Stainless Steel Welded Tubes Manufacturer in India
Carbon Steel Welded Tubes Manufacturer in India
Sachiya Steel International is a trusted Carbon Steel Welded Tubes Manufacturer in India, supplying welded tubes for heat exchangers, low-pressure boilers, machinery, structural applications, automotive components, and general engineering. We manufacture round, square, and rectangular tubes from 1/4″ to 6″ OD and supply them to standards such as ASTM A178, A214, A513, A500, EN 10305-2, EN 10219, and JIS G3445. Different grades, wall thicknesses, sizes, and finishes are available to meet specific application requirements.
Our capabilities include drawing, cutting, bending, testing, and end finishing, with suitable packing and documentation for domestic and international orders. We provide EN 10204 3.1 certificates, inspection reports, and test records where required. Supported by ISO 9001:2015 and PED 2014/68/EU certifications, we supply welded tubes to customers across 85+ countries, handling both regular and project-based requirements.
What Are Carbon Steel Welded Tubes?
Carbon steel welded tubes are hollow tubes made from flat carbon steel strip that the mill rolls into a round and welds along the seam. The mill slits a coil to the exact strip width, curls it through forming rolls, and heats the two edges with high-frequency current. Rollers squeeze the hot edges together, and they fuse without any filler metal. A cutter then trims the weld bead from the outside, and for many tubes, from the inside as well. Heat treatment of the seam follows, sizing rolls bring the tube to size, and a probe scans the weld along its whole length before the tube is cut.
Because the strip comes from a rolling mill with a very even thickness, welded tubes hold a very consistent wall. Because the process runs continuously, the mill can make long lengths with little scrap. The result is a tube that costs far less than a seamless one, which is why Indian buyers also call these tubes MS tubes, ERW tubes, or CRC tubes when the steel is cold rolled.
Carbon Steel Welded Tubes
High-quality Carbon Steel Welded Tubes manufactured for demanding applications across automotive, engineering, construction, boiler, heat exchanger and industrial sectors. Available in round, square and rectangular profiles, with multiple grades, sizes, wall thicknesses and manufacturing specifications.
Types of Carbon Steel Welded Tubes
Carbon steel welded tubes are available in different shapes and manufacturing forms to suit applications ranging from machinery and fabrication to structural and industrial work. The right tube depends on factors such as its shape, dimensions, wall thickness, tolerance, and the conditions in which it will be used.
- ERW Tubes: Made by forming steel strip and joining the edges through electrical resistance welding. They are commonly used for machinery, fabrication, and structural applications.
- Cold Drawn Welded Tubes: Drawn after welding to improve dimensional accuracy and surface finish, making them suitable for precision applications.
- Round Tubes: Used in heat transfer equipment, automotive components, machinery, and general engineering.
- Square Tubes: Suitable for frames, supports, structures, and fabricated equipment.
- Rectangular Tubes: Used for machine frames, structural sections, trailers, and fabrication projects.
- Precision Welded Tubes: Manufactured with controlled dimensions and tolerances for applications where consistent sizing is important.
With experience as a Carbon Steel Welded Tubes Manufacturer, we produce different tube shapes, grades, sizes, wall thicknesses, and finishes to meet specific project and application requirements.
Types of Pipes & Tubes
Explore our range of industrial pipes and tubes, manufactured for different applications, materials, specifications and engineering requirements.
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→Get Certified Carbon Steel Welded Tubes at Competitive Factory Prices
Carbon Steel Welded Tubes Specification
| Parameter | Details |
|---|---|
| Size Range | 1/4" to 6" OD (6.35 mm to 152.4 mm) round; 20 × 20 mm to 100 × 100 mm square and rectangular |
| Wall Thickness | 0.71 mm (22 BWG) to 6.35 mm |
| Process | High-frequency ERW, cold drawn welded (DOM), sink drawn |
| Grades | ASTM A178 Gr. A / C / D, A214, A513 1010 / 1020 / 1026 / 1045, A500 Gr. B / C, EN 10305-2 E195 / E235 / E355, JIS G3445 STKM |
| Delivery Condition | As welded, stress relieved, normalized, cold drawn hard, annealed |
| Shapes | Round, square, rectangular, oval |
| Length | 6 m, 9 m, 12 m, random, exact cut lengths |
| Fabrication | U-bending, end forming, flaring, cutting to length |
| Surface Finish | Black, oiled, phosphated, varnished, galvanized |
| Testing | Eddy current weld test, hydrostatic, flattening, flaring, reverse flattening, tensile, hardness |
| Certificate | EN 10204 3.1 (3.2 on request) |
Carbon Steel Welded Tube Standards and Specifications
| Use | Standard |
|---|---|
| Boiler and Superheater Tubes | ASTM A178 / ASME SA178 |
| Heat Exchanger and Condenser Tubes | ASTM A214 / ASME SA214 |
| Mechanical Tubing | ASTM A513 / ASME SA513 |
| Structural Tubing | ASTM A500, EN 10219, IS 4923 |
| Precision Welded Tubes (Cold Drawn) | EN 10305-2 |
| Precision Welded Tubes (Cold Sized) | EN 10305-3, DIN 2393 |
| Pressure Tubes | EN 10217-1 |
| Mechanical and General Engineering Tubes | EN 10296-1, IS 3601 |
| Japanese Standards | JIS G3445 (STKM), JIS G3444 (STK) |
| Indian Standards | IS 1161, IS 1239 |
| General Requirements | ASTM A450 |
| Boiler and Pressure Vessel Code | ASME Section I, II, VIII |
| Certificate | EN 10204 3.1 and 3.2 |
Carbon Steel Welded Tubes Material and Grades
| Duty | Grades | UNS / Material No. | Standard |
|---|---|---|---|
| Boiler and Superheater | A178 Gr. A / C / D | K01200 / K03503 / K02709 | ASTM A178 |
| Heat Exchanger and Condenser | A214 | K01807 | ASTM A214 |
| Mechanical Tubing | 1010 / 1020 / 1026 / 1045 | G10100 / G10200 / G10260 / G10450 | ASTM A513 |
| Structural Tubing | Gr. B / Gr. C | – | ASTM A500 |
| European Precision Tubes | E195 / E235 / E355 | 1.0034 / 1.0308 / 1.0580 | EN 10305-2 |
| European Pressure Tubes | P235TR2 / P265TR2 | 1.0255 / 1.0259 | EN 10217-1 |
| Japanese Mechanical Tubes | STKM 11A / STKM 13A | – | JIS G3445 |
Carbon Steel ERW Tubes, Cold Drawn Welded Tubes, Boiler Tubes, Heat Exchanger Tubes, Mechanical Tubes, Square and Rectangular Tubes, Carbon Steel Welded Tubes Manufacturers and Suppliers in India
We manufacture and supply carbon steel welded tubes for fabrication, boilers, heat exchangers, machinery, automotive, structural, and engineering applications. Our range includes ASTM A214 heat exchanger tubes, ASTM A178 boiler tubes, cold drawn welded tubes to EN 10305-2 and ASTM A513, and square and rectangular tubes to ASTM A500 and EN 10219. These tubes are available in different sizes, wall thicknesses, grades, and finishes to suit specific equipment and project requirements.
With established capabilities as a Carbon Steel Welded Tubes Manufacturer in India, we support standard and custom requirements with services such as cutting, bending, oiling, and end capping. Tubes can be supplied with heat numbers, test records, and suitable surface protection based on storage, handling, and service conditions. This allows us to support both regular supply requirements and project-specific orders.
What Is the Difference Between As-Welded and Cold Drawn Welded Carbon Steel Tubes?
Both start as a welded tube, but cold drawn welded tubes get one more step. The mill pulls the welded tube through a die, over a mandrel inside, at room temperature. That pull compresses the weld, removes the inside bead, tightens the outside diameter and wall, and raises the strength. As-welded tubes skip this step, so they cost less and suit jobs where an exact bore does not matter.
Choose as-welded tubes for frames, supports, low-pressure lines, and general fabrication. Choose cold drawn welded tubes for cylinders, bearings, hydraulic parts, and any job that needs a smooth bore and tight size.
| Point | As-Welded Tubes | Cold Drawn Welded (DOM) Tubes |
|---|---|---|
| Final Sizing | Sizing rolls after welding | Drawn through a die over a mandrel |
| OD and Wall Tolerance | Standard | Tight |
| Inside Weld Bead | Trimmed or left | Removed and compressed |
| Surface | Smooth, matt | Very smooth, clean, often bright |
| Strength | Standard for the grade | Higher, adjustable by heat treatment |
| Concentricity | Good | Excellent |
| Wall Range | Medium to heavy | Thin to medium |
| Price | Lower | Higher |
| Typical Standards | ASTM A500, A178, EN 10219 | ASTM A513, EN 10305-2, JIS G3445 |
| Best For | Frames, supports, boilers, low-pressure lines | Hydraulic cylinders, bearings, rollers, automotive parts |
Carbon Steel Welded Tubes Chemical Composition
Chemistry controls strength, weldability, and bendability. Values are weight percent, maximum unless a range shows.
ASTM A178, A214, A500 and A513 Welded Tubes
| Grade | C | Mn | Si | P | S | Other |
|---|---|---|---|---|---|---|
| A178 Gr. A | 0.06–0.18 | 0.27–0.63 | – | 0.035 | 0.035 | – |
| A178 Gr. C | 0.35 | 0.80 | – | 0.035 | 0.035 | – |
| A178 Gr. D | 0.27 | 1.00 | 0.10 min | 0.035 | 0.035 | – |
| A214 | 0.18 | 0.27–0.63 | – | 0.035 | 0.035 | – |
| A500 Gr. B | 0.26 | – | – | 0.035 | 0.035 | Cu 0.20 min (if specified) |
| A500 Gr. C | 0.23 | 1.35 | – | 0.035 | 0.035 | Cu 0.20 min (if specified) |
| A513 1010 | 0.08–0.13 | 0.30–0.60 | – | 0.040 | 0.050 | – |
| A513 1020 | 0.18–0.23 | 0.30–0.60 | – | 0.040 | 0.050 | – |
| A513 1026 | 0.22–0.28 | 0.60–0.90 | – | 0.040 | 0.050 | – |
| A513 1045 | 0.43–0.50 | 0.60–0.90 | – | 0.040 | 0.050 | – |
European and Japanese Welded Tubes
| Grade | C | Si | Mn | P | S |
|---|---|---|---|---|---|
| EN 10305-2 E195 | 0.15 | 0.35 | 0.70 | 0.025 | 0.025 |
| EN 10305-2 E235 | 0.17 | 0.35 | 1.20 | 0.025 | 0.025 |
| EN 10305-2 E355 | 0.22 | 0.55 | 1.60 | 0.025 | 0.025 |
| EN 10217-1 P235TR2 | 0.16 | 0.35 | 1.20 | 0.025 | 0.020 |
| EN 10217-1 P265TR2 | 0.20 | 0.40 | 1.40 | 0.025 | 0.020 |
| JIS STKM 11A | 0.12 | 0.35 | 0.60 | 0.040 | 0.040 |
| JIS STKM 13A | 0.25 | 0.35 | 0.30–0.90 | 0.040 | 0.040 |
Carbon Steel Welded Tubes Mechanical Properties
Mechanical properties show how much load the tube carries before it stretches (yield) or breaks (tensile). Values are minimum unless marked max.
| Grade | Tensile Strength ksi (MPa) | Yield Strength ksi (MPa) | Elongation % | Hardness (max) |
|---|---|---|---|---|
| A178 Gr. A | 47 (325) | 26 (180) | 35 | 77 HRB |
| A178 Gr. C | 60 (415) | 37 (255) | 30 | – |
| A178 Gr. D | 70 (485) | 40 (275) | 30 | – |
| A214 | 47 (325) | 26 (180) | 35 | 72 HRB |
| A500 Gr. B (round) | 58 (400) | 42 (290) | 23 | – |
| A500 Gr. C (round) | 62 (425) | 46 (317) | 21 | – |
| EN 10305-2 E235+N | 49–70 (340–480) | 34 (235) | 25 | – |
| EN 10305-2 E355+N | 71–91 (490–630) | 51.5 (355) | 22 | – |
| JIS STKM 11A | 42 (290) | – | 35 | – |
| JIS STKM 13A | 54 (370) | 31 (215) | 30 | – |
ASTM A513 and the cold drawn conditions of EN 10305-2 get their strength from the condition you order, such as as-welded, stress relieved, or drawn over mandrel, so the mill test certificate lists the exact values.
Carbon Steel Welded Tube Size and Weight Chart
Tubes are ordered by outside diameter and wall thickness. The first chart gives weight in kg per metre, kg per 6 m length, and metres per tonne for popular round sizes. The second gives kg per metre for rectangular tubes.
Round Welded Tubes
| OD in | OD mm | Wall | kg per Metre | kg per 6 m Length | Metres per Tonne |
|---|---|---|---|---|---|
| 1/2" | 12.70 | 18 BWG (1.24 mm) | 0.350 | 2.10 | 2,854 |
| 1/2" | 12.70 | 16 BWG (1.65 mm) | 0.450 | 2.70 | 2,224 |
| 5/8" | 15.88 | 18 BWG (1.24 mm) | 0.448 | 2.69 | 2,234 |
| 5/8" | 15.88 | 16 BWG (1.65 mm) | 0.579 | 3.47 | 1,727 |
| 3/4" | 19.05 | 18 BWG (1.24 mm) | 0.545 | 3.27 | 1,836 |
| 3/4" | 19.05 | 16 BWG (1.65 mm) | 0.708 | 4.25 | 1,412 |
| 3/4" | 19.05 | 14 BWG (2.11 mm) | 0.881 | 5.29 | 1,135 |
| 1" | 25.40 | 16 BWG (1.65 mm) | 0.966 | 5.80 | 1,035 |
| 1" | 25.40 | 14 BWG (2.11 mm) | 1.212 | 7.27 | 825 |
| 1" | 25.40 | 12 BWG (2.77 mm) | 1.546 | 9.27 | 647 |
| 1-1/4" | 31.75 | 16 BWG (1.65 mm) | 1.225 | 7.35 | 816 |
| 1-1/4" | 31.75 | 14 BWG (2.11 mm) | 1.542 | 9.25 | 648 |
| 1-1/2" | 38.10 | 14 BWG (2.11 mm) | 1.873 | 11.24 | 534 |
| 1-1/2" | 38.10 | 12 BWG (2.77 mm) | 2.413 | 14.48 | 414 |
| 2" | 50.80 | 14 BWG (2.11 mm) | 2.533 | 15.20 | 395 |
| 2" | 50.80 | 12 BWG (2.77 mm) | 3.281 | 19.69 | 305 |
| 2-1/2" | 63.50 | 12 BWG (2.77 mm) | 4.148 | 24.89 | 241 |
| 3" | 76.20 | 12 BWG (2.77 mm) | 5.016 | 30.10 | 199 |
To work out the weight of any round size, use Weight (kg/m) = (OD − Wall) × Wall × 0.02466, with both values in mm.
Rectangular Welded Tubes, Approximate Weight in kg per Metre
| Size mm | 1.5 mm Wall | 2.0 mm Wall | 2.5 mm Wall | 3.0 mm Wall | 4.0 mm Wall | 5.0 mm Wall |
|---|---|---|---|---|---|---|
| 40 × 20 | 1.34 | 1.76 | 2.16 | 2.54 | – | – |
| 50 × 25 | 1.70 | 2.23 | 2.75 | 3.25 | 4.21 | – |
| 60 × 40 | 2.28 | 3.01 | 3.73 | 4.43 | 5.78 | 7.07 |
| 80 × 40 | – | 3.64 | 4.51 | 5.37 | 7.03 | 8.64 |
| 100 × 50 | – | – | 5.69 | 6.78 | 8.92 | 10.99 |
| 120 × 60 | – | – | – | 8.20 | 10.80 | 13.35 |
Rectangular tube weight uses Weight (kg/m) = 0.00785 × 2 × Wall × (Side A + Side B − 2 × Wall), with values in mm. The result ignores corner radii, so real weights run slightly lower.
Available Sizes, Dimensions and Tolerances
We supply carbon steel welded tubes from 1/4" to 6" OD, in walls from 22 BWG (0.71 mm) to 6.35 mm, and in square and rectangular sections from 20 × 20 mm to 100 × 100 mm. Tubes do not use schedule numbers. You give the outside diameter and the wall thickness, and the standard sets how far each can vary. BWG is the gauge number for wall thickness, and a lower BWG means a thicker wall. Cold drawn welded tubes hold a much smaller size variation than as-welded tubes, so ask for the tolerance class when it matters to your fit.
Standard lengths are 6 m, 9 m, and 12 m, plus random lengths and exact cut lengths. As a carbon steel welded tubes supplier in India, we hold the common sizes in stock, subject to availability.
| Product | Available Sizes | Wall Thickness | Standard Lengths |
|---|---|---|---|
| ERW Round Tubes | 1/4" to 6" OD | 22 BWG to 6.35 mm | 6 m / 9 m / 12 m / exact cut |
| Cold Drawn Welded (DOM) Tubes | 6 mm to 76 mm OD | 1.0 mm to 5 mm | 6 m / exact cut |
| Boiler and Heat Exchanger Tubes | 1/2" to 4" OD | 16 BWG to 10 BWG | 6 m / 9 m / 12 m / exact cut |
| Square and Rectangular Tubes | 20 × 20 mm to 100 × 100 mm | 1.5 mm to 5 mm | 6 m / 12 m / custom |
| U-Bend Tubes | 1/2" to 2" OD | 16 BWG to 10 BWG | Made to drawing |
Common Materials Used in Carbon Steel Welded Tubes
Carbon steel welded tubes use low- and medium-carbon steel strips, with different grades available for boiler, heat exchanger, mechanical, structural, and precision applications. The material selection depends on the required strength, temperature, pressure, and service conditions.
ASTM A178: Grades A, C, and D are used for boiler and superheater tubes.
ASTM A214: Covers welded tubes for heat exchangers and condensers.
ASTM A513: Common mechanical tubing grades include 1010, 1020, 1026, and 1045.
ASTM A500: Grades B and C are widely used for structural tubing.
EN 10305-2: Grades E195, E235, and E355 are used for precision applications.
EN 10217-1: Common grades include P235TR2 and P265TR2 for pressure applications.
JIS G3445: Mechanical tube grades include STKM 11A to STKM 13C.
For each order, we confirm the standard, grade, and delivery condition before production or supply. Our work as a Carbon Steel Welded Tubes Supplier includes matching the material specification with the intended application, whether the requirement calls for as-welded or cold-drawn tubes.
Carbon Steel Welded Tubes We Manufacture and Supply
Our range as a carbon steel welded tubes manufacturer covers ERW tubes, cold drawn welded tubes, DOM tubes, boiler tubes, heat exchanger tubes, condenser tubes, mechanical tubes, and structural tubes. We also supply square tubes, rectangular tubes, oval tubes, and hollow sections, plus hydraulic tubes for low-pressure service. They come black, oiled, phosphated, varnished, or galvanized, straight or bent, and with the markings, heat numbers, and test reports your standard requires.
Applications of Carbon Steel Welded Tubes
- Condensers and Heat Exchangers: Move heat between fluids in power, chemical, and HVAC systems.
- Low-Pressure Boilers and Air Heaters: Carry water, steam, and hot gas in industrial units.
- Automotive Parts: Form frames, steering columns, seat frames, and exhaust components.
- Bearings, Rollers, and Bushes: Make races, conveyor rollers, and machine sleeves.
- Hydraulic and Pneumatic Cylinders: Serve as cylinder barrels and low-pressure lines.
- Furniture, Fitness, and Appliances: Build frames, racks, and supports.
- Construction and Scaffolding: Make trusses, columns, handrails, and supports.
- Agricultural Equipment: Form implement frames and irrigation structures.
- Shipbuilding and Offshore: Carry low-pressure fluids and form structures.
Why Choose Us as Your Carbon Steel Welded Tubes Manufacturer in India?
With 20+ years of experience, we understand the practical requirements that come with welded tube orders. We can handle different grades, sizes, wall thicknesses, shapes, and standards for boiler, heat exchanger, mechanical, structural, and engineering applications. Our production and sourcing capabilities also allow us to manage both regular requirements and larger project orders, while services such as cutting, bending, drawing, oiling, and end finishing can be arranged when needed.
We focus on more than simply supplying the tube. Every order can include material testing, heat number identification, inspection reports, and required certificates for proper traceability. Customers working with us as a Carbon Steel Welded Tubes Supplier in India also benefit from our export experience, with supplies reaching 85+ countries and packing and shipping documents prepared according to the destination. This combination of product knowledge, quality control, documentation, and export support makes the ordering process easier for industrial customers.
Countries We Export Carbon Steel Welded Tubes To
Our carbon steel welded tubes reach customers in 85+ countries, covering major industrial markets across the Middle East, Europe, Asia Pacific, Africa, North America, and South America. We handle different tube specifications, sizes, grades, and finishes for industrial and engineering requirements, with export packing and documentation prepared according to the destination.
North America: United States, Canada, Mexico
Middle East: UAE, Saudi Arabia, Qatar, Kuwait, Oman, Bahrain
Europe: UK, Germany, France, Italy, Netherlands, Spain
Asia Pacific: Australia, Singapore, Malaysia, Indonesia, Thailand, Vietnam
Africa: South Africa, Egypt, Nigeria, Kenya, Algeria
South America: Brazil, Argentina, Chile, Peru, Colombia
Our international supply experience allows us to work with distributors, fabricators, and industrial Carbon Steel Welded Tubes Suppliers in different markets. Export packing, coating protection, inspection documents, and shipping paperwork can be arranged to suit the requirements of each order and destination.
Carbon Steel Welded Tubes FAQs
Common questions about carbon steel welded tube grades, sizes, standards, testing, and supply.
Are carbon steel welded tubes strong enough for pressure service?
Yes, within their design limits. ASTM A178 and A214 welded tubes serve low-pressure boilers, condensers, and heat exchangers. Design codes apply a weld joint factor, so very high-pressure and high-temperature duty usually goes to seamless tubes.
Which grade should I choose for a condenser or heat exchanger?
ASTM A214 is the standard welded grade for condensers and heat exchangers. For boilers and air heaters, choose ASTM A178.
What is the difference between ERW tubes and cold drawn welded tubes?
ERW tubes leave the weld line after sizing. Cold drawn welded tubes get a further pull over a mandrel, which removes the inside bead and tightens the size.
Do welded tubes have a weld bead inside?
The mill trims the outside bead on every tube. For as-welded tubes, the inside bead can be trimmed or left, depending on the standard, and cold drawn welded tubes carry no inside bead.
Can I bend and flare carbon steel welded tubes?
Yes. Low carbon welded tubes bend, flare, and flatten well, and we pass flaring and flattening tests on the lot. We also bend tubes into U-shapes to your radius.
Can welded tubes work in hydraulic systems?
They work in low-pressure hydraulic and pneumatic lines and as cylinder barrels. Cold drawn welded tubes to EN 10305-2 suit these jobs, and very high-pressure lines usually take seamless tubes.
Do carbon steel welded tubes rust?
Yes, carbon steel rusts in air and water. We supply tubes oiled, phosphated, varnished, or galvanized, and we cap the ends for storage and transit.
What sizes do your carbon steel welded tubes come in?
We supply round tubes from 1/4" to 6" OD, in walls from 22 BWG to 6.35 mm, plus square and rectangular tubes from 20 × 20 mm to 100 × 100 mm. Other sizes are available on request.
What decides the price of carbon steel welded tubes?
Coil price, grade, size, wall thickness, condition, tolerance class, quantity, and delivery port all shape the price. Send us your enquiry for a current quote.
Which certificate comes with the tubes?
Every order ships with an EN 10204 3.1 certificate. We issue 3.2 with third-party inspection on request.
Are you a carbon steel welded tubes manufacturer or a supplier?
Both. We manufacture the tubes and also work as a carbon steel welded tubes supplier in India, with ready