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Girgaon, Mumbai - 400004
Stainless Steel Welded Tubes Manufacturer in India
Stainless Steel Welded Tubes are tubular products manufactured by forming stainless steel strip or sheet into a cylindrical shape and joining the edges through a controlled welding process. They offer a combination of corrosion resistance, strength, durability, clean surface finish and dimensional consistency, making them suitable for a wide range of industrial and commercial applications.
Stainless Steel Welded Tubes are available in various grades, including Stainless Steel 304, 304L, 316, 316L, 321, 347, 904L and other alloy grades, depending on the required corrosion resistance, mechanical properties and operating conditions.
These tubes are widely used in chemical processing, oil and gas, petrochemical, pharmaceutical, food processing, power generation, heat exchangers, water treatment and general engineering applications. They can be supplied in different outside diameters, wall thicknesses, schedules, lengths and finishes according to project requirements.
Kamal Steels is a reliable Stainless Steel Welded Tubes Manufacturer and Stockist in India, supplying welded tubes in different grades, sizes, wall thicknesses and lengths. We cater to domestic and international requirements with suitable material test certificates, inspection documentation and export packaging.
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Stainless Steel Welded Tube Specifications
| Product | Stainless Steel Welded Tubes |
|---|---|
| Brand | Kamal Steels |
| Material | Stainless Steel |
| Manufacturing Process | Electric Resistance Welded (ERW), TIG Welded, Laser Welded |
| Available Grades | 304, 304L, 316, 316L, 321, 347, 310S, 904L |
| Outside Diameter (OD) | 6.00 mm to 219.10 mm |
| Wall Thickness | 0.5 mm to 12.7 mm |
| Length | 6 Meter, Single Random, Double Random, Cut Length |
| Tube Ends | Plain End, Beveled End |
| Surface Finish | Mill Finish, Annealed & Pickled (AP), Bright Annealed (BA), Polished |
| Standards | ASTM A269, ASME SA269 |
| Testing | PMI, Hydrostatic, Eddy Current, Flattening, Flaring & Third-Party Inspection |
| Applications | Instrumentation, process piping, food processing, pharmaceutical, chemical, water treatment, general engineering |
Stainless Steel Welded Tube Size Chart
The following chart shows the standard outside diameter (OD) sizes available for stainless steel welded tubes manufactured in accordance with ASTM A249, ASTM A269 and ASTM A554 specifications.
| NPS (Inch) | OD (mm) | SCH 5S (kg/m) | SCH 10S (kg/m) | SCH 40S (kg/m) | SCH 80S (kg/m) |
|---|---|---|---|---|---|
| 1/8" | 10.3 | 0.24 | 0.24 | 0.32 | 0.43 |
| 1/4" | 13.7 | 0.33 | 0.44 | 0.58 | 0.77 |
| 3/8" | 17.1 | 0.42 | 0.55 | 0.76 | 1.03 |
| 1/2" | 21.3 | 0.64 | 0.81 | 1.27 | 1.69 |
| 3/4" | 26.7 | 0.81 | 1.03 | 1.69 | 2.25 |
| 1" | 33.4 | 1.31 | 2.11 | 2.50 | 3.24 |
| 1 1/4" | 42.2 | 1.68 | 2.69 | 3.56 | 4.72 |
| 1 1/2" | 48.3 | 1.93 | 3.09 | 4.05 | 5.56 |
| 2" | 60.3 | 2.42 | 4.05 | 5.44 | 7.48 |
| 2 1/2" | 73.0 | 3.67 | 5.25 | 8.63 | 11.43 |
| 3" | 88.9 | 4.49 | 6.49 | 11.29 | 15.27 |
| 3 1/2" | 101.6 | 5.17 | 7.48 | 13.57 | 18.72 |
| 4" | 114.3 | 5.84 | 8.46 | 16.07 | 22.32 |
| 5" | 141.3 | 9.18 | 11.19 | 21.77 | 31.06 |
| 6" | 168.3 | 10.94 | 13.43 | 28.26 | 42.56 |
| 8" | 219.1 | 14.37 | 19.46 | 42.55 | 63.49 |
Weight Chart of SS 304 Welded Tubes
Approximate weight per metre (kg/m) of SS 304 welded tubes by BWG wall thickness, using a density of 7.93 g/cm³. Values are for reference and may vary with tolerances.
| OD (Inch) | OD (mm) | BWG 20 (0.89 mm) | BWG 18 (1.24 mm) | BWG 16 (1.65 mm) | BWG 14 (2.11 mm) | BWG 12 (2.77 mm) |
|---|---|---|---|---|---|---|
| 1/4" | 6.35 | 0.12 | 0.16 | — | — | — |
| 3/8" | 9.53 | 0.19 | 0.26 | 0.32 | — | — |
| 1/2" | 12.70 | 0.26 | 0.35 | 0.45 | 0.56 | — |
| 5/8" | 15.88 | 0.33 | 0.45 | 0.58 | 0.72 | 0.90 |
| 3/4" | 19.05 | 0.40 | 0.55 | 0.72 | 0.89 | 1.12 |
| 1" | 25.40 | 0.54 | 0.75 | 0.98 | 1.22 | 1.56 |
| 1 1/4" | 31.75 | 0.68 | 0.94 | 1.24 | 1.56 | 2.00 |
| 1 1/2" | 38.10 | 0.83 | 1.14 | 1.50 | 1.89 | 2.44 |
| 2" | 50.80 | 1.11 | 1.53 | 2.02 | 2.56 | 3.31 |
| 2 1/2" | 63.50 | 1.39 | 1.92 | 2.54 | 3.23 | 4.19 |
| 3" | 76.20 | 1.67 | 2.32 | 3.06 | 3.89 | 5.07 |
| 4" | 101.60 | 2.23 | 3.10 | 4.11 | 5.23 | 6.82 |
Weight (kg/m) = (OD − WT) × WT × 0.02491, with OD and WT in mm. For 316 / 316L add about 1.5%. A dash means the combination is not usually supplied.
316L Tube Wall Thickness Chart
| Tube OD (mm) | 0.5 mm | 0.8 mm | 1.0 mm | 1.2 mm | 1.5 mm | 2.0 mm | 3.0 mm |
|---|---|---|---|---|---|---|---|
| 12.70 | ✓ | ✓ | ✓ | ✓ | ✓ | - | - |
| 19.05 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | - |
| 25.40 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| 38.10 | - | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| 50.80 | - | - | ✓ | ✓ | ✓ | ✓ | ✓ |
| 63.50 | - | - | - | ✓ | ✓ | ✓ | ✓ |
| 76.20 | - | - | - | ✓ | ✓ | ✓ | ✓ |
| 101.60 | - | - | - | - | ✓ | ✓ | ✓ |
Note: The check marks indicate listed size and thickness combinations. Actual availability and dimensional tolerances should be confirmed against the required specification.
Stainless Steel Welded Tube Dimensions Chart
| Tube Size (Inch) | Outside Diameter (OD) mm | Wall Thickness Range (mm) | Standard Length |
|---|---|---|---|
| 1/8" | 6.35 | 0.5 – 1.2 | 6 m / Cut Length |
| 1/4" | 9.53 | 0.5 – 1.5 | 6 m / Cut Length |
| 3/8" | 12.70 | 0.5 – 2.0 | 6 m / Cut Length |
| 1/2" | 15.88 | 0.5 – 2.0 | 6 m / Cut Length |
| 3/4" | 22.23 | 0.8 – 2.5 | 6 m / Cut Length |
| 1" | 25.40 | 1.0 – 3.0 | 6 m / Cut Length |
| 1 1/4" | 31.75 | 1.2 – 3.0 | 6 m / Cut Length |
| 1 1/2" | 38.10 | 1.2 – 3.0 | 6 m / Cut Length |
| 2" | 50.80 | 1.5 – 4.0 | 6 m / Cut Length |
| 2 1/2" | 63.50 | 2.0 – 4.0 | 6 m / Cut Length |
| 3" | 76.20 | 2.0 – 4.0 | 6 m / Cut Length |
| 4" | 101.60 | 2.0 – 6.0 | 6 m / Cut Length |
Chemical Composition of Chemical Composition of Welded Tubes
| Grade | C | Mn | Si | Cr | Ni | Mo |
|---|---|---|---|---|---|---|
| 304 | 0.08 | 2.00 | 0.75 | 18.0-20.0 | 8.0-10.5 | - |
| 304L | 0.03 | 2.00 | 0.75 | 18.0-20.0 | 8.0-12.0 | - |
| 316 | 0.08 | 2.00 | 0.75 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
| 316L | 0.03 | 2.00 | 0.75 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
Mechanical Properties of ERW Tubes
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| 304 | 515 | 205 | 40 | 201 |
| 304L | 485 | 170 | 40 | 201 |
| 316 | 515 | 205 | 40 | 217 |
| 316L | 485 | 170 | 40 | 217 |
Grades of Stainless Steel Welded Tubes
Kamal Steels manufactures the following grades of stainless steel welded tubes:
- Stainless Steel 304 Welded Tubes
- Stainless Steel 304L Welded Tubes
- Stainless Steel 304H Welded Tubes
- Stainless Steel 310 Welded Tubes
- Stainless Steel 310S Welded Tubes
- Stainless Steel 310H Welded Tubes
- Stainless Steel 316 Welded Tubes
- Stainless Steel 316L Welded Tubes
- Stainless Steel 316H Welded Tubes
Surface Finish of Stainless Steel Welded Tubes
| Surface Finish | Description | Common Applications |
|---|---|---|
| Mill Finish (MF) | Standard finish after manufacturing. | Industrial piping & fabrication |
| Annealed & Pickled (AP) | Heat treated and acid cleaned for corrosion resistance. | Chemical & process industries |
| Bright Annealed (BA) | Smooth, bright and reflective finish. | Pharmaceutical & food processing |
| 180 Grit Polish | Satin finish with moderate smoothness. | Architectural applications |
| 240 Grit Polish | Fine brushed finish. | Decorative & fabrication |
| 320 Grit Polish | Smooth polished surface. | Food equipment & process plants |
| Mirror Finish (600 Grit) | Highly reflective decorative finish. | Interior, architectural & ornamental use |
Features of ERW Welded Tubes
Stainless steel welded tubes provide excellent strength, corrosion resistance, and dimensional consistency, making them suitable for a wide range of industrial and commercial applications.
- Excellent corrosion resistance.
- Tight dimensional tolerances.
- Smooth surface finish.
- Suitable for general service and process applications.
- Available in multiple grades and sizes.
- Easy to fabricate and install.
- Cost-effective alternative for many industrial uses.
- Reliable mechanical performance.
Applications of Stainless Steel Welded Tubes
Stainless steel welded tubes are widely used in industries requiring excellent corrosion resistance, dimensional accuracy, and reliable performance.
Instrumentation Systems
Precision tubing for instrumentation, hydraulic and pneumatic control systems.
Process Piping Systems
Suitable for transporting liquids, gases and process media in industrial facilities.
Chemical Processing Plants
Handles corrosive chemicals and process fluids with excellent durability.
Food & Beverage Processing
Provides hygienic, easy-to-clean tubing for food and beverage production lines.
Pharmaceutical Manufacturing
Ideal for contamination-free process piping in pharmaceutical facilities.
Water Treatment Plants
Used in water purification, desalination and wastewater treatment systems.
Engineering & Fabrication
Suitable for industrial fabrication, machinery and general engineering projects.
Marine & Coastal Applications
Offers excellent resistance to seawater and harsh marine environments.
Utility & Service Piping
Used for compressed air, water supply and other industrial utility services.
Industries We Serve
Kamal Steels supplies stainless steel welded tubes to industries worldwide for corrosion-resistant and industrial process applications.
Refineries
Our stainless steel welded tubes are widely used in refinery applications for process and utility systems.
Fertilizer Plants
Fertilizer industries require corrosion-resistant welded stainless tubing for chemical processing operations.
Cement Plants
These stainless steel welded tubes are suitable for industrial equipment and material handling systems.
Engineering Industry
Engineering sectors use welded stainless steel tubes for fabrication and industrial systems.
Offshore Industry
Offshore applications require durable stainless steel welded tubing with reliable corrosion resistance.
Automobile Industry
Automobile industries use stainless steel welded tubes in exhaust systems and fluid transportation applications.
Frequently Asked Questions
What is a stainless steel welded tube?
A stainless steel welded tube is made by forming stainless steel strip into a tubular shape and joining the longitudinal edges by welding. Tubes are specified by outside diameter and wall thickness, and are used in heat exchangers, instrumentation, food processing and general fabrication.
How does welded tubing differ from seamless tubing?
Welded tubing is manufactured by forming stainless steel strip and welding the longitudinal seam, while seamless tubing is produced without a welded joint. The choice depends on the required dimensions, pressure conditions, application, material specification and applicable standard.
What are the main applications of stainless steel welded tubes?
Stainless steel welded tubes are used in heat exchangers, boilers, condensers, instrumentation systems, food processing equipment, pharmaceutical plants, chemical processing and architectural fabrication. The required grade and tube specification depend on the operating environment.
What standards and dimensions apply to stainless steel welded tubes?
Common standards include ASTM A249 for welded heat-exchanger and boiler tubes, ASTM A269 for general-service tubing, ASTM A270 for sanitary tubing and ASTM A554 for mechanical tubing. Dimensions are generally specified by outside diameter, wall thickness and length, according to the applicable standard.
What is the difference between a tube and a pipe?
Tubes are sized by actual outside diameter and wall thickness, usually with tighter dimensional tolerances. Pipes are sized by nominal pipe size and schedule, and are mainly used to carry fluids. The right choice depends on the application and governing standard.
Which ASTM standards apply to stainless steel welded tubes?
ASTM A249 covers welded boiler, superheater, heat-exchanger and condenser tubes. ASTM A269 covers tubing for general service, ASTM A270 covers sanitary tubing and ASTM A554 covers mechanical tubing. Always confirm the required standard before ordering.
What is the difference between 304 and 316 stainless steel tubes?
304 is a general-purpose stainless steel grade with good corrosion resistance. 316 contains molybdenum, which improves resistance to chlorides and many chemical environments. 316L has lower carbon content and is often selected for welded fabrication.
What is an ERW tube?
ERW stands for Electric Resistance Welding. In this process, stainless steel strip edges are heated using electrical resistance and joined under pressure without adding filler metal. ERW is a commonly used method for manufacturing welded tubes.
How is stainless steel tube wall thickness specified?
Tube wall thickness is usually specified in millimetres or by BWG (Birmingham Wire Gauge). For example, BWG 16 corresponds to a nominal wall thickness of approximately 1.65 mm. Always confirm the required thickness and applicable dimensional tolerance before ordering.
Can I request a specific stainless steel tube size or surface finish?
Yes. You can specify the stainless steel grade, outside diameter, wall thickness, length, surface finish and quantity. Kamal Steels can check availability against your requirements and confirm the supply options.
What information is required for a stainless steel welded tube quotation?
Please provide the grade, outside diameter, wall thickness, required length, quantity and applicable standard. You can also share testing, inspection, material certificate, packaging and delivery requirements to help obtain an accurate quotation.
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