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Girgaon, Mumbai - 400004
Stainless Steel Seamless Pipes Manufacturer in India
Kamal Steels is a Stainless Steel Seamless Pipe Manufacturer in India, Supplier, Stockist and Exporter offering high-quality seamless stainless steel pipes for industrial and engineering applications. As an experienced Stainless Steel Seamless Pipe Supplier, we provide pipes in different grades, sizes, schedules, wall thicknesses and specifications to meet project and application requirements.
Our Stainless Steel Seamless Pipes are manufactured and supplied according to applicable ASTM, ASME and dimensional standards. Kamal Steels serves domestic and international buyers looking for reliable Seamless Stainless Steel Pipe Suppliers with consistent product quality, technical support and export-ready packaging.
What are Stainless Steel Seamless Pipes?
Stainless Steel Seamless Pipes are manufactured from a solid stainless steel billet without any welded seam, providing excellent pressure resistance, superior mechanical strength and outstanding corrosion protection. Their seamless construction ensures uniform wall thickness and reliable performance in high-pressure, high-temperature and corrosive service environments. These pipes are widely used for transporting liquids, gases, steam, and process fluids across industries where safety, durability and long service life are essential.
Kamal Steels is a trusted Manufacturer and Stockist of Stainless Steel Seamless Pipes in India, supplying high-quality pipes manufactured in accordance with ASTM, ASME and other international standards. Our product range includes stainless steel grades such as 304, 304L, 316, 316L, 321, 347, 310S and 904L, ensuring the right material for diverse industrial applications.
Available in a wide range of nominal pipe sizes, schedules, wall thicknesses, surface finishes, and custom lengths, our Stainless Steel Seamless Pipes are suitable for oil & gas, petrochemical, chemical processing, pharmaceutical, food processing, marine, power generation, pulp & paper and water treatment industries. Every pipe undergoes strict quality inspection and is supplied with Mill Test Certificates (MTC) to ensure compliance with international standards.
With extensive ready stock, project-specific manufacturing capabilities, competitive pricing, and timely worldwide delivery, Kamal Steels supports domestic and international customers with stainless steel seamless pipes designed to deliver long-term reliability and consistent performance.
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Stainless Steel Seamless Pipe Specifications
| Product Name | Stainless Steel Seamless Pipes |
|---|---|
| Standards | ASTM A312, ASTM A358, ASTM A790, ASME SA312 |
| Material Grades | 304, 304L, 310, 310S, 316, 316L, 316Ti, 317L, 321, 347, 347H, 904L, Duplex & Super Duplex |
| Manufacturing Process | Hot Finished / Cold Drawn Seamless |
| Outside Diameter | 1/8" NB to 24" NB (10.3 mm to 609.6 mm) |
| Wall Thickness | SCH 5S to SCH XXS |
| Length | Single Random, Double Random, 6 Meter or Custom Cut Lengths |
| Pipe Ends | Plain End (PE), Beveled End (BE), Threaded |
| Surface Finish | Annealed, Pickled, Bright Annealed (BA), Polished |
| Testing | Hydrostatic Test, PMI, Ultrasonic Test, Eddy Current Test, Flattening Test, Flaring Test, Third-Party Inspection |
| Certification | EN 10204 3.1 MTC, ISO Certified |
| Applications | Oil & Gas, Petrochemical, Chemical Processing, Power Plants, Marine, Food Processing, Pharmaceutical & Water Treatment |
Stock and Availability of Stainless Steel Seamless Pipes
| Stainless Steel TP 304 Seamless Pipes | Stainless Steel TP 304L Seamless Pipes |
| ASTM A312 Stainless Steel Seamless Pipes | ASME SA312 Stainless Steel Seamless Pipes |
| ASTM A213 Stainless Steel Boiler & Heat Exchanger Tubes | Stainless Steel Seamless Boiler Pipes |
| Schedule 5S Stainless Steel Seamless Pipes | Schedule 10S Stainless Steel Seamless Pipes |
| Schedule 40S Stainless Steel Seamless Pipes | Schedule 80S Stainless Steel Seamless Pipes |
| Schedule 160 Stainless Steel Seamless Pipes | XXS Stainless Steel Seamless Pipes |
Grades of Stainless Steel Seamless Pipes
- Stainless Steel 304 Seamless Pipes
- Stainless Steel 304L Seamless Pipes
- Stainless Steel 304H Seamless Pipes
- Stainless Steel 310 Seamless Pipes
- Stainless Steel 310S Seamless Pipes
- Stainless Steel 310H Seamless Pipes
- Stainless Steel 316 Seamless Pipes
- Stainless Steel 316L Seamless Pipes
- Stainless Steel 316H Seamless Pipes
Stainless Steel Seamless Pipe Standards
Stainless steel seamless pipes are manufactured and supplied according to international ASTM and ASME standards that define requirements for material, dimensions, mechanical properties, testing and manufacturing. The applicable standard depends on the stainless steel grade, pipe application, size and project requirements.
| Standard | Description |
|---|---|
| ASTM A312 | Specification for seamless, welded and heavily cold worked austenitic stainless steel pipes for high-temperature and general corrosive service. |
| ASME SA312 | ASME specification covering seamless, welded and heavily cold worked austenitic stainless steel pipes for pressure applications. |
| ASTM A213 | Specification for seamless ferritic and austenitic alloy-steel boiler, superheater and heat-exchanger tubes. |
| ASTM A789 | Specification for seamless and welded ferritic/austenitic stainless steel tubing for general service and corrosive environments. |
| ASME SA213 | ASME specification for seamless ferritic and austenitic alloy-steel boiler, superheater and heat-exchanger tubes. |
Common dimensional requirements for stainless steel seamless pipes are also specified through applicable ASME B36.10M and ASME B36.19M standards, depending on the pipe material and dimensional requirements. Buyers should confirm the required ASTM or ASME specification, grade, NPS, schedule, wall thickness and testing requirements before placing an order.
Stainless Steel Seamless Pipe Size Chart
Stainless Steel Seamless Pipes are available in various nominal pipe sizes (NPS), nominal bore (NB) and outside diameters (OD) to meet the requirements of industrial piping systems. The chart below provides the standard pipe sizes 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 Pipe Schedule Chart
The table below shows the standard wall thickness for common stainless steel pipe schedules manufactured in accordance with ASME B36.19M and ASTM A312.
| Pipe Schedule | Description | Common Applications |
|---|---|---|
| SCH 5S | Extra Light Wall | Low-pressure services |
| SCH 10S | Light Wall | Food, pharmaceutical & water lines |
| SCH 40S | Standard Wall | General industrial piping |
| SCH 80S | Heavy Wall | High-pressure applications |
| SCH 160 | Extra Heavy Wall | High-temperature & high-pressure systems |
| XXS | Double Extra Strong | Critical industrial applications |
Stainless Steel Pipe Dimensions Chart
The following chart provides the standard outside diameter, inside diameter and wall thickness dimensions for stainless steel seamless pipes.
| NPS (Inch) | Outside Diameter (OD) | Inside Diameter (ID)* | Standard |
|---|---|---|---|
| 1/2" | 21.3 mm | 15.8 mm | ASME B36.19M |
| 3/4" | 26.7 mm | 21.0 mm | ASME B36.19M |
| 1" | 33.4 mm | 26.6 mm | ASME B36.19M |
| 2" | 60.3 mm | 52.5 mm | ASME B36.19M |
| 3" | 88.9 mm | 77.9 mm | ASME B36.19M |
| 4" | 114.3 mm | 102.3 mm | ASME B36.19M |
| 6" | 168.3 mm | 154.1 mm | ASME B36.19M |
| 8" | 219.1 mm | 202.7 mm | ASME B36.19M |
Stainless Steel Pipe Weight Chart
The following chart provides the approximate weight per metre (kg/m) of stainless steel seamless pipes in different schedules. Actual weights may vary slightly depending on manufacturing tolerances and applicable standards.
| 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 | 0.28 | 0.28 | 0.38 | 0.51 | 0.71 | 0.71 |
| 1/4" | 13.7 | 0.38 | 0.51 | 0.71 | 0.98 | 1.34 | 1.34 |
| 3/8" | 17.1 | 0.48 | 0.64 | 0.81 | 1.15 | 1.58 | 1.58 |
| 1/2" | 21.3 | 0.77 | 1.00 | 1.27 | 1.62 | 2.09 | 2.09 |
| 3/4" | 26.7 | 1.00 | 1.27 | 1.69 | 2.22 | 2.87 | 2.87 |
| 1" | 33.4 | 1.27 | 1.95 | 2.50 | 3.24 | 4.55 | 4.55 |
| 1 1/4" | 42.2 | 1.62 | 2.49 | 3.39 | 4.47 | 6.10 | 6.10 |
| 1 1/2" | 48.3 | 1.86 | 2.86 | 4.05 | 5.41 | 7.63 | 7.63 |
| 2" | 60.3 | 2.50 | 3.64 | 5.44 | 7.48 | 10.97 | 10.97 |
| 2 1/2" | 73.0 | 3.64 | 5.26 | 8.63 | 11.41 | 16.25 | 16.25 |
| 3" | 88.9 | 4.45 | 6.43 | 11.29 | 15.27 | 21.95 | 21.95 |
| 4" | 114.3 | 5.73 | 8.30 | 16.07 | 22.32 | 32.61 | 32.61 |
| 5" | 141.3 | 8.05 | 9.84 | 21.77 | 31.41 | 46.70 | 46.70 |
| 6" | 168.3 | 9.62 | 11.79 | 28.26 | 42.56 | 63.63 | 63.63 |
| 8" | 219.1 | 12.63 | 17.12 | 42.55 | 63.64 | 94.60 | 94.60 |
| 10" | 273.1 | 17.07 | 21.00 | 60.32 | 82.24 | 121.73 | 121.73 |
| 12" | 323.9 | 22.22 | 25.79 | 71.58 | 94.57 | 140.91 | 140.91 |
| 14" | 355.6 | 24.45 | 29.31 | 94.55 | 151.46 | — | 188.90 |
| 16" | 406.4 | 29.72 | 33.68 | 123.27 | 163.68 | — | 216.44 |
| 18" | 457.2 | 33.43 | 37.95 | 154.64 | 206.17 | — | 272.73 |
| 20" | 508.0 | 38.32 | 44.52 | 183.47 | 247.58 | — | 327.90 |
| 24" | 609.6 | 49.55 | 56.77 | 255.34 | 338.63 | — | 448.95 |
Pipe Weight Formula: Weight (kg/m) = (Outside Diameter − Wall Thickness) × Wall Thickness × 0.02466
Request Price ListStainless Steel Pipe Pressure Rating Chart
The pressure rating of stainless steel seamless pipes depends on pipe size, wall thickness, schedule, material grade and operating temperature.
| Pipe Schedule | Pressure Capacity | Typical Service |
|---|---|---|
| SCH 5S | Low | Drainage & low-pressure systems |
| SCH 10S | Medium | Water & process piping |
| SCH 40S | High | Industrial process piping |
| SCH 80S | Very High | Steam & chemical plants |
| SCH 160 | Heavy Duty | Oil & gas pressure lines |
| XXS | Maximum | Critical high-pressure applications |
Chemical Composition of Stainless Steel Seamless Pipes
The following table shows the typical chemical composition of the most commonly used stainless steel seamless pipe grades. Values are specified according to ASTM and ASME material standards.
| Grade | Carbon (%) | Chromium (%) | Nickel (%) | Molybdenum (%) | Manganese (%) | Silicon (%) |
|---|---|---|---|---|---|---|
| 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 Seamless Pipes
The table below provides the minimum mechanical properties of commonly used stainless steel seamless pipe grades manufactured in accordance with 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 |
Features of Stainless Steel Seamless Pipes
- Excellent corrosion and oxidation resistance
- Seamless construction for improved strength
- Suitable for high-pressure applications
- Reliable performance at elevated temperatures
- Durable Performance with low maintenance
- Available in multiple grades and schedules
- Excellent dimensional accuracy and finish
- Suitable for critical industrial applications
Applications of Stainless Steel Seamless Pipes
Stainless Steel Seamless Pipes are designed for applications where high pressure, elevated temperatures and corrosive media demand reliable performance. Their seamless construction eliminates the risk associated with welded joints, making them suitable for transporting liquids, gases, steam, and aggressive chemicals in critical industrial processes. The choice of stainless steel grade depends on the operating environment, pressure requirements, temperature and corrosion conditions.
| Industry | Typical Applications |
|---|---|
| Oil & Gas Industry | Process piping, transmission lines, refinery systems |
| Petrochemical Industry | Chemical transfer and processing systems |
| Power Plant Industry | Boiler tubes, steam lines, heat exchangers |
| Water Treatment | Desalination and water distribution systems |
| Pharmaceutical | Hygienic process piping and fluid transfer |
| Food Processing | Sanitary piping systems and equipment |
| Marine | Seawater handling and offshore installations |
| Chemical Industry | Corrosive fluid and chemical transportation |
Industries Using Stainless Steel Seamless Pipes
Kamal Steels supplies Stainless Steel Seamless Pipes to a wide range of industries that require durable, corrosion-resistant piping solutions for critical process systems. Manufactured to international standards and available in multiple grades and schedules, our seamless pipes are used in demanding environments where safety, strength and long service life are essential.
Refineries
Our Stainless Steel Seamless Pipes are extensively used in refineries for high-pressure process piping, hydrocarbon transportation and critical fluid handling systems.
Chemical & Petrochemical Plants
Seamless pipes provide excellent corrosion resistance and strength for handling aggressive chemicals, acids and process fluids.
Power Generation
Power plants rely on seamless pipes for boilers, heat exchangers, steam lines and high-temperature applications.
Engineering Industry
Engineering companies use Stainless Steel Seamless Pipes for heavy-duty equipment, fabrication and precision industrial piping systems.
Offshore Industry
Offshore platforms require seamless pipes for reliable performance under high pressure and corrosive marine environments.
Marine & Shipbuilding
Marine industries utilize seamless pipes for seawater systems, fuel lines and other critical shipboard piping applications.
Pharmaceutical Industry
Pharmaceutical plants use seamless stainless steel pipes where hygiene, corrosion resistance and contamination-free fluid transfer are required.
Oil & Gas Industry
Seamless pipes are widely used for upstream, midstream and downstream oil and gas operations involving high-pressure and demanding service conditions.
Related Stainless Steel Pipe Resources
- Stainless Steel Tube Size Chart
- Stainless Steel Pipe Weight Chart
- Stainless Steel Seamless Tubes
- Stainless Steel 304 Welded Pipes
- Stainless Steel 304 Welded Tubes
- Request Stainless Steel Seamless Pipe Pricing
Frequently Asked Questions
A stainless steel seamless pipe is a tubular product manufactured without a longitudinal weld seam. Its suitability depends on the grade, dimensions, product specification, design requirements and service conditions.
Seamless pipe has no longitudinal weld seam, while welded pipe is formed from strip, sheet or plate and joined by welding. Both can be used when they comply with the applicable specification and engineering requirements.
ASTM A312 stainless steel pipe is used for applicable high-temperature and general corrosive-service applications. The correct grade, dimensions and design code must be selected for the specific service.
SS 304 is commonly selected for general corrosion-resistant applications. SS 316 contains molybdenum and is often selected where improved resistance to chlorides or certain chemical environments is required. The correct choice depends on the actual service conditions.
Stainless steel seamless pipe may be available from 1/8 inch NB to 24 inch NB in different grades, schedules and lengths. Availability depends on the required product specification, size and quantity.
No. Schedule identifies a wall-thickness series, but pressure suitability also depends on material grade, pipe size, design temperature, allowable stress, corrosion allowance, design code and service conditions.
Depending on the order requirements, documentation may include an EN 10204 3.1 material test certificate, PMI report, hydrostatic test certificate, dimensional inspection report and third-party inspection report.
Fixed or cut lengths may be available depending on the grade, size, manufacturing route and purchase specification. Confirm the required length and tolerance when requesting a quotation.
Applications may include chemical processing, oil and gas, petrochemical, power generation, water treatment, pharmaceutical, food processing, marine and industrial manufacturing systems.
Provide the grade, seamless pipe specification, NPS or NB size, schedule or wall thickness, length, quantity, end finish, testing requirements, certification requirements and delivery location.