Home > Seamless Tube > Carbon Steel Seamless Tubes
Inox Steel India supplies a complete range of Carbon Steel Seamless Tubes manufactured as per ASTM A210, ASTM A179, and DIN 2391 ST35/ST52. These tubes are widely used in high-temperature, high-pressure, and precision engineering environments where reliability, strength, and exact dimensional control are essential.
Carbon steel seamless tubes remain the industry’s preferred choice for:
Manufactured using hot-finished, cold-drawn (CDS), pilgered, and normalized processes, our carbon steel seamless tubes deliver uniform mechanical properties, excellent wall thickness accuracy, and stable performance under cyclic loading and pressure variations.
Available grades include:
These tubes are supplied in black, phosphated, oiled, or annealed condition based on the application.
Inox Steel India is a trusted supplier for high-pressure boiler manufacturers, EPC contractors, OEMs, automotive tier-1 suppliers, hydraulic equipment makers, and industrial fabricators across India, GCC, Africa, Europe, and Southeast Asia. Every tube is manufactured to meet tight tolerances, high cleanliness standards, and strict metallurgical quality benchmarks.
Carbon Steel Seamless Tubes are preferred where high pressure, high temperature, mechanical strength, and precise dimensional tolerances are essential. The absence of a weld seam makes them ideal for continuous heat transfer, pressurized circuits, and mechanical load-bearing operations.
1. Boiler & Superheater Tubes
Designed for high-temperature and high-pressure stability.
Applications:
Preferred Grades: ASTM A210 Gr A1 / C
2. Heat Exchanger & Condenser Tubes
Low carbon content provides excellent heat transfer efficiency.
Used In:
Preferred Grade: ASTM A179
3. Hydraulic & Pneumatic Tubing
DIN 2391 cold-drawn tubes provide superior ID smoothness and high yield strength.
Applications:
Preferred Grades: ST35 / ST52
4. Mechanical & Automotive Tubing
High fatigue strength makes these tubes ideal for precision mechanical systems.
Applications:
Preferred Grades: DIN 2391 ST52 (CDS)
5. Air Heaters & Economizers
Designed for temperature fluctuations and extended heating cycles.
Used For:
Preferred Grades: A210 / A179
| Parameter | Carbon Steel Seamless Tubes |
|---|---|
| Applicable Standards | ASTM A210 • ASTM A179 • DIN 2391 ST35/ST52 • EN 10305-1 • ASTM A519 |
| Grades Available | ASTM A210 Gr A1, C • ASTM A179 • DIN 2391 ST35 • DIN 2391 ST52 |
| Manufacturing Process | Cold Drawn Seamless (CDS) • Hot Finished Seamless (HFS) • Normalized • Stress Relieved |
| Size Range (OD) | 6 mm to 219 mm OD |
| Thickness Range | 0.8 mm to 20 mm |
| Length Options | 6m • 12m • Custom Cut Lengths • U-bent (on request) |
| Mechanical Properties | Tensile: 325–520 MPa • Yield: 180–355 MPa • Elongation: 30–45% (depends on grade) |
| Surface Finish | Black • Phosphated • Annealed • Oiled • Clean ID tubes for heat exchangers |
| Heat Treatment | Annealed • Normalized • Stress Relieved • Cold Drawn Bright Annealed (CD+SR) |
| Dimensional Tolerances | As per ASTM A179/A210/DIN 2391 — tight tolerances for OD, WT, concentricity & straightness |
| End Finish | Plain End • Bevel End • Deburred Ends |
| Testing (Mandatory) | Hydrostatic Test • Eddy Current Test • Mechanical Testing • Hardness • Flattening/Flaring |
| Optional Testing | UT (Ultrasonic) • PMI • IGC • Hardness Mapping • Charpy Impact Test |
| NDT Compliance | EC / Hydro / UT based on requirement & standard |
| Documentation | MTC EN 10204 3.1 • Hydro/NDT Reports • Chemical & Mechanical Reports |
| Corrosion Resistance | Suitable for low-to-medium corrosive environments; depends on coating/oiling |
| Typical Applications | Boilers • Heat Exchangers • Condensers • Hydraulic Systems • Precision Tubing • Mechanical Engineering • Automotive Systems • Air Preheaters |
| Key Grade Benefits | A179: Low-carbon for excellent heat transfer • A210: High-pressure boiler use • ST35/ST52: Precision + high strength mechanical tubing |
| Application | Recommended Grade | Why |
|---|---|---|
| Heat exchangers & condensers | ASTM A179 | Low carbon → excellent heat transfer |
| Boilers & high-pressure systems | ASTM A210 Gr A1/C | Higher strength for pressure cycles |
| Hydraulics & automotive | DIN 2391 ST35 | Clean ID + precision tolerances |
| Heavy mechanical components | DIN 2391 ST52 | High yield strength & machinability |
| General engineering | A179 / ST35 | Economical + versatile |
| Tube Type | OD Range | WT Range | Typical Use |
|---|---|---|---|
| A179 Heat Exchanger Tubes | 6.35 mm – 63.5 mm | 0.8 mm – 5 mm | HX & condensers |
| A210 Boiler Tubes | 19.05 mm – 76.2 mm | 2 mm – 12 mm | Boilers & superheaters |
| DIN 2391 ST35/ST52 CDS Tubes | 4 mm – 120 mm | 0.8 mm – 12.5 mm | Hydraulics & automotive |
| Mechanical Tubing (A519/DIN) | Custom | Custom | Machined components |
| Grade | Price Range (₹/kg) | Notes |
|---|---|---|
| ASTM A179 | ₹95 – ₹145 | Heat exchanger tubes |
| ASTM A210 Gr A1/C | ₹110 – ₹165 | Boiler & pressure tubes |
| DIN 2391 ST35 | ₹105 – ₹150 | Hydraulic & general engineering |
| DIN 2391 ST52 | ₹125 – ₹180 | High-strength mechanical tubing |
Prices vary by OD, WT, heat treatment, and order quantity.
Every carbon steel seamless tube undergoes strict dimensional and performance checks.
Mandatory Tests
Optional Tests (Project-Based)
Documentation Provided
Inox Steel India is a trusted supplier of Carbon Steel Seamless Tubes for high-pressure, high-temperature, and precision engineering applications. Our tubes are manufactured with strict metallurgical control, ensuring consistent strength, clean internal surfaces, and exceptional dimensional accuracy.
Key Performance Advantages
We support high-demand projects by maintaining strong supply chain capabilities and reliable dispatch timelines.
| Industry | Applications |
|---|---|
| Power Plants | Boilers, superheaters, economizers |
| Petrochemical & Refinery | Air heaters, condensers, process loops |
| Automotive & Mobility | Fuel lines, brake lines, structural components |
| Hydraulic Systems | Cylinder tubes, precision control lines |
| Mechanical Engineering | Axles, machined parts, load-bearing tubes |
| OEM Manufacturing | Heat exchangers, cooling systems, pressure vessels |
| Fertilizer & Chemical Plants | Process tube bundles & cooling coils |
Our tubes are supplied to major EPC contractors, boiler manufacturers, automotive OEMs, hydraulic equipment makers, and global engineering firms.
We ship carbon steel seamless tubes to 35+ countries, ensuring safe handling and international compliance.
Export Packaging Includes:
Major Export Markets:
UAE • Saudi Arabia • Kuwait • Qatar • Oman • Egypt • South Africa
Kenya • Nigeria • Turkey • Europe • Bangladesh • Vietnam • Indonesia
All shipments include complete documentation and quality certification.
We provide:
✔ Material recommendations based on service temperature/pressure
✔ Guidance for boiler, heat exchanger & hydraulic system design
✔ Third-party inspection support
✔ Fast quotes for small and bulk orders
✔ Quick delivery for urgent shutdown requirements
Request datasheets, size charts, and sample tubes.
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
alloy@inoxsteelindia.in
+91 9930796690
Inox Steel India supplies carbon steel seamless tubes in grades ASTM A210, A179 and DIN 2391 ST35/ST52 for boilers, heat exchangers, condensers, hydraulics and mechanical engineering. Precision cold-drawn & hot-finished tubes with complete MTC 3.1.