ERW Pipe_carbon steel erw pipe manufacturer_china carbon steel erw pipe factory

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

ERW (Electric Resistance Welded) pipes are produced through the cold forming of a steel coil, shaping it into a cylindrical form.

These pipes are created by forming the steel coil, and the resulting weld seam aligns parallel to the pipe. 

Due to the coil’s width being equivalent to the pipe’s circurtation of oil, natural gas, and various vapor-liquid substances, catering to diverse high and low-pressure specifications.

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Introduction of ERW Steel Pipe 

  • 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)
  • 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
Introduction Of ERW Steel Pipe

Size of ERW steel pipe


Application of UniAsen Carbon Steel ERW Pipe

ERW (resistance welded) steel pipes are formed by resistance welding from cold rolled coils or hot rolled coils. They have many uses and can be used in a variety of structures.

ERW pipe is popular because it costs less to make and is reliable in many uses. The following are common structural applications of ERW steel pipe:

Building Structure

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

Pipeline System

ERW 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.


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

Car Structure

Automobile manufacturers use ERW steel pipes in chassis, frames, and other structural components. Its light weight, high strength and workability make it ideal for automotive manufacturing.

Power Transmission Lines

ERW 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.

Manufacturing Process of ERW Steel Pipe 

ERW steel pipes are made using high-quality steel coils. The process begins with uncoiling of the coils and is then fed into the mill, where the edges of steel sheets are trimmed, and they’re rolled to shape them into a cylindrical shell. After that, high-frequency currents pass through the sheets to create the weld. The pipes formed then undergo some rolling operations to ensure the desired size.

ERW Pipe manufacturing process-china carbon steel erw pipe factory

What is ERW Steel Pipe?

ERW steel pipe is a type of steel pipe whose name stands for “Electric Resistance Welded Pipe.” It is a steel pipe manufactured through the resistance welding process, which involves crimping a steel plate into a tube and then resistance welding on both sides of the tube, welding the edges together to create a seamless weld.

ERW pipe is mainly used in the transportation of oil, natural gas, and other vaporous-liquid objects. In order to meet different needs for high and low-pressure operation, ERW steel tubes have been developed into various specifications, according to their properties.

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ERW Pipe_What is ERW Pipe

Difference between ERW and Seamless Pipe

ERW Pipe and Seamless Pipe are two different types of steel pipe, they have some obvious differences in manufacturing process, appearance, performance 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
  • Raw material is 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 About UNIASEN ERW Steel Pipe

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, and more. 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, mainly used in pipe manufacturing. Their main difference lies in the welding method and scope of application.

EFW (Electric Fusion Welding):

  1. Welding method: The base material is heated to a molten state by arc heating, and then filled with welding wire.
  2. Scope of application: Usually used in the manufacture of pipes and fittings with larger diameters and thicker walls.
  3. 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 wall pipe, while ERW is more suitable for small diameter, thin wall 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. Renowned for its strength, carbon steel is the primary material. 

In ERW, the edges of the steel strip or coil are heated until they melt using electricity. This creates a joint when pressed together. 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.

If there is sufficient inventory, we will deliver the product to the shipping port within 7 days.

If there is no stock, we usually complete the production of the product within 30 days.

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

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

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