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Girgaon, Mumbai - 400004
Stainless Steel Seamless Tubes Manufacturer in India
Trusted Global Manufacturer & Stockist of Stainless Steel Seamless Tubes
Kamal Steels, established in 1984, is a trusted Manufacturer and Stockist of Stainless Steel Seamless Tubes in India. These tubes are manufactured without a welded joint, providing excellent structural integrity, superior pressure resistance, and reliable performance for demanding industrial applications.
We offer seamless tubes in grades 304, 304L, 316, 316L, 321, 347, and 904L in a wide range of sizes, wall thicknesses, and specifications. They are widely used in heat exchangers, condensers, instrumentation systems, hydraulic equipment, boilers, chemical processing plants, pharmaceutical facilities, food processing units, and power generation industries.
All products are manufactured and supplied in accordance with international ASTM, ASME, and ANSI standards. Each tube undergoes stringent quality inspections to ensure dimensional accuracy, excellent surface finish, corrosion resistance, high tensile strength, and long service life.
With ready stock, competitive pricing, prompt delivery, and a commitment to customer satisfaction, Kamal Steels has been serving industrial and engineering customers across India and global markets since 1984.
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Stainless Steel Seamless Tube Specifications
| Product | Stainless Steel Seamless Tubes |
|---|---|
| Brand | Kamal Steels |
| Material | Stainless Steel |
| Manufacturing Process | Seamless (Hot Finished / Cold Drawn) |
| 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 25 mm |
| Length | Single Random, Double Random, 6 Meter & Cut Length |
| Tube Ends | Plain End, Beveled End |
| Surface Finish | Annealed, Pickled, Bright Annealed (BA), Polished |
| Standards | ASTM A213, ASTM A269, ASME SA213, ASME SA269 |
| Testing | PMI, Hydrostatic, Eddy Current, Flattening, Flaring & Third-Party Inspection |
| Applications | Heat Exchangers, Boilers, Condensers, Instrumentation, Chemical Processing & Food Industries |
Stainless Steel Seamless Tube Size Chart
The following chart shows the standard outside diameter (OD) sizes available for stainless steel seamless tubes manufactured according to ASTM A213 and ASTM A269 specifications.
| Nominal Size | Outside Diameter (OD) mm | Outside Diameter (OD) Inch |
|---|---|---|
| 1/8" | 6.35 | 0.250 |
| 1/4" | 9.53 | 0.375 |
| 3/8" | 12.70 | 0.500 |
| 1/2" | 15.88 | 0.625 |
| 5/8" | 19.05 | 0.750 |
| 3/4" | 22.23 | 0.875 |
| 1" | 25.40 | 1.000 |
| 1 1/4" | 31.75 | 1.250 |
| 1 1/2" | 38.10 | 1.500 |
| 2" | 50.80 | 2.000 |
| 2 1/2" | 63.50 | 2.500 |
| 3" | 76.20 | 3.000 |
| 3 1/2" | 88.90 | 3.500 |
| 4" | 101.60 | 4.000 |
| 5" | 127.00 | 5.000 |
| 6" | 152.40 | 6.000 |
| 8" | 203.20 | 8.000 |
Stainless Steel Seamless Tube Weight Chart
The following table shows the approximate weight per metre of stainless steel seamless tubes based on outside diameter and wall thickness.
| NPS (Inch) | OD (mm) | SCH 5S kg/m |
SCH 10S kg/m |
SCH 40S kg/m |
SCH 80S kg/m |
|---|---|---|---|---|---|
| 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 |
Stainless Steel Seamless Tube Wall Thickness Chart
The following chart shows the standard wall thickness range available for stainless steel seamless tubes manufactured according to ASTM A213 and ASTM A269 specifications.
| Outside Diameter (OD) mm | Outside Diameter (OD) Inch | Standard Wall Thickness (mm) | Standard Wall Thickness (Inch) |
|---|---|---|---|
| 6.35 | 1/4" | 0.89 | 0.035" |
| 9.53 | 3/8" | 0.89 - 1.24 | 0.035" - 0.049" |
| 12.70 | 1/2" | 0.89 - 1.65 | 0.035" - 0.065" |
| 15.88 | 5/8" | 1.24 - 2.11 | 0.049" - 0.083" |
| 19.05 | 3/4" | 1.24 - 2.11 | 0.049" - 0.083" |
| 22.23 | 7/8" | 1.24 - 2.77 | 0.049" - 0.109" |
| 25.40 | 1" | 1.65 - 3.05 | 0.065" - 0.120" |
| 31.75 | 1 1/4" | 1.65 - 3.56 | 0.065" - 0.140" |
| 38.10 | 1 1/2" | 1.65 - 3.68 | 0.065" - 0.145" |
| 50.80 | 2" | 2.11 - 5.54 | 0.083" - 0.218" |
| 63.50 | 2 1/2" | 2.11 - 5.54 | 0.083" - 0.218" |
| 76.20 | 3" | 2.11 - 7.01 | 0.083" - 0.276" |
| 88.90 | 3 1/2" | 2.77 - 7.62 | 0.109" - 0.300" |
| 101.60 | 4" | 2.77 - 8.56 | 0.109" - 0.337" |
| 114.30 | 4 1/2" | 3.05 - 8.56 | 0.120" - 0.337" |
| 141.30 | 5 1/2" | 3.40 - 9.53 | 0.134" - 0.375" |
| 168.30 | 6" | 3.40 - 10.97 | 0.134" - 0.432" |
| 219.10 | 8" | 3.76 - 12.70 | 0.148" - 0.500" |
Stainless Steel Seamless Tube Dimensions Chart
The following chart provides the standard dimensions of stainless steel seamless tubes, including outside diameter, inside diameter and wall thickness. Actual dimensions may vary depending on the applicable ASTM specification and manufacturing tolerance.
| Outside Diameter (OD) mm | Wall Thickness (mm) | Inside Diameter (ID) mm | Standard Length |
|---|---|---|---|
| 6.35 | 0.89 | 4.57 | 6 m / Custom |
| 9.53 | 1.24 | 7.05 | 6 m / Custom |
| 12.70 | 1.24 | 10.22 | 6 m / Custom |
| 15.88 | 1.65 | 12.58 | 6 m / Custom |
| 19.05 | 1.65 | 15.75 | 6 m / Custom |
| 22.23 | 2.11 | 18.01 | 6 m / Custom |
| 25.40 | 2.11 | 21.18 | 6 m / Custom |
| 31.75 | 2.77 | 26.21 | 6 m / Custom |
| 38.10 | 2.77 | 32.56 | 6 m / Custom |
| 50.80 | 3.05 | 44.70 | 6 m / Custom |
| 63.50 | 3.40 | 56.70 | 6 m / Custom |
| 76.20 | 3.40 | 69.40 | 6 m / Custom |
| 88.90 | 3.76 | 81.38 | 6 m / Custom |
| 101.60 | 4.19 | 93.22 | 6 m / Custom |
| 114.30 | 4.57 | 105.16 | 6 m / Custom |
| 141.30 | 4.78 | 131.74 | 6 m / Custom |
| 168.30 | 5.54 | 157.22 | 6 m / Custom |
| 219.10 | 6.35 | 206.40 | 6 m / Custom |
Chemical Composition of Stainless Steel Seamless Tubes
| Grade | Carbon (%) | Chromium (%) | Nickel (%) | Molybdenum (%) |
|---|---|---|---|---|
| 304 | 0.08 Max | 18.0–20.0 | 8.0–10.5 | — |
| 304L | 0.03 Max | 18.0–20.0 | 8.0–12.0 | — |
| 316 | 0.08 Max | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
| 316L | 0.03 Max | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
| 321 | 0.08 Max | 17.0–19.0 | 9.0–12.0 | — |
| 347 | 0.08 Max | 17.0–19.0 | 9.0–13.0 | — |
| 310S | 0.08 Max | 24.0–26.0 | 19.0–22.0 | — |
| 904L | 0.02 Max | 19.0–23.0 | 23.0–28.0 | 4.0–5.0 |
Mechanical Properties of Stainless Steel Seamless Tubes
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB Max) |
|---|---|---|---|---|
| 304 / 304L | 515 | 205 | 35 | 201 |
| 316 / 316L | 515 | 205 | 35 | 217 |
| 321 | 515 | 205 | 35 | 217 |
| 347 | 515 | 205 | 35 | 201 |
| 310S | 515 | 205 | 40 | 217 |
| 904L | 490 | 220 | 35 | 190 |
Grades of Stainless Steel Seamless Tubes
Kamal Steels manufactures the following grades of stainless steel seamless tubes:
- Stainless Steel 304 Seamless Tubes
- Stainless Steel 304H Seamless Tubes
- Stainless Steel 304L Seamless Tubes
- Stainless Steel 310 Seamless Tubes
- Stainless Steel 310S Seamless Tubes
- Stainless Steel 310H Seamless Tubes
- Stainless Steel 316 Seamless Tubes
- Stainless Steel 316L Seamless Tubes
- Stainless Steel 316H Seamless Tubes
Surface Finish of Stainless Steel Seamless Tubes
| Surface Finish | Description | Typical Applications |
|---|---|---|
| Annealed & Pickled (AP) | Heat treated and acid cleaned | Chemical, Petrochemical |
| Bright Annealed (BA) | Smooth, bright reflective finish | Food, Pharmaceutical, Instrumentation |
| Polished 180 Grit | Uniform satin finish | Architectural, Decorative |
| Polished 240 Grit | Fine smooth finish | Process Equipment |
| Polished 320 Grit | Fine polished appearance | Medical & Food Processing |
| Mirror Finish (600 Grit) | Highly reflective finish | Decorative & Premium Applications |
Features of Stainless Steel Seamless Tubes
- Excellent corrosion and oxidation resistance
- Seamless construction for superior strength and reliability
- High dimensional accuracy with tight tolerances
- Smooth inner and outer surface finish
- Suitable for high-pressure and high-temperature service
- Available in a wide range of sizes, wall thicknesses, and grades
- Excellent weldability, formability, and machinability
- Ideal for heat exchangers, instrumentation, condensers, and process equipment
Applications of Stainless Steel Seamless Tubes
Seamless Stainless Tubes are widely used in industries requiring high Rust Resistance, accurate sizing and reliable pressure handling performance.
Oil & Gas Industry
Used for fluid transportation, instrumentation systems and high-pressure applications in offshore and onshore operations.
Chemical Processing Plants
Suitable for handling corrosive chemicals, acids and industrial process fluids safely.
Heat Exchanger Systems
Widely used in heat exchangers and condensers because of their temperature resistance and smooth internal finish.
Power Generation Plants
Applied in steam pipelines, boilers and thermal power systems operating under high pressure and temperature.
Pharmaceutical Industry
Preferred for hygienic and contamination-free fluid transfer applications in pharmaceutical manufacturing.
Food & Beverage Industry
Used in sanitary processing systems requiring corrosion-resistant and clean tubing surfaces.
Water Treatment Plants
Suitable for desalination, filtration and water purification systems because of corrosion-resistant properties.
Aerospace Industry
Used in aerospace tubing systems where strength, reliability and lightweight performance are important.
Marine Industry
Marine applications require durable and corrosion-resistant tubing systems capable of handling seawater exposure.
General Engineering
Widely used in industrial fabrication, instrumentation and mechanical engineering applications.
Industries We Serve
Kamal Steels supplies stainless steel seamless tubes to various industries worldwide for precision tubing and corrosion-resistant applications.
Petrochemical Industry
Our seamless tubes are widely used in petrochemical processing systems operating under harsh conditions.
Chemical Industry
Chemical plants use Seamless Stainless Tubes for safe handling of corrosive fluids and chemicals.
Energy & Power Industry
Used in boilers, condensers and thermal systems requiring reliable high-temperature tubing solutions.
Pharmaceutical Industry
Pharmaceutical plants require hygienic and precision tubing systems for clean process operations.
Offshore & Marine Industry
Marine environments require corrosion-resistant seamless tubes for seawater and offshore systems.
Engineering Industry
Engineering sectors use SS Seamless Tubes for fabrication, instrumentation and mechanical systems.
Automobile Industry
Used in automotive exhaust, fuel and hydraulic systems requiring durable tubing solutions.
Frequently Asked Questions
A stainless steel seamless tube is manufactured without any welded joint. It is produced from a solid stainless steel billet through piercing and rolling processes, providing Enhanced Mechanical Strength, excellent pressure resistance and consistent performance in critical industrial applications.
Stainless steel seamless tubes are available in various grades including SS 304, SS 304L, SS 316, SS 316L, SS 321, SS 347, SS 310S and SS 904L. The choice of grade depends on the application, operating temperature and corrosion environment.
Stainless steel seamless tubes are commonly manufactured according to ASTM A213, ASTM A269, ASTM A249, ASME SA213 and ASME SA269 standards to ensure dimensional accuracy, mechanical strength and chemical resistance.
Seamless tubes are manufactured without a welded seam, offering higher pressure resistance, better structural integrity and improved reliability. Welded tubes are produced by welding steel strips and are generally used in less demanding applications.
Stainless steel seamless tubes are widely used in heat exchangers, condensers, boilers, hydraulic systems, instrumentation lines, chemical processing plants, pharmaceutical industries, food processing units, power plants and oil & gas facilities.
Stainless steel seamless tubes are available in outside diameters ranging from 6 mm to 219 mm, with wall thicknesses from 0.5 mm to 25 mm. Custom sizes and cut lengths can also be supplied based on project requirements.
SS 316 and SS 316L are commonly recommended for corrosive environments due to their molybdenum content, which improves resistance to chemicals, chlorides and seawater. For highly aggressive conditions, SS 904L may be preferred.
Stainless steel seamless tubes undergo Hydrostatic Testing, Ultrasonic Testing (UT), Eddy Current Testing (ET), PMI Testing, Flattening Tests, Flaring Tests, Chemical Analysis, Mechanical Testing and Dimensional Inspection to ensure product quality and compliance.
Yes, stainless steel seamless tubes are supplied with Mill Test Certificates (MTC) that verify chemical composition, mechanical properties and compliance with relevant ASTM and ASME standards.
The price of stainless steel seamless tubes depends on the grade, size, wall thickness, quantity, testing requirements and delivery location. Contact our sales team with your specifications to receive the latest pricing, stock availability and delivery schedule.