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Stainless Steel Welded Tubes
Stainless steel welded tubes are produced by cold-forming a flat-rolled steel into a cylindrical shape and permanently welding the longitudinal edges by passing high-frequency electric resistance. This welding technique gives a high strength bond that is virtually seamless and creates high structural integrity of the tubes. These tubes are characterised by a uniform wall thickness with a high degree of dimensional precision resulting in reliable corrosion resistance and a smooth internal finish and make them an economical yet dependable option in a broad selection of industrial and mechanical applications.
ASTM A249 Stainless Steel Welded Tubes Manufacturer, Supplier & Exporter in India
Stainless Steel Welded Tubes is a vital part of the modern industrial structure, and it is a balance point of strength, resistance to corrosion, dimensional accuracy, and cost-effectiveness. These tubes are developed by bending stainless steel strips or coils into tubes and welding the longitudinal seam with controlled welding techniques like ERW (Electric Resistance Welding) or TIG (Tungsten Inert Gas) welding.
At Solitaire Overseas, we specialize in supplying and exporting high-quality stainless steel welded tubes that meet international standards and stringent quality requirements. Our welded tubes are used across chemical processing, oil & gas, power generation, pharmaceutical, food processing, water treatment, and structural applications worldwide.
Welded stainless steel tubes are used in situations whereby homogenous wall thickness, finish on the surface and dependability are needed. The controlled manufacturing process ensures consistency in mechanical properties and geometry, making welded tubes suitable for a wide range of industrial and commercial uses.
Why Choose Welded Over Seamless Tubes?
While seamless tubes are often used for high-pressure extremes, welded tubes provide distinct technical and logistical benefits:
- Better Dimensional Control: Offers superior control over outside diameter (OD) and wall thickness consistency.
- Extended Lengths: Available in longer continuous lengths, reducing the need for field joints and fittings.
- Cost-Efficiency: Significantly more economical for large-volume requirements and structural projects.
- Surface Excellence: Provides a high-quality surface finish, making them ideal for hygienic (food/pharma) and aesthetic applications.
The above advantages have made stainless steel weld tube a favorite of non-critical to medium pressure systems and structural application. Our products are also tested to ASTM A249 specification, which makes sure that the products are specifically tested to be used in boilers, superheaters, heat exchangers and also in condenser tubes.
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Table of Contents
- Grades of Stainless Steel Welded Tubes
- Stainless Steel Welded Tubes Specifications
- Standards & International Compliance of Welded Tubes
- Chemical Composition of Stainless Steel Welded Tubes
- Mechanical Properties Of SS Welded Tubes
- Stainless Steel Welded Tubes Dimension
- SS Welded Tubes Manufacturing Process – Step-by-Step
- Heat Treatment & Finishing of Stainless Steel Welded Tubes
- Stainless Steel Seamless Tube Sizes
- Types Of Stainless Steel Seamless Tubes
- Applications of Stainless Steel Welded Tubes
- Related Products
- Frequently Asked Questions
Grades of Stainless Steel Welded Tubes
We supply welded tubes in a comprehensive range of stainless steel grades to suit different service conditions:
Austenitic Grades
- SS 304 / 304L – Excellent corrosion resistance and formability
- SS 316 / 316L – Enhanced resistance to chlorides and chemicals
- SS 321 – Stabilized for high-temperature service
- SS 310 / 310S – Excellent oxidation resistance at elevated temperatures
- SS 347 / 347H – Suitable for pressure and heat exchanger applications
Other grades can be supplied as per customer specifications.
Stainless Steel Welded Tubes Specifications
Our Stainless Steel welded tubes are engineered to meet precise dimensional standards, offering a versatile range of diameters and thicknesses for various industrial fluid systems.
| Specification | Details |
|---|---|
| Product Type | Welded Stainless Steel Pipes & Tubes |
| Standards | ASME/ASTM A249, A269, A312, EN 10217-7 (Equivalent to EN & DIN Standards) |
| Outer Diameter (O.D) | 21.3 mm to 219.1 mm |
| Nominal Bore (N.B) | 1/2″ NB to 8″ NB |
| Wall Thickness | 0.90 mm to 8 mm (SCH 5S, SCH 10S, SCH 20, SCH 40S) |
| Length | Up to 6 meters |
| Process Features | Gas Annealed, Pickled & Passivated |
| Surface Finish | Pickled, 2B |
| Material Grades | 304, 304L, 316, 316L Stainless Steel |
Standards & International Compliance of Welded Tubes
We manufacture our products in strict adherence to global certification standards to ensure safe operation in high-pressure and thermal applications.
ASTM / ASME Standards
- ASTM A249 / ASME SA249 – Welded tubes for boilers, heat exchangers, and condensers
- ASTM A269 / ASME SA269 – Welded tubes for general service
- ASTM A312 / ASME SA312 – Welded stainless steel pipes and tubes
European & Other Standards
- EN 10217-7 – Welded steel tubes for pressure purposes
- DIN / ISO / Equivalent EN Standards – Available on request
Chemical Composition of Stainless Steel Welded Tubes
The following chemical breakdown illustrates the alloying elements that provide our tubes with exceptional resistance to oxidation and chemical corrosion.
| Grade | DIN (EN) | % C(Max) | % Mn Max | % P (Max) | % S (Max) | % SI(Max) | % CR | % Ni | % Mo | % N Max | % CU Max | % OTHERS | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Austenitic | 304 | 1.4301 | 0.080 | 2.00 | 0.045 | 0.030 | 0.75 | 18.00-20.00 | 8.00-10.50 | 0.10 | |||
| 304H | 1.4948 | 0.04-0.10 | 2.00 | 0.045 | 0.030 | 0.75 | 18.00-20.00 | 8.00-10.50 | – | ||||
| 304L | 1.4307 | 0.030 | 2.00 | 0.045 | 0.030 | 0.75 | 18.00-20.00 | 8.00-12.00 | – | 0.10 | – | ||
| 304LN | 1.4311 | 0.030 | 2.00 | 0.045 | 0.030 | 0.75 | 18.00-20.00 | 8.00-12.00 | – | 0.10-0.16 | – | ||
| 309 | 1.4828 | 0.20 | 2.00 | 0.045 | 0.030 | 0.75 | 22.00-24.00 | 12.00-15.00 | – | ||||
| 309S | 0.08 | 2.00 | 0.045 | 0.030 | 0.75 | 22.00-24.00 | 12.00-15.00 | – | |||||
| 310 | 1.4841 | 0.025 | 2.00 | 0.045 | 0.030 | 1.50 | 24.00-26.00 | 19.00-22.00 | – | ||||
| 310S | 1.4845 | 0.08 | 2.00 | 0.045 | 0.030 | 1.50 | 24.00-26.00 | 19.00-22.00 | – | ||||
| 316 | 1.4401 | 0.08 | 2.00 | 0.045 | 0.030 | 0.75 | 16.00-18.00 | 10.00-14.00 | 2.00-3.00 | 0.10 | – | – | |
| 316L | 1.4404 | 0.030 | 2.00 | 0.045 | 0.030 | 0.75 | 16.00-18.00 | 10.00-14.00 | 2.00-3.00 | 0.10 | |||
| 316LN | 0.030 | 2.00 | 0.045 | 0.030 | 0.75 | 16.00-18.00 | 10.00-14.00 | 2.00-3.00 | 0.10-0.16 | – | – | ||
| 316Ti | 1.4571 | 0.08 | 2.00 | 0.045 | 0.030 | 0.75 | 16.00-18.00 | 10.00-14.00 | 2.00-3.00 | 0.10 | – | Ti = 5X (C+N) Min., 0.70 Max. | |
| 317 | 1.4449 | 0.08 | 2.00 | 0.045 | 0.030 | 0.75 | 18.00-20.00 | 11.00-15.00 | 3.00-4.00 | 0.10 | – | – | |
| 317L | 1.4438 | 0.030 | 2.00 | 0.045 | 0.030 | 0.75 | 18.00-20.00 | 11.00-15.00 | 3.00-4.00 | 0.10 | |||
| 317LN | 0.030 | 2.00 | 0.045 | 0.030 | 0.75 | 18.00-20.00 | 11.00-15.00 | 3.00-4.00 | 0.10-0.22 | – | |||
| 321 | 1.4541 | 0.08 | 2.00 | 0.045 | 0.030 | 0.75 | 17.00-19.00 | 9.00-12.00 | 0.10 | – | Ti = 5X (C+N) Min., 0.70 Max. | ||
| 347 | 1.4550 | 0.08 | 2.00 | 0.045 | 0.030 | 0.75 | 17.00-19.00 | 9.00-13.00 | – | – | Cb = 10XC Min.,1.00 Max. |
Mechanical Properties Of SS Welded Tubes
This data outlines the structural integrity of our tubes, including their ability to withstand tensile stress and maintain elasticity under load
| Grade | Tensile Strength (MPa) | Yield Strength 0.2% (MPa) | Elongation (%) | Hardness (HRB Max) | Elasticity (GPa) | Typical Applications |
|---|---|---|---|---|---|---|
| 304 | 515–750 | ≥205 | ≥40 | 90 | 193 | Piping, tanks, furniture |
| 304L | 485–700 | ≥170 | ≥40 | 90 | 193 | Welded systems, vessels |
| 304H | ≥515 | ≥205 | ≥40 | 92 | 193 | Boilers, high-temp use |
| 316 | 515–760 | ≥205 | ≥40 | 95 | 193 | Marine, chemical, pharma |
| 316L | 485–700 | ≥170 | ≥40 | 95 | 193 | Heat exchangers, pipelines |
| 316Ti | ≥515 | ≥205 | ≥40 | 95 | 193 | High-temp piping, food industry |
| 317L | ≥515 | ≥205 | ≥35 | 95 | 193 | Chemical tanks, plants |
| 321 | ≥515 | ≥205 | ≥40 | 95 | 193 | Aerospace, high-heat service |
| 347 | ≥515 | ≥205 | ≥40 | 95 | 193 | Welded high-temp structures |
Stainless Steel Welded Tubes Dimension
Refer to this below chart to calculate the theoretical weight per meter based on specific outside diameter and wall thickness requirements.
| Wall thickness in mm. | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.2 | 1.6 | 2 | 2.6 | 3 | 3.2 | 3.6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| O.D. in mm. | Weight in kg/meter | |||||||||||
| 6 | 0.069 | 0.081 | 0.093 | 0.104 | 0.125 | 0.144 | 0.176 | – | – | – | – | – |
| 9.52 | 0.112 | 0.134 | 0.154 | 0.174 | 0.213 | 0.249 | 0.317 | – | – | – | – | – |
| 10 | 0.119 | 0.141 | 0.163 | 0.184 | 0.225 | 0.264 | 0.336 | – | – | – | – | – |
| 12.7 | 0.153 | 0.182 | 0.21 | 0.238 | 0.293 | 0.345 | 0.444 | – | – | – | – | – |
| 14 | 0.169 | 0.201 | 0.233 | 0.264 | 0.325 | 0.384 | 0.496 | – | – | – | – | – |
| 15.87 | 0.192 | 0.229 | 0.266 | 0.301 | 0.372 | 0.44 | 0.571 | 0.694 | – | – | – | – |
| 19 | 0.231 | 0.276 | 0.32 | 0.364 | 0.45 | 0.534 | 0.696 | 0.85 | 1.066 | 1.2 | 1.264 | – |
| 25 | 0.306 | 0.366 | 0.425 | 0.484 | 0.6 | 0.714 | 0.936 | 1.15 | 1.456 | 1.65 | 1.744 | 1.926 |
| 25.4 | 0.311 | 0.372 | 0.432 | 0.492 | 0.61 | 0.726 | 0.952 | 1.17 | 1.482 | 1.68 | 1.776 | 1.962 |
| 31.8 | – | – | – | – | – | 0.918 | 1.208 | 1.49 | 1.898 | 2.16 | 2.288 | 2.538 |
| 38 | – | – | – | – | – | 1.104 | 1.456 | 1.8 | 2.301 | 2.625 | 2.784 | 3.096 |
| 44.5 | – | – | – | – | – | 1.299 | 1.716 | 2.125 | 2.724 | 3.113 | 3.304 | 3.681 |
| 50.8 | – | – | – | – | – | 1.488 | 1.968 | 2.44 | 3.133 | 3.585 | 3.808 | 4.248 |
| 63.5 | – | – | – | – | – | – | 2.476 | 3.075 | 3.959 | 4.538 | 4.824 | 5.391 |
| 76.1 | – | – | – | – | – | – | 2.98 | 3.705 | 4.778 | 5.483 | 5.832 | 6.525 |
| 101.6 | – | – | – | – | – | – | 4 | 4.98 | 6 | 7 | 7,872 | 8.82 |
SS Welded Tubes Manufacturing Process – Step-by-Step
The quality of stainless steel welded tubes depends heavily on the manufacturing process. At Solitaire Overseas, tubes are sourced from ISO-certified facilities following strict production controls.
1. Raw Material Selection
High-quality stainless steel coils are selected based on chemical composition, mechanical properties, and surface condition.
2. Forming Process
The stainless steel strip is gradually formed into a round tube using precision forming rollers.
3. Welding
Edges are welded using:
- Electric Resistance Welding (ERW) for high productivity
- TIG Welding for applications requiring superior weld quality
4. Weld Bead Treatment
Internal and external weld beads are scarfed to achieve a smooth internal bore and uniform outer surface.
5. Heat Treatment
Solution annealing is performed to restore corrosion resistance and eliminate residual stresses.
6. Pickling & Passivation
Chemical treatment removes surface contaminants and improves corrosion resistance.
7. Sizing & Straightening
Ensures tight dimensional tolerances and straightness.
8. Final Inspection
Each tube undergoes inspection before approval for dispatch.
Heat Treatment & Finishing of Stainless Steel Welded Tubes
Heat treatment and finishing improve the strength and surface quality of welded tubes to meet ASTM A249 and A269 standards.
- Solution Annealing: Tubes are heated to 1,040–1,120°C and quickly cooled. This relieves welding stress and restores a uniform, corrosion-resistant structure in grades like 304H, 316L, and 321.
- Cleaning & Passivation: Tubes undergo pickling to remove impurities, followed by passivation to create a protective, rust-resistant layer.
- Surface Finishing: Depending on the industry (such as food, dairy, or pharma), tubes are finished with a 2B matte, bright annealed, or polished (180–320 grit) surface.
Stainless Steel Seamless Tube Sizes
Our comprehensive size range covers various outside diameters and wall thicknesses to provide precision-engineered solutions for diverse industrial tubing requirements.
| Wall Thickness (inches) | SS Seamless Tube Sizes (O.D.) |
|---|---|
| .010 | 1/16", 1/8", 3/16" |
| .020 | 1/16", 1/8", 3/16", 1/4", 5/16", 3/8" |
| .028 | 1/8", 3/16", 1/4", 5/16", 3/8", 1/2", 3/4", 1", 1 1/2", 2" |
| .035 | 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", 3/4", 7/8", 1", 1 1/4", 1 1/2", 1 5/8", 2", 2 1/4" |
| .049 | 3/16", 1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1 1/8", 1 1/4", 1 1/2", 1 5/8", 2", 2 1/4" |
| .065 | 1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1 1/4", 1 1/2", 1 5/8", 1 3/4", 2", 2 1/2", 3" |
| .083 | 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1 1/4", 1 1/2", 1 5/8", 1 7/8", 2", 2 1/2", 3" |
| .095 | 1/2", 5/8", 1", 1 1/4", 1 1/2", 2" |
Types Of Stainless Steel Seamless Tubes
Stainless Steel Seamless Pipe 904l /015cr21ni26mo5cu2/1.4539 inch mm sizes customized
AISI 316 316l 304 seamless stainless steel pipe
Stainless steel pipes seamless SIZE 4" tube 12M long PIPE
sch80 316L 304l stainless steel seamless tube steel pipe
ASTM a423 a1 seamless steel pipe Boiler air heater tube
4 inch ss 316 stainless steel seamless pipes tube
304 Large diameter stainless steel seamless pipe 10 inch
1/2" 304 Bright Annealed Seamless Stainless Steel Pipe
Custom Size 3 Inch Stainless Seamless 4 Sch 40 Steel Pipe
ASTM A213 AISI304 304L 304H Stainless Steel Seamless Heat Exchanger Tubes size 19.05x2.77x4454mm
Customized size seamless stainless steel pipe a312 gr tp304l
stainless steel seamless ss304 pipe sizes for exhaust
Applications of Stainless Steel Welded Tubes
Stainless steel welded tubes are widely used across industries due to their strength, corrosion resistance, and compliance with standards like ASTM A249, A269, and ASME SA249.
- Heat Exchangers
- IndustryChemical & Petrochemical
- Oil and Gas ProductionGas Industry
- Energy IndustryPower Generation
- Pressure VesselsPressure Vessels
- Marine EquipmentsMarine Equipments
- Food & Beverage ProcessingFood & Beverage Processing
- Auto IndustryAutomotive
- Pulp & PaperPulp & Paper
Quality Control & Testing of Stainless Steel Welded Tubing
Each batch of stainless steel welded tubes is subjected to strict quality checks:
- Chemical composition analysis
- Mechanical testing (tensile, hardness, flattening)
- Eddy current or hydrostatic testing
- Dimensional and visual inspection
- Surface finish inspection
All tubes are supplied with EN 10204 3.1 Mill Test Certificates, ensuring traceability and compliance.
Request a Quote for Stainless Steel Welded Tubes?
Need reliable and certified Stainless Steel Welded Tubes? for your next project? At Solitaire Overseas, we offer custom sizes, quick delivery, and global shipping. Request a quote tailored to your specifications and industry standards.
Get a Fast Quote Now!Frequently Asked Questions
Welded tubes are made by rolling and welding a strip of stainless steel, while seamless tubes are extruded from solid billets. Seamless tubes offer better pressure resistance but welded tubes are more cost-effective and available in larger diameters.
They are widely used in heat exchangers, boilers, power plants, petrochemical plants, and marine applications due to their corrosion resistance and mechanical strength.
No, ASTM A249 is specifically for heat exchanger and condenser tubes, while A269 covers general-purpose instrumentation tubing. Both are for welded stainless steel tubes.
Yes, grades like 304H and 316H are suitable for high-temperature applications when properly heat treated.
Common finishes include pickled, annealed, polished (180 to 600 grit), and bright annealed (BA) for aesthetic or hygienic use.
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