Electric Resistance Welded (ERW) Pipes
Electric Resistance Welded (ERW) Pipes
Electric Resistance Welded Pipes are one of the most widely used types of steel pipes in modern industries. Manufactured using a high-frequency welding process, ERW pipes are known for their durability, smooth surface finish, uniform wall thickness, and high dimensional accuracy. These pipes are an ideal solution for both structural and pressure applications and are extensively used in sectors such as oil & gas, construction, water transmission, automotive, and more.
At Emirerri Steel, we manufacture and supply premium-quality ERW pipes that meet international standards and are available in a wide range of grades, sizes, and specifications to cater to the diverse needs of our global clientele.
What is an ERW Pipe?
ERW stands for Electric Resistance Welding, a process in which steel sheets or coils are rolled into a cylindrical shape and the edges are welded together using electric resistance. Unlike seamless pipes, ERW pipes are formed without the need for any filler metal, and the weld seam is created through the application of electric current and pressure.
The ERW welding process ensures that the pipe has a strong, continuous weld joint with minimal defects. The process is highly efficient, making ERW pipes a cost-effective solution for many industrial applications.
Manufacturing Process of ERW Pipes
The typical ERW pipe manufacturing process involves the following steps:
Preparation of Steel Coils: High-quality hot-rolled or cold-rolled steel coils are selected based on the required mechanical and chemical properties.
Slitting: The coils are slit into the desired width depending on the pipe size.
Forming: The steel strip is passed through forming rolls that bend the edges gradually into a round shape.
Welding: The edges are heated using high-frequency electric resistance, and pressure is applied to forge the weld.
Weld Seam Removal: The internal and external weld bead is trimmed to create a smooth surface.
Heat Treatment: Pipes may undergo post-weld heat treatment to relieve stresses.
Sizing and Straightening: Pipes are sized to the required outer diameter and straightened.
Cutting and Finishing: Pipes are cut to the correct length and finished with end-facing and threading (if necessary).
Testing and Inspection: ERW pipes are tested for hydrostatic pressure, ultrasonic inspection, and dimensional accuracy to ensure compliance with standards.
Advantages of ERW Pipes
- High Dimensional Accuracy: The precise manufacturing process ensures tight tolerances and consistent wall thickness.
- Smooth Surface Finish: Ideal for applications requiring internal coating or fluid transportation.
- Cost-Effective: Lower production costs compared to seamless pipes.
- Versatile Applications: Suitable for structural, mechanical, and fluid-conveying systems.
- Quick Production: High-speed manufacturing makes them readily available for large projects.
Applications of ERW Pipes
ERW pipes are used in a variety of industries due to their strength and versatility:
1. Oil & Gas Industry
- Used in low-pressure oil and gas transportation pipelines.
- Ideal for casing and tubing in shallow wells.
2. Water and Sewage Systems
- Widely used in water transmission and distribution lines.
- Suitable for sewage and drainage applications.
3. Construction and Infrastructure
- Structural support columns and beams.
- Fencing, scaffolding, and handrails.
4. Automotive Sector
- Used in chassis and automotive frames due to their lightweight and strength.
5. Agriculture
- Used in irrigation systems, greenhouses, and water wells.
6. Engineering and General Fabrication
- Ideal for manufacturing machinery, conveyors, and heavy-duty frameworks.
Grades and Standards
API 5L Grade B x42
API 5L Grade B x46
API 5L Grade B X52
Api 5L Grade B x56
API 5L Grade B x60
API 5L Grade B x70
API 5L Grade B x80
API 5L SAW Pipe
ASTM A53 Grade A, B
ASTM A252
EN 10219
We offer ERW pipes in a variety of steel grades and adhere to international standards, including:
Common Standard & Grades
- ASTM A53 (Grade A & B)
- ASTM A252
- IS 3589
- API 5L (Grade B, X42, X52, X60, X70)
- EN 10219 (S235, S275, S355)
- BS 1387
- IS 1161
Standard Sizes
- Available in outer diameters ranging from 1/2″ to 24″ (21.3mm to 610mm).
- Wall Thickness: 1.2mm to 20mm
- Supplied in single random, double random, or custom lengths up to 12 meters per client’s requirements.
End Finish
- Plain End (PE)
- Beveled End (BE)
- Threaded & Coupled (T&C)
Quality Assurance
At Emirerri Steel, we maintain a rigorous quality control program throughout the production process. Each ERW pipe undergoes:
- Hydrostatic Testing
- Non-Destructive Testing (NDT)
- Ultrasonic Testing
- Eddy Current Testing
- Visual and Dimensional Inspection
Our facility is ISO-certified and follows stringent quality management systems to ensure that every pipe we deliver is of the highest quality and reliability.
Surface Coating and Protection
To ensure durability and resistance to corrosion, our ERW pipes are available with different surface treatments:
- Black (Bare)
- Galvanized (Hot-Dip or Electro-Galvanized)
- Painted or Epoxy Coated
- Offered with 3-Layer Polyethylene (3LPE) or 3-Layer Polypropylene (3LPP) coatings, ideal for oil and gas pipeline protection.
- Bitumen Coated (for underground water pipelines)
Why Choose Emirerri Steel?
- High Production Capacity: Capable of handling bulk and urgent requirements with consistent quality.
- Customization: We offer tailored solutions including different grades, sizes, and coatings.
- Global Supply: Efficient logistics to deliver anywhere in the world.
- Technical Expertise: Team of engineers and metallurgists ensuring the right product for your application.
- Customer Support: Transparent communication, documentation, and after-sales support.