ERW (Electrical Resistance Welding) pipes are manufactured by cold forming of steel coil into a round cylindrical shape are used in various engineering purposes.

ERW steel pipe is formed by rolling plate and welding the seam.

Features of ERW pipe

Low cost: the low raw material cost and manufacturing cost make it prices more competitive than longitudinal seam submerged-arc welded pipes and seamless pipes.

High Weld Seam Security: As a result of special welding method of melting parent metal together, without filler metal, the weld property is better than submerged-arc welded pipes; and the weld seam is much shorter than spiral seam welded pipes, the seam security is greatly improved.

Wide Range: ERW pipes can be applied with a wide range of thickness / diameter ratio, covering hundreds of specifications.

ERW Welded Steel Pipe Type

ERW welded steel pipe, ERW Hollow steel pipe, blank iron pipe, Ms welded steel pipe, ERW welded hollow pipe, EFW steel pipe, Longitudinal EWR pipe, HFW Steel line pipe, HFW steel pipe

ERW Welded Steel Pipe Production process

ERW Welded Steel pipe specification:

Outer diameter: 1/4”-26” (13.7mm-660.4mm).
Wall thickness: 10mm-100mm.Length: 3m-14m

Surface: oiling, spraying black paint ( or varnish), galvanized, 3PE, FBE epoxy anti-corrosion coating etc.

ERW Welded Steel Pipe Application

Widely used in industry, chemical industry, construction, water treatment, agricultural irrigation, highway billboards, fire fighting , bridge supporting , gas & oil conveying, mine and oilfield drilling.

ERW Welded Steel Pipe Inspection

hydrostatic testing, ultrasonic testing, eddy current testing, magnetic particle testing, impact testing, hardness testing, etc.

ERW Welded Steel Pipe Package and storage

Safe and Seaworthy packing suitable for export; As per customer’s requirement.

ERW welded steel pipe quality inspection:

1. Our factory has its own "experimental testing center".CNAS Laboratory Accreditation Certificate

2.Control quality strictly.The first pass is the quality inspection on the production line,The second pass is full inspection of the  production quality .

3.We have got internationally recognized certificates, ISO, CE, LR,Philippine certificate,also support third-party testing,as SGS, BV, etc.

ERW Welded Steel Pipe feature

High-frequency resistance welding steel pipe, welding pipe and ordinary welding process is not the same, the weld is made of the base metal melt from the body, the mechanical strength is better than the general pipe. Smooth appearance, high precision, low cost weld high and small, favorable 3PE anti-corrosion coating. There are significant differences in the welding methods between high frequency welded pipe and submerged arc welded pipe. As the welding is done instantly at high speed, the difficulty of ensuring the quality of welding is much higher than that of submerged arc welding.

ERW Welded Steel Pipe is used to transport oil, natural gas and other gas-liquid objects, which can meet various requirements of high and low pressure, and occupies a pivotal position in the field of transport pipes in the world. ERW straight seam welded pipes are divided into low frequency welding, intermediate frequency welding, super intermediate frequency welding and high frequency welding according to different frequencies. High-frequency welding is mainly used for the production of thin-walled steel pipes or ordinary thick-walled steel pipes, and high-frequency welding is divided into contact welding and induction welding.

ERW Welded Steel Pipe has the advantages of using hot-rolled coils as raw materials, and the uniform wall thickness can be controlled at about ±0.2mm. The two ends of the steel pipe are according to the American APl standard or GB/T9711.1 standard. Goods and other advantages. In recent years, various natural gas pipeline network projects and gas companies have widely adopted ERW steel pipes as the main steel pipes of urban pipeline networks.