ERW Steel Tubes Manufacturer in India

Electric resistance welded. The tube is made from steel strip, formed, and its edges welded by electric current and pressure without filler metal.

ERW pipe is formed from flat steel strip that is rolled into a round and welded along one seam. Seamless pipe is pierced and drawn from a solid steel billet, so it has no weld seam.

• Cost: ERW is cheaper and quicker to make; seamless costs more.
• Size accuracy: ERW is made from rolled strip with tight control over wall thickness and diameter.
• Pressure: seamless is generally chosen for very high-pressure, high-temperature or critical service; modern ERW with seam normalizing is widely used for water, fire, gas distribution and structural work.
• Typical use: ERW for structural, water, mechanical and general engineering; seamless for boilers, high-pressure and process lines.

If your specification demands seamless, ERW is not a substitute. For most structural, water and general engineering jobs, ERW meets the requirement at lower cost.

• Round: OD from 21 mm to 273.1 mm
• Square hollow sections (SHS): 16 x 16 mm to 200 x 200 mm
• Rectangular hollow sections (RHS): 26 x 13 mm to 250 x 150 mm
• Thickness: 1.20 mm to 8.0 mm
• Length: 3.5 m to 7.5 m

Not every thickness is made in every size, so send us your size and wall thickness and we will confirm availability.

YST stands for yield strength tube, the grade designation used in Indian standards for steel tubes such as IS 4923 and IS 1161. The number is the minimum yield strength of the steel in MPa (N/mm²). So YST 210 has a minimum yield strength of 210 MPa, YST 240 has 240 MPa and YST 310 has 310 MPa.

A higher number means a stronger tube, which lets a structural designer use a lighter section for the same load. Your structural engineer's drawing will state the grade; if it does not, ask before ordering.

Yes. ERW pipe made to IS 1239 (Part 1) or IS 3589 is intended for water, gas, steam and air lines and is used for plumbing, water mains, sewerage, treatment plants and firefighting lines.

Black (uncoated) pipe will rust over time if exposed to water and air, so for drinking water, buried or outdoor lines, or corrosive conditions, a galvanized pipe or a protective coating is the better choice. Black pipe is common for fire sprinkler and closed-loop systems. See our GI pipes if you need zinc-coated pipe.

• Scaffolding: tubes made to BS EN 39. The common scaffold tube is 48.3 mm OD (40 NB, 1-1/2 inch), usually in 3.2 mm or 4.0 mm wall.
• Round structural tube: IS 1161 (Avon holds a BIS licence), or EN 10219 for CE-marked structural hollow sections.
• Square and rectangular sections: IS 4923 (grades YST 210, 240, 310) and EN 10219, used for frames, trusses, sheds, gates and furniture.
• Poles and towers: IS 1161 and IS 4923 as specified by the design.

Tell us the load, span and drawing requirement and we will suggest the standard, grade and wall thickness.

For a round tube, use this formula:

Weight (kg per metre) = (OD − wall thickness) × wall thickness × 0.02466 (OD and thickness in mm)

Example: a 60.3 mm OD pipe with 3.2 mm wall: (60.3 − 3.2) × 3.2 × 0.02466 = 4.51 kg per metre, which matches the chart above. For a 6 m length, that is about 27 kg.

For square and rectangular tubes, a close estimate is: weight (kg per metre) = 0.00785 × wall thickness × (a + b − 2 × wall thickness) × 2, where a and b are the outer side lengths in mm; corner radii make the actual weight slightly lower. Formulas give theoretical weight; actual weight varies within the tolerance in the standard. Use our weight chart for common sizes.

Yes. We manufacture in Ludhiana, Punjab, and supply dealers, fabricators and project buyers across Punjab, India and export markets. Send your delivery location with your enquiry and we will confirm freight and delivery time.

• Steel price: mainly the cost of hot-rolled coil, which changes with the market.
• Size and wall thickness: more steel per metre costs more.
• Grade and standard: structural grades (YST 310) and certified products such as CE-marked EN 10219 can cost more than general-purpose tube.
• Finish and ends: black, oiled, painted, plain or bevelled ends, special lengths.
• Quantity: bulk orders and standard lengths get better rates.
• Testing, certificates and freight: inspection requirements and delivery distance.
• Taxes: GST is charged as applicable.

Send us your size, thickness and quantity for a written quote.

Minimum order quantity and dispatch time depend on size, thickness and the current production plan. Send your requirement and we will confirm quantity and delivery date in your written quote.

ERW pipe is sold by nominal bore (NB) in inches, which is not the real outside diameter. The sizes in our weight chart are:

Other common sizes: 1/2 inch (15 NB, OD 21.3 mm), 3/4 inch (20 NB, 26.9 mm), 1-1/4 inch (32 NB, 42.4 mm), 2-1/2 inch (65 NB, 76.1 mm), 4 inch (100 NB, 114.3 mm), 5 inch (125 NB, 139.7 mm) and 8 inch (200 NB, 219.1 mm). Tell us the inch size and wall thickness you need.

ERW black pipe is supplied uncoated, as made, with the dark mill finish. GI pipe is an ERW pipe that has been hot-dip galvanized, which covers it with a zinc layer that resists rust.

• Corrosion: GI resists rust in water and outdoors; black pipe needs paint or another coating if it will be exposed.
• Cost: black pipe is lower in price; GI costs more because of the zinc coating.
• Best for: black for structural frames that will be painted, fabrication, fire sprinkler and closed systems; GI for drinking water, outdoor, irrigation and corrosive environments.
• Welding: black pipe welds easily; GI can be welded but the zinc coating burns off and gives off fumes, so use good ventilation and re-coat the weld area.

Avon Steel makes both: black ERW tubes and hot-dip galvanized GI pipes from the same ERW mills.