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Girgaon, Mumbai - 400004
Stainless Steel Welded Pipes Manufacturer in India
Trusted Global Manufacturer & Stockist of Stainless Steel Welded Pipes
Kamal Steels is a trusted Manufacturer and Stockist of Stainless Steel Welded Pipes in India, offering a comprehensive range of welded pipes for industrial, commercial and engineering applications. Manufactured in accordance with ASTM A312, ASME SA312, ASTM A358 and other internationally recognized standards, our welded pipes are produced from certified stainless steel grades including 304, 304L, 316, 316L, 321, 347, 310S and 904L to ensure consistent quality, dimensional accuracy and dependable performance in demanding operating conditions.
Stainless Steel Welded Pipes provide an economical and reliable solution for fluid transportation, process piping, structural applications and pressure systems where corrosion resistance, strength, and fabrication flexibility are essential. Available in a wide range of diameters, wall thicknesses, schedules, surface finishes and custom lengths, our welded pipes are widely used across the oil & gas, petrochemical, chemical processing, pharmaceutical, food processing, power generation, marine, construction and water treatment industries.
Every Stainless Steel Welded Pipe manufactured by Kamal Steels undergoes stringent quality inspections, including dimensional verification, weld integrity checks, hydrostatic testing and material traceability, before dispatch. With extensive ready stock, project-specific manufacturing capabilities and timely delivery, we support customers across India and international markets with stainless steel welded pipes engineered for long-term reliability and performance.
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Stainless Steel Welded Pipe Specifications
| Product Name | Stainless Steel Welded Pipes |
|---|---|
| Brand | Kamal Steels |
| Material | Stainless Steel |
| Type | Welded Pipe |
| Manufacturing Process | TIG Welded, ERW Welded, Laser Welded |
| Weld Type | Longitudinal Welded Seam |
| Available Grades | 304, 304L, 316, 316L, 321, 347, 904L |
| Form | Round, Square, Rectangular |
| Outer Diameter | 6 mm to 610 mm |
| Wall Thickness | 0.5 mm to 40 mm |
| Length | Single Random, Double Random, Cut Length |
| Pipe End | Plain End, Beveled End, Threaded End |
| Surface Finish | Annealed, Pickled, Polished, Bright Annealed |
| Standards | ASTM A312, ASTM A358, ASTM A778, ASME SA312, ASME B36.19M |
| Pipe Schedules | SCH 5, SCH 10, SCH 40, SCH 80, SCH 160, SCH XXS |
| Applications | Industrial Process Piping, Water Treatment, Food Processing, Pharmaceutical, Construction and Structural Applications |
Stainless Steel Welded Pipe Size Chart
The following chart shows the standard nominal bore (NB), nominal pipe size (NPS) and outside diameter (OD) of stainless steel welded pipes manufactured according to ASTM A312 and ASME B36.19M.
| Nominal Bore (NB) | NPS (Inch) | Outside Diameter (OD) mm |
|---|---|---|
| 3 | 1/8" | 10.3 |
| 6 | 1/4" | 13.7 |
| 10 | 3/8" | 17.1 |
| 15 | 1/2" | 21.3 |
| 20 | 3/4" | 26.7 |
| 25 | 1" | 33.4 |
| 32 | 1 1/4" | 42.2 |
| 40 | 1 1/2" | 48.3 |
| 50 | 2" | 60.3 |
| 65 | 2 1/2" | 73.0 |
| 80 | 3" | 88.9 |
| 100 | 4" | 114.3 |
| 125 | 5" | 141.3 |
| 150 | 6" | 168.3 |
| 200 | 8" | 219.1 |
| 250 | 10" | 273.1 |
| 300 | 12" | 323.9 |
| 350 | 14" | 355.6 |
| 400 | 16" | 406.4 |
| 450 | 18" | 457.2 |
| 500 | 20" | 508.0 |
| 600 | 24" | 609.6 |
Stainless Steel Welded Pipe Weight Chart
The following chart shows the approximate weight per metre of stainless steel welded pipes for different schedules. Values are for reference only and may vary slightly depending on manufacturing tolerances.
| NPS (Inch) | OD (mm) | SCH 5S (kg/m) |
SCH 10S (kg/m) |
SCH 40S (kg/m) |
SCH 80S (kg/m) |
SCH 160 (kg/m) |
XXS (kg/m) |
|---|---|---|---|---|---|---|---|
| 1/8" | 10.3 | 0.27 | 0.27 | 0.37 | 0.49 | — | — |
| 1/4" | 13.7 | 0.38 | 0.49 | 0.63 | 0.83 | — | — |
| 3/8" | 17.1 | 0.48 | 0.63 | 0.86 | 1.17 | — | — |
| 1/2" | 21.3 | 0.81 | 1.02 | 1.27 | 1.62 | 2.07 | 2.42 |
| 3/4" | 26.7 | 1.03 | 1.30 | 1.69 | 2.23 | 2.92 | 3.38 |
| 1" | 33.4 | 1.32 | 2.13 | 2.50 | 3.24 | 4.29 | 5.09 |
| 1 1/4" | 42.2 | 1.69 | 2.86 | 3.39 | 4.55 | 6.16 | 7.32 |
| 1 1/2" | 48.3 | 1.95 | 3.30 | 4.05 | 5.53 | 7.54 | 8.98 |
| 2" | 60.3 | 2.46 | 4.14 | 5.44 | 7.48 | 10.42 | 12.46 |
| 2 1/2" | 73.0 | 3.73 | 5.37 | 8.63 | 11.59 | 16.24 | 19.49 |
| 3" | 88.9 | 4.56 | 6.59 | 11.29 | 15.27 | 21.59 | 25.57 |
| 4" | 114.3 | 5.92 | 8.52 | 16.07 | 22.32 | 31.55 | 37.77 |
| 5" | 141.3 | 8.63 | 10.58 | 21.77 | 31.43 | 45.42 | 53.96 |
| 6" | 168.3 | 10.37 | 12.70 | 28.26 | 42.56 | 56.98 | 67.54 |
| 8" | 219.1 | 13.57 | 18.40 | 42.55 | 63.54 | 84.81 | 101.16 |
| 10" | 273.1 | 18.60 | 22.92 | 60.32 | 81.93 | 109.57 | 130.47 |
| 12" | 323.9 | 24.12 | 27.91 | 71.58 | 96.91 | 129.73 | 154.46 |
| 14" | 355.6 | 26.48 | 31.96 | 94.55 | 125.56 | 168.84 | 201.26 |
| 16" | 406.4 | 31.18 | 35.61 | 123.27 | 159.84 | 214.37 | 255.43 |
| 18" | 457.2 | 35.09 | 40.08 | 154.64 | 194.82 | 261.45 | 311.52 |
| 20" | 508.0 | 40.62 | 46.95 | 183.47 | 230.56 | 309.83 | 369.17 |
| 24" | 609.6 | 53.86 | 61.68 | 255.34 | 318.59 | 428.76 | 510.84 |
Stainless Steel Welded Pipe Schedule Chart
The following chart shows the standard schedules available for stainless steel welded pipes manufactured according to ASTM A312 and ASME B36.19M.
| Pipe Schedule | Wall Thickness | Typical Applications |
|---|---|---|
| SCH 5S | Extra Light | Low-pressure water & drainage systems |
| SCH 10S | Light | Food processing & pharmaceutical piping |
| SCH 40S | Standard | Industrial process piping |
| SCH 80S | Heavy | High-pressure process lines |
| SCH 160 | Extra Heavy | Oil & gas and power plants |
| XXS | Double Extra Strong | Critical pressure applications |
Stainless Steel Welded Pipe Dimensions Chart
The table below provides the standard dimensions of stainless steel welded pipes manufactured in accordance with ASME B36.19M.
| NPS (Inch) | Outside Diameter (OD) mm | Inside Diameter (ID)* mm | Standard Length |
|---|---|---|---|
| 1/2" | 21.3 | 15.8 | 6 m / Custom |
| 3/4" | 26.7 | 20.9 | 6 m / Custom |
| 1" | 33.4 | 26.6 | 6 m / Custom |
| 2" | 60.3 | 52.5 | 6 m / Custom |
| 3" | 88.9 | 77.9 | 6 m / Custom |
| 4" | 114.3 | 102.3 | 6 m / Custom |
| 6" | 168.3 | 154.1 | 6 m / Custom |
| 8" | 219.1 | 202.7 | 6 m / Custom |
| 10" | 273.1 | 254.6 | 6 m / Custom |
| 12" | 323.9 | 304.9 | 6 m / Custom |
Stainless Steel Welded Pipe Pressure Rating Chart
The pressure rating of stainless steel welded pipes depends on the pipe schedule, material grade, operating temperature and pipe size.
| Pipe Schedule | Pressure Rating | Recommended Service |
|---|---|---|
| SCH 5S | Low Pressure | Water distribution & drainage |
| SCH 10S | Medium Pressure | Food processing & chemical transfer |
| SCH 40S | High Pressure | Industrial process piping |
| SCH 80S | Very High Pressure | Steam, petrochemical & refinery |
| SCH 160 | Heavy Duty | Power plants & offshore piping |
| XXS | Maximum Pressure | Critical industrial applications |
Chemical Composition of Stainless Steel Welded Pipe
The following table shows the typical chemical composition of commonly used stainless steel welded pipe grades manufactured in accordance with ASTM A312.
| Grade | C (%) | Cr (%) | Ni (%) | Mo (%) | Mn (%) | Si (%) |
|---|---|---|---|---|---|---|
| 304 | 0.08 Max | 18.0–20.0 | 8.0–10.5 | — | 2.00 Max | 1.00 Max |
| 304L | 0.03 Max | 18.0–20.0 | 8.0–12.0 | — | 2.00 Max | 1.00 Max |
| 316 | 0.08 Max | 16.0–18.0 | 10.0–14.0 | 2.00–3.00 | 2.00 Max | 1.00 Max |
| 316L | 0.03 Max | 16.0–18.0 | 10.0–14.0 | 2.00–3.00 | 2.00 Max | 1.00 Max |
| 321 | 0.08 Max | 17.0–19.0 | 9.0–12.0 | — | 2.00 Max | 1.00 Max |
| 347 | 0.08 Max | 17.0–19.0 | 9.0–13.0 | — | 2.00 Max | 1.00 Max |
| 310S | 0.08 Max | 24.0–26.0 | 19.0–22.0 | — | 2.00 Max | 1.50 Max |
| 904L | 0.02 Max | 19.0–23.0 | 23.0–28.0 | 4.00–5.00 | 2.00 Max | 1.00 Max |
Mechanical Properties of Stainless Steel Welded Pipe
The following table provides the minimum mechanical properties of stainless steel welded pipes manufactured according to ASTM A312.
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB Max) |
|---|---|---|---|---|
| 304 | 515 | 205 | 35 | 201 |
| 304L | 485 | 170 | 35 | 201 |
| 316 | 515 | 205 | 35 | 217 |
| 316L | 485 | 170 | 35 | 217 |
| 321 | 515 | 205 | 35 | 217 |
| 347 | 515 | 205 | 35 | 217 |
| 310S | 515 | 205 | 40 | 217 |
| 904L | 490 | 220 | 35 | 215 |
Stainless Steel Welded Pipe vs Seamless Pipe
Stainless steel welded pipes and seamless pipes are widely used across industrial applications. The following comparison highlights the key differences to help you select the right pipe for your project requirements.
| Feature | Stainless Steel Welded Pipe | Stainless Steel Seamless Pipe |
|---|---|---|
| Manufacturing Process | Manufactured by rolling stainless steel coils or plates and welding the seam. | Manufactured from a solid stainless steel billet without any welded joint. |
| Cost | More economical for most industrial applications. | Higher manufacturing cost due to the seamless production process. |
| Pressure Rating | Suitable for low to high-pressure applications depending on the schedule. | Preferred for very high-pressure and critical service applications. |
| Available Sizes | Available in a wider range of diameters, wall thicknesses and custom lengths. | Available in standard sizes with some manufacturing limitations. |
| Surface Finish | Smooth internal and external finish with consistent dimensional accuracy. | Excellent finish after processing, depending on the manufacturing method. |
| Dimensional Accuracy | Excellent dimensional consistency and tight tolerances. | Good dimensional accuracy with slight manufacturing variations. |
| Availability | Readily available with shorter production and delivery times. | Availability may vary depending on size, grade and production schedule. |
| Typical Applications | Process piping, structural fabrication, water treatment, food processing, pharmaceutical and construction. | Oil & gas, petrochemical, power generation, high-pressure pipelines and critical process systems. |
| Best Choice | Projects requiring cost-effective, corrosion-resistant piping with excellent dimensional accuracy. | Applications requiring maximum strength, high pressure resistance and demanding operating conditions. |
Grades of Stainless Steel Welded Pipes
Kamal Steels manufactures the following grades of Austenitic stainless steel pipes:
- Stainless Steel 304 Welded Pipes
- Stainless Steel 304L Welded Pipes
- Stainless Steel 304H Welded Pipes
- Stainless Steel 310 Welded Pipes
- Stainless Steel 310S Welded Pipes
- Stainless Steel 310H Welded Pipes
- Stainless Steel 316 Welded Pipes
- Stainless Steel 316L Welded Pipes
- Stainless Steel 316H Welded Pipes
Features of Stainless Steel Welded Pipes
- Excellent corrosion and oxidation resistance
- High strength with precision welded construction
- Smooth internal and external surface finish
- Available in ASTM A312, A358 and A778 standards
- Offered in multiple grades including 304, 316, 321, 347 and 904L
- Suitable for high-temperature and corrosive environments
- Excellent weldability, formability and fabrication properties
- Available in various sizes, schedules, lengths and surface finishes
Applications of Stainless Steel Welded Pipes
Stainless Steel Welded Pipes are widely used in fluid handling, structural fabrication and industrial process systems where corrosion resistance, dimensional accuracy and long service life are essential.
Process Piping Systems
Used for transporting water, steam, chemicals, gases and process fluids in industrial piping networks.
High-Pressure Fluid Lines
Suitable for medium and high-pressure fluid transfer systems requiring strength, reliability and leak-free performance.
Chemical Transfer Lines
Ideal for conveying corrosive chemicals, acids and industrial liquids with excellent corrosion resistance.
Steam Distribution Systems
Used in steam pipelines for power plants, manufacturing facilities and industrial heating applications.
Heat Exchanger Systems
Widely used for heat transfer equipment, condensers and cooling systems due to excellent durability.
Boiler Piping
Suitable for boiler installations handling high-temperature water and steam under demanding operating conditions.
Instrumentation Lines
Used for precision fluid and gas control systems in process plants, laboratories and industrial automation.
Fire Fighting Systems
Used in fire protection and sprinkler systems where dependable performance and corrosion resistance are required.
Structural Fabrication
Applied in industrial structures, equipment frames, supports and fabrication projects requiring high strength.
Architectural Projects
Used in handrails, decorative structures, commercial buildings and architectural installations with an attractive finish.
Marine Piping
Suitable for seawater handling, shipbuilding and offshore piping systems exposed to corrosive marine environments.
Water Treatment Systems
Used in water purification, desalination and wastewater treatment plants for reliable long-term service.
Industries We Serve
Kamal Steels supplies Stainless Steel Welded Pipes to a wide range of industries worldwide, providing reliable piping solutions for corrosive, high-pressure and demanding operating environments.
Oil & Gas
Used for upstream, midstream and downstream piping systems handling crude oil, natural gas and refined petroleum products.
Petrochemical Industry
Ideal for transporting chemicals, hydrocarbons and process fluids in petrochemical manufacturing facilities.
Chemical Processing
Suitable for corrosive chemical processing plants requiring durable and corrosion-resistant piping systems.
Power Generation
Used in thermal, nuclear and renewable power plants for steam, cooling water and process piping applications.
Pharmaceutical Industry
Preferred for hygienic process piping systems that meet strict cleanliness and product quality requirements.
Food & Beverage
Used in sanitary processing lines for food, dairy and beverage manufacturing requiring contamination-free operation.
Water Treatment
Applied in water purification, wastewater treatment and desalination facilities for long-lasting corrosion resistance.
Marine & Offshore
Designed for offshore platforms, shipbuilding and seawater piping systems exposed to harsh marine environments.
Construction
Widely used in commercial buildings, industrial structures and infrastructure projects for durable piping solutions.
Infrastructure
Suitable for bridges, transportation networks, public utilities and large-scale infrastructure developments.
Pulp & Paper
Used in pulp mills and paper manufacturing plants for chemical handling and process piping systems.
Sugar Plants
Applied in sugar processing equipment and pipelines requiring corrosion resistance and long service life.
LNG Plants
Suitable for liquefied natural gas production, storage and distribution systems operating under demanding conditions.
Mining Industry
Used in mining operations for slurry transfer, mineral processing and heavy-duty industrial piping applications.
Desalination Plants
Preferred for seawater desalination systems due to excellent corrosion resistance in chloride-rich environments.
Frequently Asked Questions
Stainless steel welded pipes are manufactured by forming stainless steel coils or plates into a tubular shape and joining the edges using welding processes such as TIG, laser or high-frequency welding.
Stainless steel welded pipes are widely used in water treatment, food processing, pharmaceutical, construction, chemical processing, marine and general industrial applications.
Kamal Steels supplies stainless steel welded pipes in grades 304, 304L, 316, 316L, 321, 347, 310, 310S and 904L.
SS 316 welded pipes contain molybdenum, which provides better resistance to chlorides and corrosive environments compared to SS 304 welded pipes.
We supply stainless steel welded pipes in sizes ranging from 6 mm to 610 mm outer diameter with various wall thicknesses and schedules.
Our stainless steel welded pipes are supplied according to ASTM A312, ASTM A358, ASTM A778, ASME SA312 and ANSI B36.19 standards.
SCH 40S and SCH 80S indicate pipe wall thickness. SCH 80S welded pipes have thicker walls and are suitable for higher-pressure applications than SCH 40S pipes.
Yes, all stainless steel welded pipes are supplied with Mill Test Certificates (MTC) and relevant quality documentation.
Yes, Kamal Steels exports stainless steel welded pipes worldwide with export-standard packaging, documentation and logistics support.
Contact Kamal Steels with your required grade, size, schedule and quantity to receive the latest stainless steel welded pipe price and stock availability.
ASTM A312 covers seamless and welded austenitic stainless steel pipes for high-temperature and corrosive service, while ASTM A358 covers electric fusion welded (EFW) stainless steel pipes, typically manufactured in larger diameters for high-temperature and corrosive applications.
Yes. Stainless steel welded pipes are available in a variety of surface finishes, including mill finish, pickled, bright annealed, satin, brushed and mirror polished. Polished welded pipes are widely used in architectural, food processing, pharmaceutical and decorative applications.
Yes. Kamal Steels supplies stainless steel welded pipes in custom lengths, outside diameters, wall thicknesses, schedules and end preparations to meet specific project and fabrication requirements.
The best pipe schedule depends on the operating pressure, temperature and application. SCH 10S is commonly used for general process piping, SCH 40S is suitable for standard industrial applications, while SCH 80S and heavier schedules are preferred for high-pressure and demanding service conditions.
Yes. Kamal Steels can arrange third-party inspection through internationally recognized agencies such as SGS, TUV, Bureau Veritas (BV), DNV and Lloyd's Register. Inspection reports, EN 10204 3.1 Mill Test Certificates and other quality documents can be supplied before dispatch upon request.