ERW welding round pipes also are called as Electric Resistance Welded Pipes.This type of steel pipes and tubes are widely used in various fields such as engineering purposes, fencing, scaffolding, line pipes etc. ERW steel pipes and tube are available in various qualities, wall thicknesses, and diameters of the finished pipes.
While manufacturing ERW steel pipes, there are some strictly standard: high-quality, continuous-cast, fully killed, control-rolled, fine-grain, low-carbon steel. High performance ERW steel pipes and tubing possess high strength corrosion resistance, high deformability, high strength and high toughness.
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 steel pipes and tubes. ERW pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc.
※ERW welding steel pipe is available in lengths from single random to 120 feet depending on mill capability.
※ERW welding steel pipe is available with square ends or beveled for welding, threaded and coupled and victaulic grooved.
※Surface finish are available in black or bare, or with protective coatings.
Available specification sheet for CUSTOMERS
Steel Grade Sheet:
※ ERW line pipe– for the transportation of oil, natural gas and chemical materials
Standards: AP-5L PSL1/ PSL2 GB/T9711.1-1997 GB/T9711.2-1999Steel
※ ERW Casing pipe–petroleum and nature air exploration
Standards: API SPEC 5CT, SY/T5989
Materials ：H40 J55 K55
※ Structure and Mechanical Roundpipe and Tubing
Standards: JIS3466、JIS3445; ASTM A513; GB/T 6728-2002
ERW Welding Pipe Process You must Know
The main produce processes of ERW steel pipes is: strip is fed into a set of forming rolls which consists of horizontal and vertical rollers so placed as to gradually from the flat strip in to a tube which is then allowed to pass the welding electrodes. The electrodes are copper disks connected to the secondary of a revolving transformer assembly.
HR Coils are slitted to pre-determined widths for each and every size of pipes
Uncoiling,End Shearing And Welding:
The slitted coil is uncoiled at the entry of ERW mill and the ends are sheared and welded one after another. This results in a single endless strip.
The slitted coils are initially formed into U shape and after that into a cylindrical shape with open edges utilizing a series of forming rolls.
In this stage, the open edges are heated to the forging temperature through high-frequency, low-voltage, high current and press welded by forge rolls making perfect and strong but weld without filler materials.
In this stage, the weld flash on top and inside (if required) is trimmed out using the carbide tools.
If required, the welding portion and heat affected zone is put to normalizing and then are cooled down in a air cooling bed.
After water quenching, slight reduction is applied to pipes with sizing rolls. This results in producing desired accurate outside diameter.
In cutting stage, the pipes are cut to required lengths by flying cut off disc/saw cutter.
End Facing And Bevelling:
This is usually stage, where the pipes ends are faced and bevelled by the end facer. All these processes are continuous with automatic arrangements. These plain ended tubes further go for processing as per the customer requirements such as galvanizing, threading, black varnishing and more.
Quality Control :
We own complete detection devices for chemical composition analysis and mechanical properities test , and own laboratory.