Stainless Steel Welded Tubes Manufacturer in India
Stainless Steel Welded Tubes Manufacturer in India
Sachiya Steel International is a leading Stainless Steel Welded Tubes Manufacturer in India, established in 2005 with 20+ years of experience in producing and supplying industrial tubes. We manufacture welded tubes in grades including 304, 304L, 316, 316L, 321, 347, 904L, and duplex grades for heat exchangers, process systems, food processing, pharmaceutical equipment, chemical plants, marine applications, and general engineering. We produce tubes to applicable ASTM, ASME, ANSI, DIN, and ISO standards with different sizes, wall thicknesses, and finishes.
We supply and export stainless steel welded tubes to customers across 85+ countries and can manufacture and export up to 100 tons every month. Our services include cutting, bending, polishing, cleaning, annealing, pickling, and testing based on project requirements. We provide EN 10204 3.1 material certificates with orders and support traceability through heat numbers and inspection records. Our quality systems include ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, and applicable TÜV certifications, helping us maintain consistent quality and dependable international supply.
What Are Stainless Steel Welded Tubes?
Stainless steel welded tubes are made by forming flat stainless steel strip or sheet into a round shape and joining the edges along the length. Unlike seamless tubes, they have a welded seam. The process allows good control over tube diameter, wall thickness, surface finish, and overall dimensions.
Production starts with stainless steel strip selected for the required grade and thickness. Forming rolls shape the material, and welding methods such as TIG, high-frequency, or laser welding join the edges. The tube can then undergo annealing, sizing, straightening, pickling, passivation, polishing, and cutting.
Manufacturers inspect the weld and may perform eddy current, hydrostatic, or ultrasonic testing according to the required standard. Welded tubes offer consistent dimensions and long lengths, making them suitable for heat exchangers, food processing, pharmaceutical, chemical, water, instrumentation, and general industrial applications.
Stainless Steel Welded Tubes
High-quality stainless steel welded tubes manufactured for demanding applications across chemical, petrochemical, power generation, pharmaceutical, marine, construction and engineering industries. Available in various sizes, grades, wall thicknesses and international standards.
Types of Stainless Steel Welded Tubes
Stainless steel welded tubes come in different grades and forms to suit requirements for corrosion resistance, temperature, strength, and surface finish. The right tube depends on the application, dimensions, welding method, and applicable standard.
- 304 Welded Tubes: Suitable for food processing, water systems, construction, fabrication, and general industrial applications.
- 304L Welded Tubes: Lower carbon content helps maintain corrosion resistance in welded areas and supports further fabrication.
- 316 Welded Tubes: Molybdenum improves resistance to chlorides and chemicals, making the grade useful for marine and process applications.
- 316L Welded Tubes: Offers good corrosion resistance and weldability for pharmaceutical, chemical, food, and marine systems.
- 321 Welded Tubes: Titanium stabilization makes this grade suitable for elevated-temperature applications.
- 347 Welded Tubes: Niobium stabilization supports performance in high-temperature welded service.
- 904L Welded Tubes: High nickel and molybdenum content provides strong resistance to aggressive acids and corrosive environments.
- Duplex Welded Tubes: Combine high strength with good corrosion resistance for demanding industrial and engineering applications.
- Super Duplex Welded Tubes: Provide high strength and excellent chloride corrosion resistance for offshore, marine, and severe process environments.
A reliable stainless steel welded tubes manufacturer can supply these grades in different sizes, wall thicknesses, finishes, and specifications based on project requirements.
304 Welded Tubes, 316L Welded Tubes, Sanitary Tubes, Heat Exchanger Tubes, Polished Decorative Tubes, Square and Rectangular Tubes, Stainless Steel Welded Tubes Manufacturers and Suppliers in India
We are one of the stainless steel welded tubes manufacturers in India that dairy engineers, exchanger shops, and fabricators call when they want a clean weld and steady supply. Our yard near Mumbai holds common grades and sizes in stock, and we roll other sizes to order.
For heat transfer equipment, our ASTM A249 304, 316L, and 321 tubes serve condensers, exchangers, and boilers at a lower price than seamless. For milk, beer, juice, and pharma lines, our ASTM A270 sanitary tubes carry a ground-smooth bore and a bright finish. For general process and instrument work, our ASTM A269 tubes cover water, air, and mild chemicals.
For buildings and equipment, our ASTM A554 polished tubes form handrails, balustrades, gates, and frames in round, square, rectangular, and oval shapes. Grades 201, 202, and 430 serve dry indoor work at a lower cost.
As a stainless steel welded tubes supplier, we treat the finish and the cutting as part of the tube. We polish to the grit you choose, wrap polished tubes against scratches, cut to exact length, and cap every tube. Buyers comparing stainless steel welded tubes suppliers can send us the grade, OD or size, wall, finish, length, quantity, and port. We will reply with a price, a lead time, and the certificate type.
Types of Pipes & Tubes
Explore our range of industrial pipes and tubes, manufactured for different applications, materials, specifications and engineering requirements.
Pipes and Tubes
→
Seamless Pipes
→
ERW Pipes
→
LSAW Pipes
→
SSAW Pipes
→
Seamless Tubes
→
Welded Pipes
→
Welded Tubes
→
Box Pipes
→
Box Tubes
→
Brass Pipes
→
Heat Exchanger Tubes
→
Boiler Tubes
→
Aluminium Pipes
→
Carbon Steel Seamless Pipes
→
Carbon Steel Pipe
→
Stainless Steel Pipe
→
Alloy Steel Pipe
→
Duplex Steel Pipe
→
Super Duplex Steel Pipe
→
Nickel Alloy Pipe
→
Copper Nickel Alloy Pipe
→Get Certified Stainless Steel Welded Tubes at Competitive Factory Prices
Stainless Steel Welded Tubes Specification
| Parameter | Standard Option | Premium Option |
|---|---|---|
| Size Range | 1/4" to 6" OD (6.35 mm to 152.4 mm) round | Square and rectangular up to 100 × 100 mm; oval to drawing |
| Wall Thickness | 0.5 mm to 5 mm | Heavier walls on request |
| Welding Method | TIG, plasma, laser; no filler wire | – |
| Condition | As welded and annealed | Welded and cold drawn, for tight size and smooth bore |
| Grades | 304, 304L, 316, 316L, 321, 347, 201, 202, 430 | 904L, 2205 |
| Surface Finish | Annealed and pickled, 2B, satin | Bright annealed, mirror polished |
| Weld Bead | Outside bead ironed or ground | Inside bead ground flush on request |
| Length | 6 m, 9 m, 12 m, 20 ft, exact cut | Coil or U-bend to drawing |
| Tolerance | ASTM A249 / A269 / A554 class | Tighter class by agreement |
| Testing | Eddy current weld test, flattening, flaring, hardness, PMI | Hydrostatic, reverse flattening, IGC (A262), ferrite check |
| Certificate | EN 10204 3.1 | EN 10204 3.2 |
Stainless Steel Welded Tube Standards and Specifications
| Standard | What It Covers | Use |
|---|---|---|
| ASTM A249 / ASME SA249 | Welded austenitic boiler, superheater, heat exchanger, and condenser tubes | Heat transfer equipment |
| ASTM A269 / ASME SA269 | Seamless and welded austenitic tubing for general service | Process and instrument lines |
| ASTM A270 | Seamless and welded sanitary tubing | Dairy, food, pharma |
| ASTM A554 | Welded stainless mechanical tubing | Handrails, frames, trim, furniture |
| ASTM A268 | Ferritic and martensitic tubing | Grade 430 and similar |
| ASTM A789 / ASME SA789 | Duplex tubing | Seawater, offshore |
| ASTM A1016 | General requirements for ferritic, austenitic, duplex tubes | Tolerances, tests, marking |
| EN 10217-7 | Welded stainless steel pressure tubes | European pressure lines |
| EN 10296-2 | Welded stainless tubes for mechanical and general use | Structural and general engineering |
| DIN 17457 | Welded austenitic stainless tubes | German-spec projects |
| JIS G3446, G3447, G3448, G3463 | Japanese stainless tubes for structure, sanitary, piping, and heat exchangers | Japanese-spec projects |
| ASTM A262 Practice E | Intergranular corrosion test | Sensitisation check |
| ASTM A380, A967 | Cleaning and passivation | Surface condition |
| ASME Section I, II, VIII | Boiler and pressure vessel code | Design approval |
Stainless Steel Welded Tubes Material and Grades
| Grade | UNS | EN No. | Corrosion Resistance | Typical Use |
|---|---|---|---|---|
| 201 | S20100 | 1.4372 | Basic | Indoor decorative frames and trim |
| 202 | S20200 | 1.4373 | Basic | Indoor decorative frames and trim |
| 430 | S43000 | 1.4016 | Basic to good | Appliances, exhaust parts, trim |
| 304 | S30400 | 1.4301 | Good | Food, water, architecture, general process |
| 304L | S30403 | 1.4307 | Good | Welded systems in mild chemicals |
| 316 | S31600 | 1.4401 | Better | Chlorides, coastal air, dilute acids |
| 316L | S31603 | 1.4404 | Better | Pharma, marine, instrument tubes |
| 321 | S32100 | 1.4541 | Good, heat-stable | Hot service up to about 850°C |
| 347 | S34700 | 1.4550 | Good, heat-stable | Refinery and power service |
| 904L | N08904 | 1.4539 | High | Hot sulphuric and phosphoric acids |
| 2205 | S32205 | 1.4462 | High | Seawater, desalination, offshore |
What Is the Difference Between Stainless Steel Welded Tubes and Stainless Steel Welded Pipes?
The difference is how you order them and how tight they run. You order a tube by exact outside diameter and wall thickness, and the mill holds tight limits and a better surface, so the tube fits fittings, ferrules, and tubesheets without play. You order a pipe by nominal size and schedule, and the mill allows wider limits, because the pipe's job is to carry fluid. A tube also comes in more shapes, including square, rectangular, and oval, while pipe is round.
Choose a welded tube for heat exchangers, instrument lines, sanitary systems, frames, and handrails. Choose a welded pipe for process lines sized by NPS.
| Point | Stainless Steel Welded Tubes | Stainless Steel Welded Pipes |
|---|---|---|
| Sizing | Exact OD and wall (inch, BWG, or mm) | Nominal pipe size and schedule |
| Tolerance | Tight | Wider |
| Wall Range | 0.5 mm to 5 mm and above | SCH 5S to 80S and above |
| Shapes | Round, square, rectangular, oval | Round only |
| Surface | Polished, bright annealed, satin | Annealed and pickled |
| Weld Finishing | Bead ironed or ground, often drawn | Bead trimmed |
| Typical Standards | ASTM A249, A269, A270, A554 | ASTM A312, A358 |
| Main Job | Heat transfer, hygiene, structure, appearance | Carrying process fluids |
| Price | Depends on finish and tolerance | Lower for plain annealed pipe |
Stainless Steel Welded Tubes Chemical Composition
Chemistry sets the corrosion resistance, strength, and weldability of each grade. Values are weight percent.
Austenitic, Ferritic and Duplex Grades
| Grade | C (max) | Mn (max) | Si (max) | P (max) | S (max) | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| 304 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–11.0 | – | – |
| 304L | 0.035 | 2.00 | 1.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–13.0 | – | – |
| 316 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 16.0–18.0 | 11.0–14.0 | 2.0–3.0 | – |
| 316L | 0.035 | 2.00 | 1.00 | 0.045 | 0.030 | 16.0–18.0 | 10.0–15.0 | 2.0–3.0 | – |
| 321 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 17.0–19.0 | 9.0–12.0 | – | Ti 5×(C+N) min–0.70 |
| 347 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 17.0–19.0 | 9.0–13.0 | – | Nb 10×C min–1.00 |
| 904L | 0.020 | 2.00 | 1.00 | 0.040 | 0.030 | 19.0–23.0 | 23.0–28.0 | 4.0–5.0 | Cu 1.0–2.0 |
| 430 | 0.12 | 1.00 | 1.00 | 0.040 | 0.030 | 16.0–18.0 | – | – | – |
| 2205 | 0.030 | 2.00 | 1.00 | 0.030 | 0.020 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | N 0.14–0.20 |
Low-Nickel Decorative Grades (ASTM A554)
| Grade | C (max) | Mn | Si (max) | P (max) | S (max) | Cr | Ni | N (max) |
|---|---|---|---|---|---|---|---|---|
| 201 | 0.15 | 5.5–7.5 | 1.00 | 0.060 | 0.030 | 16.0–18.0 | 3.5–5.5 | 0.25 |
| 202 | 0.15 | 7.5–10.0 | 1.00 | 0.060 | 0.030 | 17.0–19.0 | 4.0–6.0 | 0.25 |
Stainless 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 ksi (MPa) | Yield ksi (MPa) | Elongation % | Hardness (max) |
|---|---|---|---|---|
| 304, 316, 321, 347 | 75 (515) | 30 (205) | 35 | 90 HRB / 192 HBW |
| 304L, 316L | 70 (485) | 25 (170) | 35 | 90 HRB / 192 HBW |
| 904L | 71 (490) | 31 (220) | 35 | – |
| 430 | 60 (415) | 40 (275) | 20 | – |
| 2205 | 95 (655) | 65 (450) | 25 | 30.5 HRC / 290 HBW |
Grades 201 and 202 under ASTM A554 ship to the strength and hardness agreed in the order. Because the weld is part of the tube, design codes also give it a joint factor, often 0.85, so the allowed pressure can be lower than for seamless tube of the same wall. The mill test certificate lists the exact values for each heat.
Stainless Steel Welded Tube Size and Weight Chart
Tubes are ordered by outside diameter and wall thickness. The first chart covers popular round sizes with weight per metre and per 6 m length. The second covers square and rectangular sections. Weights use 304 stainless steel at 7.93 g/cm³. Tubes in 316 weigh about 1% more.
Round Tubes
| OD mm | Wall mm | kg per Metre | kg per 6 m Length |
|---|---|---|---|
| 12.70 | 1.0 | 0.29 | 1.75 |
| 12.70 | 1.5 | 0.42 | 2.51 |
| 15.88 | 1.2 | 0.44 | 2.63 |
| 19.05 | 1.0 | 0.45 | 2.70 |
| 19.05 | 1.2 | 0.53 | 3.20 |
| 19.05 | 1.5 | 0.66 | 3.93 |
| 25.40 | 1.2 | 0.72 | 4.34 |
| 25.40 | 1.5 | 0.89 | 5.36 |
| 25.40 | 2.0 | 1.17 | 7.00 |
| 31.75 | 1.5 | 1.13 | 6.78 |
| 31.75 | 2.0 | 1.48 | 8.89 |
| 38.10 | 1.5 | 1.37 | 8.21 |
| 38.10 | 2.0 | 1.80 | 10.79 |
| 38.10 | 2.5 | 2.22 | 13.30 |
| 50.80 | 1.5 | 1.84 | 11.05 |
| 50.80 | 2.0 | 2.43 | 14.59 |
| 50.80 | 3.0 | 3.57 | 21.43 |
| 63.50 | 1.5 | 2.32 | 13.90 |
| 63.50 | 2.0 | 3.06 | 18.38 |
| 63.50 | 3.0 | 4.52 | 27.13 |
| 76.20 | 2.0 | 3.70 | 22.18 |
| 76.20 | 3.0 | 5.47 | 32.82 |
| 101.60 | 2.0 | 4.96 | 29.77 |
| 101.60 | 3.0 | 7.37 | 44.21 |
To work out the weight of any round size, use Weight (kg/m) = (OD − Wall) × Wall × 0.02491 for 304, with both values in mm.
Square and Rectangular Tubes, Approximate Weight in kg per Metre
| Size mm | 1.2 mm Wall | 1.5 mm Wall | 2.0 mm Wall | 2.5 mm Wall | 3.0 mm Wall |
|---|---|---|---|---|---|
| 20 × 20 | 0.72 | 0.88 | 1.14 | 1.39 | 1.62 |
| 25 × 25 | 0.91 | 1.12 | 1.46 | 1.78 | 2.09 |
| 40 × 40 | 1.48 | 1.83 | 2.41 | 2.97 | 3.52 |
| 50 × 50 | 1.86 | 2.31 | 3.05 | 3.77 | 4.47 |
| 60 × 60 | 2.24 | 2.78 | 3.68 | 4.56 | 5.42 |
| 80 × 80 | – | 3.74 | 4.95 | 6.15 | 7.33 |
| 100 × 100 | – | – | 6.22 | 7.73 | 9.23 |
| 40 × 20 | 1.10 | 1.36 | 1.78 | 2.18 | 2.57 |
| 50 × 25 | 1.38 | 1.71 | 2.25 | 2.78 | 3.28 |
| 100 × 50 | – | – | 4.63 | 5.75 | 6.85 |
Square and rectangular weights use Weight (kg/m) = 0.00793 × 2 × Wall × (Side A + Side B − 2 × Wall), with values in mm. The result ignores corner radii, so real weights run slightly lower.
Common Materials
The material grade determines how stainless steel welded tubes perform against corrosion, heat, chemicals, and fabrication stress. Stainless steel welded tubes suppliers can provide different grades depending on the service conditions, required finish, tube dimensions, and applicable standard.
304 / 304L (UNS S30400 / S30403): 304 works well for food equipment, water systems, architectural applications, and general fabrication. 304L uses lower carbon content, making it a practical choice for welded assemblies.
316 / 316L (UNS S31600 / S31603): Molybdenum gives these grades better resistance to salt, chlorides, and many cleaning chemicals. They suit marine, pharmaceutical, chemical, and process applications.
321: Titanium stabilization makes this grade suitable for welded components exposed to elevated temperatures.
347: Niobium stabilization helps maintain performance in high-temperature service.
904L (UNS N08904): Provides strong resistance to aggressive acidic environments and demanding chemical service.
Duplex 2205 (UNS S32205): Combines higher strength with good resistance to chloride corrosion and stress corrosion cracking.
201 / 202 (UNS S20100 / S20200): More economical grades for indoor and decorative applications where severe corrosion resistance is not required.
430 (UNS S43000): A magnetic ferritic grade used for appliances, trim, exhaust components, and other general applications.
Before ordering, confirm the grade, standard, surface finish, and tolerance so the tube matches the actual service requirements.
Available Sizes, Dimensions and Tolerances
We supply round stainless steel welded tubes from 1/4" to 6" OD, in walls from 0.5 mm to 5 mm, and square and rectangular tubes 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. A welded and