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304L Seamless Tube
Seamless 304L stainless steel tubing starts as a pierced hollow and finishes cold drawn, so no longitudinal weld runs through the wall. ASTM A213 / ASME SA-213 governs the route and names heat-exchanger duty in its title.
Stainless Steel 304L Tube Manufacturer in India
MLTI Private Limited (Moonlight Tube Industries) has been a reliable 304L stainless steel tube manufacturer, supplier and exporter in Gujarat, India, since 2008. We have an annual capacity of roughly 8,000 MT a year. Stainless steel 304L tube is the low-carbon member of the 18/8 austenitic family, registered as UNS S30403 on the ordering specification. Carbon is held to 0.035% maximum under ASTM A213 / ASME SA-213 and to 0.030% maximum under ASTM A249 / ASME SA-249. That ceiling keeps chromium in solid solution through a weld thermal cycle. Chromium runs 18.0 to 20.0% and nickel 8.0 to 12.0%.
Certified minima in the solution-treated condition are 485 MPa (70 ksi) tensile strength, 170 MPa (25 ksi) yield strength and 35% elongation, with hardness capped at 90 HRB. Continental documents name the same material 1.4306 and Japanese ones SUS 304L. We draw seamless 304L tubes, pierced from a solid billet and finished without a longitudinal weld to handle high pressure, to ASTM A213 / ASME SA-213. We also produce welded TP304L tubes, which are formed from flat strips and seam-fused for tighter tolerances, to ASTM A249 / ASME SA-249. Round tube spans 12.7 mm to 101.6 mm outside diameter on walls of 0.71 mm to 3.2 mm, cut to length in house. Chemical circuits and dairy runs take most of this output. Our company holds ISO 14001 and 45001 certifications with BIS, EIL, IBR, PED 2014/68/EU and AD 2000-Merkblatt W0 approval. Every consignment ships against a mill test certificate.
Stainless Steel 304L Tube Specifications
The following table outlines stainless steel 304L tube specifications, including dimensions, delivery conditions, and governing ASTM/ASME designations.
| Parameter | Value |
|---|---|
| Applicable standards | ASTM A213/ ASME SA-213: Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes ASTM A249/ ASME SA-249: 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 route | Seamless, and welded (ERW) |
| Section | Round, square, rectangular |
| Outside diameter, round | 12.7 mm to 101.6 mm (1/2" to 4") |
| Wall thickness, round | 1.02 mm to 3.25 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 | To 24 metres round; to 12 metres box section; cut to order |
| Delivery condition | Solution treated at 1040 °C minimum, rapid cooled |
| Finish | Mill finish; pickled and passivated; polished to order |
SS 304L Tube Chemical Composition
Carbon is the line of the analysis that separates UNS S30403 from the base 18/8 chemistry, and ASTM A213 also carries the nickel band a point higher, at 8.0 to 12.0% against 8.0 to 11.0% for SS 304.
| Element | Composition, % by mass |
|---|---|
| Carbon (C) | 0.035 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulphur (S) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 12.0 |
| Iron (Fe) | Balance |
304L Stainless Steel Tube Mechanical Properties
Three certified minima and one hardness maximum govern acceptance of 304L SS tubes, and every heat is tested against them before release. Values applying to ASME SA-213 TP304L appear in the table below.
| Property | Value |
|---|---|
| Tensile strength, min | 485MPa (70ksi) |
| Yield strength, 0.2% offset, min | 170MPa (25ksi) |
| Elongation in 50 mm, min | 35% |
| Hardness, max | 90 HRB (192 HBW / 200 HV) |
304L Tube Equivalent Grades and Designations
The international designations equivalent to AISI 304L Tube are listed below in the table along with their designations and standards.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | UNS S30403 |
| Europe (EN / W.Nr) | 1.4306, X2CrNi19-11 |
| Japan (JIS) | SUS 304L, SUS 304LTB |
| India (IS) | X02Cr19Ni10 |
| China (GB) | 022Cr19Ni10 |
| UK (BS) | 304S11 |
| France (AFNOR) | Z2CN18-10 |
| Sweden (SS) | 2352 |
304L SS Tube Forms and Types
SS 304L tube is supplied in two construction routes and three sections: seamless to ASTM A213/ASME SA-213, welded and ERW to ASTM A249/ASME SA-249, in round, square and rectangular profiles.
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304L Welded and ERW Tube
Slit strip is the starting stock for welded construction, joined by electric resistance welding and solution treated to ASTM A249 / ASME SA-249. ERW 304L tube costs less per metre than drawn material, and a cold-redrawn pass tightens the dimensions.
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304L Round Tube
Round is the highest-volume profile, rolled across eleven diameters between 12.7 mm and 101.6 mm. Instrumentation and exchanger runs both draw on stainless steel 304L tube.
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304L Square Tube
Square box section runs 12 x 12 mm through 100 x 100 mm on walls of 1.0 mm to 6.0 mm, welded to ASTM A554. Handrails and equipment frames take 304L square tube.
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304L Rectangular Tube
Rectangular section covers 13 x 25 mm to 100 x 50 mm at the same wall range, in lengths to 12 metres. Fabricators specify 304L rectangular tube for members that carry load about one axis.
Stainless Steel 304L Tube Sizes
The SS 304L tube size chart lists common tube diameters with different BWG wall thicknesses and corresponding weights per metre.
304L Seamless Tube Size Chart
| 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 |
304L ERW Tube Size Chart
| 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 |
304L Tube Stainless Steel Industrial Applications
Six sectors take most of the stainless steel 304L tubes, with the equipment each one specifies named below.
Chemical Processing
Acid service is where UNS S30403 tube earns its place: dilute nitric, phosphoric and organic duty. Welded reactor coils and dosing lines are its usual positions, and the assembly goes into service unannealed.
Food, Beverage and Dairy
Milk transfer lines and brewery circuits are built from 304L tube because the wall tolerates repeated clean-in-place cycles with caustic and acid detergents.
Pulp and Paper
Stock preparation lines, white water headers and vacuum piping run 304L tube on the non-bleach side of the mill. Long site-welded runs hold up because the low carbon keeps sensitisation in check.
Heat Exchangers and Condensers
Shell-and-tube exchangers take 304L tube on the tube side to ASTM A213 or ASTM A249. Thin walls move heat efficiently, and the metal survives tubesheet welding.
Power Generation
Feedwater heaters, auxiliary cooling circuits and condenser air-removal lines run 304L tube below the creep range. Plant builders favour it where welded attachments are numerous.
Water and Wastewater Treatment
Aeration headers and sludge handling circuits use 304L stainless steel tubes against mildly aggressive process water. Site-welded joints hold up without heat treatment.
Welding and Corrosion Behaviour of 304L Tube
Chromium carbide precipitation at the grain boundaries is what a welder risks in an unstabilised 18/8 analysis. Carbide forms in the 425 °C to 815 °C band. The chromium-depleted metal beside it then corrodes intergranularly, and carbon that isn't present cannot feed that reaction. ASTM A213 / ASME SA-213 requires only solution treatment at 1040 °C minimum followed by rapid cooling for SS 304L; no stress-relieved or subcritical annealed condition is specified for the grade.
Stainless Steel 304L Tube Shipping and Packaging
The shipping and packaging of ASTM A213 TP304L tubes have been given below.
- Round tube ships in lengths to 24 metres, box section to 12 metres.
- Bundles carry end caps and strapping, stencilled for grade and heat number.
- Export cargo leaves from the port on FOB or CFR terms under Star Export House status.
- Brazil, Turkey and Vietnam take regular shipments.
SS 304L Tube Price
Stainless steel 304L tube price in India ranges from ₹250 – ₹320 per kg and $3.00 – $3.90. Nickel input costs move week to week. Seven variables set it: outside diameter, wall gauge, section, route, length, finish and quantity.
Why Buy Stainless Steel 304L Tube From MLTI?
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
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IBR & EIL Approved
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Why
Choose Us
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Wide Range of Grades & Sizes
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Timely Global Delivery
Frequently Asked Questions About TP 304L Tube
Seamless 304L tube ships to ASTM A213 / ASME SA-213 and welded tube to ASTM A249 / ASME SA-249. General-service SS 304L tube follows ASTM A269.
Round 304L tubing runs 12.7 mm to 101.6 mm outside diameter, on walls of 1.02 mm to 3.25 mm.
Carbon content separates the two grades. ASTM A213 permits 0.08% carbon in SS 304 against 0.035% in SS 304L, so 304L resists intergranular attack after welding. 304 in return certifies to 515 MPa tensile.
Both routes are in production here. Seamless tube is drawn to ASTM A213, and welded or ERW 304L tubing is rolled to ASTM A249.
Wall tolerance is set by the ordering specification. Tube ordered on minimum wall runs over nominal and never under (+20 %/−0 for cold-finished seamless up to 38.1 mm outside diameter, +22 %/−0 above that, and +18 %/−0 for welded tube) while tube ordered on average wall is held to ±10 %.
A post-weld solution anneal is not required in most service. The 0.035% carbon ceiling suppresses carbide precipitation, so the heat-affected zone doesn't sensitise.
Square and rectangular 304L tubes are supplied to ASTM A554, from 12 x 12 mm square up to 100 x 50 mm rectangular.
Price ranges from ₹250 – ₹320 per kg and $3.00 – $3.90 per kilogram against the day's nickel rate rather than as a fixed list. Diameter and wall gauge move it most.
Sustained service is normally held to 425 °C, above which the low-carbon analysis carries less creep strength and a stabilised grade is specified.