ERW Steel Pipe

API 5L gas line pipe carbon steel erw pipe factory

carbon steel ERW pipe Factory

ERW Steel Pipe(Electric Resistance Welded Pipe), Carbon Steel ERW Pipe

Electric Resistance Welded (ERW) pipe is made from high-quality carbon steel coils, cold-formed into a cylindrical shape with a longitudinal weld parallel to the pipe.

Uniasen is a trusted wholesale ERW pipe supplier in China. Our ERW pipes are manufactured using advanced automated welding lines and are available in diameters up to 24 inches (610 mm) to meet different industry needs. The coil width matches the circumference of the pipe, ensuring performance for the transportation of oil, gas, and various liquids or steam.

Our pipes range in size from 1/2 inch to 24 inches, suitable for welding, threading, grooved, and bending, providing versatility for projects around the world

ERW pipes Specifications

Name ERW（Electrical Resistance Weld）
Standard API 5L, API 5CT, ASTM A53, ASTM A252, ASTM A500, AS1163, ASTM A795, ASTM A135, BS1139, BS1387, EN 10217, EN 10219, EN39, JIS G3444, JIS G3452
Grade GR.A, GR.B, GR.1-GR.3, X42-X70, J55, K55, Q195-Q345, C250, C350, C250L0, STK500, C350L0 P1957121-P2657R2, S235JOH-S355JOH, S235GT
Types Line Pipe, Casing Pipe, Structure Pipe, Scaffolding, Pilling Pipe, Conduit Pipe, Sprinkler Pipe, Fluid Transmission Pipe, Torque Tube, Roller Tube
Sizes Out diameter 1/2″ ~ 24″(21.3mm ~ 610mm, DN15~ DN600)
Thickness 2mm ~ 17.48mm(SCH 5S ~SCH XXS)
3m-18m 3m-18m
Surface Coating Varnishing, Oiling, Hot Dip Galvanizing
End Type Plain, Bevelled, Threaded, Grooved
Joint Method Fitting, Flange, Coupling, Clamp, Pipe Shoulder, Welding
Pipe Machining Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

ERW pipe Size Chart​

NOMINAL PIPE SIZE OD NOMINAL WALL THICKNESS
DN INCH MM SCH10 SCH20 SCH30 STD SCH40 SCH60 XS SCH80
15 1/2 21.3 2.11 2.41 2.77 2.77 3.73 3.73
20 3/4 26.7 2.11 2.41 2.87 2.87 3.91 3.91
25 1 33.4 2.77 2.9 3.38 3.38 4.55 4.55
32 1.1/4 42.2 2.77 2.97 3.56 3.56 4.85 4.85
40 1.1/2 48.3 2.77 3.18 3.68 3.68 5.08 5.08
50 2 60.3 2.77 3.18 3.91 3.91 5.54 5.54
65 2.1/2 73 3.05 4.78 5.16 5.16 7.01 7.01
80 3 88.9 3.05 4.78 5.49 5.49 7.62 7.62
90 3.1/2 101.6 3.05 4.78 5.74 5.74 8.08 8.08
100 4 114.3 3.05 4.78 6.02 6.02 8.56 8.56
125 5 141.3 3.4 6.55 6.55 9.53 9.53
150 6 168.3 3.4 7.11 7.11 10.97 10.97
200 8 219.1 3.76 6.35 7.04 8.18 8.18 10.31 12.7 12.7
250 10 273.1 4.19 6.35 7.8 9.27 9.27 12.7 12.7 15.09
300 12 323.9 4.57 6.35 8.38 9.53 10.31 14.27 12.7 17.48
350 14 355.5 6.35 7.92 9.53 9.53 11.13 15.09 12.7 19.05
400 16 406.4 6.35 7.92 9.53 9.53 12.7 16.66 12.7 21.44
450 18 457.2 6.35 7.92 11.13 9.53 14.27 19.05 12.7 23.83
500 20 508 6.35 9.53 12.7 9.53 15.09 20.62 12.7 26.19
550 22 553.8 6.35 9.53 12.7 9.53 22.23 12.7 28.58
600 24 609.6 6.35 9.53 14.27 9.53 17.48 24.61 12.7 30.96

Applications of ERW Pipe

ERW pipe, a reliable choice, is popular for its affordability in many applications. The following are common structural applications of ERW steel pipe:

Building StructureERW steel pipes are commonly used in building structures, support structures and other building elements. Such as bridges, supports, columns, stairs, etc.

Pipeline SystemERW steel pipes are widely used in oil and gas pipelines, water pipelines, sewer systems and other transportation systems. In these systems, ERW steel pipe provides sealing, corrosion resistance and pressure resistance.

EquipmentERW steel pipes make structures and parts for different machines. Its customizability and high strength make it a commonly used material in machine manufacturing.

Car StructureAutomobile manufacturers use ERW steel pipes in chassis, frames, and other structural components. Their light weight, high strength , and workability make them ideal for automotive manufacturing.

Power Transmission LinesERW steel pipes are used in structures that support power transmission lines. Because it conducts electricity well and resists damage from the environment, it is used in the power industry.

ERW Pipe Manufacturing Process

ERW steel pipes are manufactured from high-quality steel coils. The process starts with uncoiling the coils, followed by feeding them into a mill where the sheet edges are trimmed and rolled into a cylindrical shell. High-frequency currents are then applied to weld the edges. The formed pipes undergo additional rolling to achieve the desired dimensions.

ERW Pipe manufacturing process-china carbon steel erw pipe factory

What is ERW Pipe?

ERW steel pipe is a type of steel pipe called “Electric Resistance Welded Pipe.” It is made through resistance welding. This process involves crimping a steel plate into a tube and then welding both sides of the tube. This welds the edges together to make a seamless weld.ERW pipe mainly transports oil, natural gas, and other vaporous-liquid objects. ERW steel tubes have been developed into many specifications to meet different high- and low-pressure operation needs.

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ERW Pipe_What is ERW Pipe

Difference between ERW and Seamless Pipe

ERW Pipe and Seamless Pipe are two types of steel pipe. They have clear differences in manufacturing process, appearance, and other aspects. The following are the main differences between them:

ERW Pipe

  • Cheaper compared to a seamless steel pipe
  • A welded joint is present in their cross-section.
  • Made of steel coils
  • Outer diameter varies between 2-3/8 Inch and 24-inch
  • Used for low/ medium pressure applications
  • The thickness tolerance as well as length tolerance of these pipes is moderately precise

Seamless Pipe

  • Expensive
  • No welded joints
  • The raw material is a solid round billet.
  • Outer diameter varies between 1/8 Inch and 26-inch
  • Used for high-pressure applications
  • Thickness tolerance as well as length tolerance is good.

FAQs

ERW steel pipe is made by heating metal plates or strips and welding them together. Using resistance welding technology, efficient production and various specifications. It is used in construction, oil and gas transportation, machinery, automobiles, plumbing, bridges, etc. It is widely favored for its low cost and high efficiency.

EFW (Electric Fusion Welding) and ERW (Electric Resistance Welding) are two common welding methods. They are mainly used in making pipes. Their main differences lie in the welding method and scope of application.EFW (Electric Fusion Welding):

  • Welding method: The base material is heated to a molten state by arc heating, and then filled with welding wire.
  • Scope of application: Usually used to manufacture pipes and fittings with larger diameters and thicker walls.
  • Applicable Materials: Suitable for various types of alloys and steels.

ERW (Electric Resistance Welding):

  • Welding method: Use the heat generated by the resistance to heat the edge of the base material to a molten state, and then press it to form a weld.
  • Scope of application: Suitable for small-diameter, thin-walled pipes and suitable for mass production.
  • Applicable materials: Mainly used for carbon steel and low alloy steel.

Common points:All are suitable for pipe manufacturing and used to transport liquids and gases.Efficient production to meet large-scale production needs.Summary of differences:

  • Size and Thickness:

EFW is suitable for large-diameter, thick-walled pipe, while ERW is more suitable for small-diameter, thin-walled pipe.

  • Cost:

Due to differences in production processes and uses, ERW is generally less expensive than EFW.The method chosen usually depends on project needs and cost.

A Carbon ERW Steel Pipe is made from carbon steel using the efficient ERW welding process. Carbon steel is the primary material, renowned for its strength. In ERW, the steel strip or coil edges are heated until they melt using electricity. When pressed together, this creates a joint. This method is cost-effective and ideal for mass production. The advantages include efficient production, versatility in sizes, and economic feasibility. 

UNIASEN usually has 20,000 tons of steel pipes in stock.We will deliver the product to the shipping port within 7 days if there is sufficient inventory.If there is no stock, we usually complete the production of the product within 30 days. Contact us for delivery times.

We offer a variety of diameters from 1/2 inch to 24 inches, and wall thickness can be customized according to customer needs.

Our products comply with quality standards such as ASTM A53, API 5L and are equipped with relevant quality inspection reports.

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