CR/HR Slitting lines for ERW Pipe Mill

CR/HR Slitting lines

CR/HR Cut-to-Length Lines

For stainless steel welded tubes manufacturer

Stainless Steel Coil Manufacturer and Dealer

ERW pipe mill Oman

ERW pipes and tubes stands for Electric Resistance Welded pipes and tubes, the rectangular strip are fed through a rolling machine that curls the longer sides up toward one another, forming a cylinder. In the ERW process, high-frequency electrical current is passed between the edges, causing them to melt and fuse together, welding it longitudinally across its length, an advantage of ERW pipe is that no fusion metals are used and the weld seam cannot be seen or felt.

Welded pipe manufacturing techniques have improved over the years. Perhaps the most important advancement has been the switch to high-frequency electric currents for welding. Prior to the 1970s, low-frequency current was used. Weld seams produced from low-frequency ERW were more prone to corrosion and seam failure.

While manufacturing ERW steel pipes, only high-quality, continuous-cast, fully killed, control-rolled, fine-grain, low-carbon steel is used. High performance ERW steel pipes and tubing possess high strength corrosion resistance, high deformability, high strength and high toughness.

ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc. Our ERW pipe is available in lengths from single random to 46 foot depending on mill capability. ERW tube is available with various quality in square, rectangular round shaped, in addition Pre-galvanized pipe/tube with offering large combination of thickness as well. Based on the customers’ requirements we can manufacture ERW pipes and tubes of different size and shape. We have a very large production capacity of ERW pipes and tubes with an area of 45000 sq. Meters.

We are among the leading manufacturers and suppliers of ERW pipes and tubes in Oman. We are also one of the largest exporters of ERW pipes and tubes in Oman, In addition we are dealing with variety of steel sheets, Z-Purlin, C-Purlin etc.

Pipe manufacturing methods

There are 2 main Pipe Manufacturing Processes involving Welded and Seamless pipes. Each of these processes employ different techniques to produce the pipes depending on the ultimate usage for which the pipe is being designed for as indicated in the diagram below.

Each of the techniques used produce pipes with varying degree of diameters, thickness, tolerance and mechanical properties to suit the demands of the customer. The chart below indicates the limitations for each of the above processes:

Electric resistance welded pipe (ERW)

International Pipe Industry LLC uses the High frequency electric resistance welding process to manufacture pipes ranging in nominal diameter from 168.3 mm (6 inch) to 610 mm (24 inch), and in wall thickness from 4,0mm (0,118 inch) to 25.4 mm (1,00 inch).

Side trimming and Edge milled steel strip is mechanically formed into pipe. There are two break down rolls to make a round shape and feed the strip into cage forming stand. After passing three fin pass stand, a high-frequency electrical current is applied to fuse pipe skelp to form a weld. Unlike the arc-welding process no filler material is added. The weld becomes a homogeneous part of the completed pipe. The welding facilities are equipped with diagnostic system to control and show the all information of operating such as cooling water circulation, input & output voltage, power consumption, and all the weld parameters.

In order to ensure completely smooth pipes, welds are trimmed both internally and externally. Immediate confirmation of welds is assured as pipes pass through a multi-probe ultrasonic inspection system located after the welding and trimming stations.

Following ultrasonic assessment, weld joints are induction heated to normalize the metallic structure of the weld. Seam Normalising calls “N” process also improves toughness of the steel in the region and significantly decreases the weld line corrosion effect.

After air cooling, the pipe goes to water cooling stand to reduce the temperature of weld seam. Prior to hydrostatic testing, pipes are sized to required tolerances before being cut to length and the ends beveled. Weld seams are again ultrasonically tested for not only weld seam but also full body lamination upon client requirements.

Pipes are inspected, weighed and can be varnished and marked prior to final inspection and dispatch, or transferred to the coating plant to continue FBE and 3 Layer PE/PP coating for corrosion protection treatment.

When required, pipe is threaded and coupled at the mill. Couplings are automatically made-up to position with position/torque capability. After coupling make-up, the pipe is transferred to an automatic drift station.

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