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Girgaon, Mumbai - 400004
Stainless Steel Welded Pipes Manufacturer in India
Stainless Steel Welded Pipes are manufactured by forming stainless steel strips or plates into a tubular shape and joining the edges through a controlled welding process. They are used across industrial sectors for fluid transfer, process piping, structural applications and equipment manufacturing, where corrosion resistance, dimensional accuracy and dependable performance are important.
Available in different stainless steel grades, outside diameters, wall thicknesses and schedules, welded pipes are supplied according to applicable ASTM, ASME and other international standards. Common grades include SS 304, 304L, 316, 316L, 321, 347, 310S and 904L, depending on the required application and specification. Manufacturing methods such as ERW and EFW are selected according to pipe dimensions, material requirements and applicable standards.
Kamal Steels is a Stainless Steel Welded Pipe Manufacturer and Stockist in India, offering welded pipes in various grades, sizes, schedules and wall thicknesses. We cater to standard as well as project-specific requirements, with supply options supported by material test certificates, inspection and testing documentation as specified by the customer.
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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 |
SS 304 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 Pipes Price List
The price of stainless steel welded pipes per kg depends on the grade, size, schedule, quantity and the current nickel and molybdenum rates. Send us your requirement for an updated quote.
| Factor | Effect on Price |
|---|---|
| Grade (304, 304L, 316, 316L, 321, 904L) | Higher nickel and molybdenum content increases the price |
| Size & Wall Thickness | Heavier schedules cost more per metre |
| Surface Finish | Polished and bright annealed pipes cost more than annealed & pickled |
| Standard & Testing | Additional tests and 3.2 certification add to the cost |
| Quantity | Bulk orders get better rates |
Standards for Stainless Steel ERW Pipes
| Standard | Covers |
|---|---|
| ASTM A312 / ASME SA312 | Seamless and straight-seam welded austenitic pipe for general corrosion and high-temperature service |
| ASTM A778 | Welded, unannealed austenitic pipe for general corrosion service |
| ASTM A358 / ASME SA358 | EFW pipe for high-temperature and corrosive service |
| ASTM A409 | Large-diameter welded pipe for corrosive or high-temperature service |
| ASTM A249 / A269 | Welded tubes (boiler, heat exchanger, general service) |
| ASME B36.19M | Dimensions of stainless steel pipe |
Grades of Stainless Steel Welded Pipe
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
Chemical Composition & Mechanical Properties
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 |
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. |
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
What is a stainless steel welded pipe?
A stainless steel welded pipe is manufactured by forming stainless steel strip or plate into a tubular shape and joining its longitudinal edges through a welding process. It is used in industrial piping, fluid transfer, structural and process applications where corrosion resistance and dimensional consistency are required.
How are stainless steel welded pipes manufactured?
Stainless steel welded pipes are manufactured by forming stainless steel strips or plates into a cylindrical shape. The edges are then joined using a suitable welding process, such as electric resistance welding (ERW) or electric fusion welding (EFW). Further operations may include sizing, heat treatment, straightening, surface finishing and inspection, depending on the applicable specification.
Which grades are used for stainless steel welded pipes?
Common stainless steel grades include 304, 304L, 316, 316L, 321, 347, 310S and 904L. Grade 304 is widely used for general corrosion-resistant applications, while Grades 316 and 316L offer improved resistance to chloride-containing environments. Other grades are selected according to temperature, corrosion conditions and service requirements.
What is the difference between welded and seamless stainless steel pipes?
Welded stainless steel pipes are manufactured by forming stainless steel strip or plate and joining the edges through welding. Seamless pipes are produced from solid billets without a longitudinal welded seam. The selection depends on the application, operating pressure and temperature, required dimensions and applicable product standard.
Which standards apply to stainless steel welded pipes?
Common specifications include ASTM A312 for specified austenitic stainless steel pipes, ASTM A358 for electric fusion welded austenitic stainless steel pipes and ASTM A778 for certain welded, unannealed austenitic stainless steel tubular products. ASME SA312 is the corresponding ASME specification for A312 pipe. Dimensional requirements may also refer to ASME B36.19M, depending on the product and application.
What is the difference between ERW, EFW and LSAW pipes?
ERW (Electric Resistance Welded) pipes are joined using electrical resistance heat and pressure. EFW (Electric Fusion Welded) pipes are manufactured using an electric fusion welding process. LSAW (Longitudinal Submerged Arc Welded) pipes are produced by forming plate into a cylindrical shape and welding the longitudinal seam using submerged arc welding. These processes differ in manufacturing method, typical dimensions and applicable specifications.
What sizes are available in stainless steel welded pipes?
Stainless steel welded pipes are available in different outside diameters, nominal pipe sizes, wall thicknesses and lengths. The available range depends on the manufacturing process, material grade, applicable standard and production or stock availability. Share your required dimensions with Kamal Steels to check suitable options.
How do I select the correct schedule for stainless steel welded pipes?
Pipe schedule indicates a standard wall-thickness series for a given nominal pipe size. Common stainless steel schedules include SCH 5S, 10S, 40S and 80S. Selection depends on design pressure, operating temperature, pipe size, material grade and applicable design code. The allowable working pressure must be verified for the specific pipe and service conditions.
What is the price of stainless steel welded pipes in India?
The price depends on the stainless steel grade, outside diameter, wall thickness, schedule, surface finish, order quantity and applicable manufacturing specification. Current raw material rates also influence pricing. Contact Kamal Steels with your required specifications and quantity to request a quotation.
What surface finishes are available for stainless steel welded pipes?
Stainless steel welded pipes can be supplied with finishes such as mill finish, pickled, bright annealed, brushed, satin and polished, depending on the manufacturing process and product specification. The required finish is generally selected according to the application, surface condition and appearance requirements.
What tests are performed on stainless steel welded pipes?
Testing requirements depend on the applicable standard and purchase specification. Common tests and inspections may include chemical analysis, tensile testing, flattening or bend tests, hydrostatic testing, non-destructive examination, dimensional checks and visual inspection. Additional testing can be specified for particular projects.
Do stainless steel welded pipes come with Mill Test Certificates?
Stainless steel welded pipes can be supplied with Mill Test Certificates (MTC) showing relevant chemical composition and mechanical test results. EN 10204 Type 3.1 inspection certificates and other quality documents can also be provided according to the order and customer requirements.
Can stainless steel welded pipes be supplied in custom sizes and lengths?
Yes. Stainless steel welded pipes can be supplied in specified outside diameters, wall thicknesses, schedules, lengths and end preparations, subject to manufacturing capabilities and stock availability. Buyers can share their drawings or technical specifications to check the available supply options.
Is third-party inspection available for stainless steel welded pipes?
Third-party inspection can be arranged according to customer or project requirements. Depending on the agreed inspection scope, it may include material verification, dimensional checks, testing, documentation review and pre-dispatch inspection through agencies such as SGS, TÜV or Bureau Veritas.
What information is required for a stainless steel welded pipe quotation?
Please provide the stainless steel grade, outside diameter or nominal pipe size, schedule or wall thickness, required length, quantity and applicable standard. You can also share surface finish, testing, material certificate, third-party inspection, packaging and delivery requirements to help Kamal Steels prepare an accurate quotation.