316 stainless steel round tube form, rolled from 12.7 mm to 101.6 mm OD in six gauges. Heat exchanger, instrumentation and hydraulic service all use it.
04
316 Square Tube
Our 316 stainless steel square tube is a welded box section, 12 x 12 mm to 100 x 100 mm. 316 stainless steel square tube sizes in that band go into balustrades and railings.
05
316 Rectangular Tube
Rectangular section covers 13 x 25 mm to 100 x 50 mm, wall 1.0 mm to 6.0 mm. Fabricators specify 316 stainless steel rectangular tube where a member carries a load about one axis.
316 Stainless Steel Tube Sizes
Explore our comprehensive 316 SS tube stock size options, featuring seamless and welded ERW construction from 12.7 mm to 101.6 mm OD across six wall gauges with detailed unit weights.
Welded (ERW) SS 316 tubes:
| Size | OD | 10 SWG - MM (3.25) Weight/MTR | 12 SWG - MM (2.64) Weight/MTR | 14 SWG - MM (2.03) Weight/MTR | 16 SWG - MM (1.63) Weight/MTR | 18 SWG - MM (1.22) Weight/MTR | 19 SWG - MM (1.02) 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 |
SS 316 Seamless tubes:
| Size | OD | 10 BWG - MM (3.40) Weight/MTR | 12 BWG - MM (2.77) Weight/MTR | 14 BWG - MM (2.11) Weight/MTR | 16 BWG - MM (1.65) Weight/MTR | 18 BWG - MM (1.25) Weight/MTR | 19 BWG - MM (1.07) 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 | 0.94 | 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 |
Standard and Custom Lengths
Round 316 tube leaves our plant in lengths to a maximum of 24 metres, box sections at 12 metres. Shorter drops of 6 m and 3 m are cut to the ordered length.
Surface Finish Options
Finish is set at the order stage. A213 and A249 require stainless tube 316 to leave the mill free of scale, so annealed and pickled is our standard finish; bright annealed tube goes out where pickling is not wanted. Passivated and polished 316 stainless steel tube is made to order.
Stainless Steel 316 Tube Industrial Applications
316 steel tubes serve six industry groups, covered below, each sourcing this for its unique properties.
Chemical and Petrochemical Processing
Chemical plants run 316 tube on dilute sulphuric and on phosphoric acid duty within defined concentration and temperature limits: reactor coils, dosing lines, scrubbers. Nordic buyers order it as an acid-proof SS tube.
Marine and Offshore
Marine-grade stainless is what the market calls this chemistry, and class A4 of ISO 3506 is built on the same molybdenum-bearing base. We supply 316 tube for deck rails, splash-zone hardware and topside service.
Oil and Gas
Instrumentation tubing carries hydraulic fluid and injection chemicals at pressures worked out from wall thickness, diameter and the allowable stress of the grade at design temperature. SS 316 instrumentation tube to ASTM A269 suits impulse lines and umbilicals.
Heat Exchangers, Condensers and Boilers
Shell-and-tube exchangers and surface condensers take 316 tube on the tube side, to ASTM A213 or A249.
Food, Beverage and Pharmaceutical Processing
Dairy, brewing and pharmaceutical plants use 316 tube on product-contact runs because the surface tolerates clean-in-place cycles with caustic and acid detergents. Chlorinated sanitiser residue is where standard grades pit easily, while 316 holds.
Power Generation and Pulp & Paper
316 tubing suits condensers and feedwater heaters (ASTM A688) under controlled water chemistry. Austenitic grades require case-by-case review due to stress corrosion cracking risks in hot, stressed, chloride-bearing water. The same review applies in pulp and paper service, where chloride and caustic exposure at temperature can drive stress corrosion cracking in austenitic grades.
Stainless Steel 316 Tube Shipping and Packaging
As leading 316 stainless tube suppliers, our shipping and packaging guidelines ensure secure transport, custom specifications, and full quality compliance for every order.
- Round tube ships in lengths to a maximum of 24 metres, box sections to 12 metres.
- Export consignments move through the port on FOB or CFR terms.
- We ship SS 316 tube to Brazil, Vietnam and Turkey, and hold Star Export House status.
- Every lot is released against a mill test certificate with the heat number.
Stainless Steel 316 Tube Price
316 stainless steel tube price is quoted around ₹300–₹550/kg in India (approximately US$3.13–$5.75/kg) and tracks nickel and molybdenum input costs, so we quote the day's rate rather than publish a list that goes stale within a week. Seven variables move the final figure: outside diameter, wall thickness, length, order quantity, finish, form and specification. Export orders are priced FOB or CFR.
Why Choose Moonlight Tube Industries for 316 SS tube?
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.
Quality Certification
01
IBR & EIL Approved
02
Why
Choose Us
03
Wide Range of Grades & Sizes
04
Timely Global Delivery
Frequently Asked Questions About 316 SS Tube
316 stainless steel tube contains 2.00–3.00% molybdenum; 304 contains none. That molybdenum gives alloy 316 tubes higher resistance to pitting and crevice corrosion in chlorides.
Specify 316L for welded assemblies in corrosive service: its 0.035% carbon ceiling suppresses weld-zone sensitisation. Choose 316 for the higher 205 MPa yield.
Yes, and molybdenum is the reason. It isn't immune, though: under tensile stress in hot chloride solution, alloy 316 tube can fail by stress corrosion cracking.
SS 316 tubing costs around ₹300–₹550/kg in India (approximately US$3.13–$5.75/kg). Cost varies based on the current nickel and molybdenum rates. Diameter, wall, length, quantity, finish and construction all move it.
Yes. We make square box sections from 12 x 12 mm to 100 x 100 mm and rectangular 13 x 25 mm to 100 x 50 mm, to ASTM A554.