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Welcome to Steclo International...Mfrs. of ERW Precision Steel Tubes and Pipes , Cold Rolling, Railway Track Elastic Fasteners, Railway Wagon Suspension Shackles,  Forging and Casting, Hot Galvanizing, Packing Colored Strip, Over Head Equipments, Drop Wire Accessories(New Type), Push Button Telephones, PCC Poles, All types of Telecommunication Products... An Iso 9002 Certified Suppliers..
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Welcome to Steclo International...Mfrs. of ERW Precision Steel Tubes and Pipes , Cold Rolling, Railway Track Elastic Fasteners, Railway Wagon Suspension Shackles,  Forging and Casting, Hot Galvanizing, Packing Colored Strip, Over Head Equipments, Drop Wire Accessories(New Type), Push Button Telephones, PCC Poles, All types of Telecommunication Products...
manufacturing process  of ERW Precision Steel Tubes...

After the steel strip is cold rolled, finished and oiled (see section on Cold Rolling) the coil enter the ERW Mill for tubemaking.

 
Strip is feed into ERW Mill...  
 
uncoiling...  
 
flash welding...
 

Strip edges are first flattened on a leveller and the ends cut square by an upcutting shear. Coil ends are then flash welded to form a continuous length. The piece of tube with the crossweld par is scrapped later.

stripping...  
The extra metal formed after flash welding is removed by a stripper.
looping...  

A large loop is formed between the flash welder and forming mill to operate continuously even if the strip is stopped during flash welding.

edge trimming...  

The strip edges are now trimmed to the exact width required and to ensure the cleanest possible surface for selding.

forming..  

The strip then enters a series of contour rolls which bend it progressively upwards into a cylindrical form with the edges abutting.

welding...  

The abutting edges are welded together electrically. An induction coil surrounds the tube at a distance upstream of the weld rolls. A high frequency current is induced into the strip and flows along the edges of the strip between the point where the edges meet and the point of application or induction of the current. It establishes a complete circuit by flowing around the edges of the open 'V' up to the point at which metal to metal contact is first made. At the weld point the 3-squeeze-roll assembly presses the edges together with a controlled pressure and shapes the tube to a welded form. The result is a strong and consistent forged weld.

bead trimming..  

After welding a bead is formed inside and outside the tube along the line of the weld. the outside bead is immediately removed while the tube is still fairly hot, by a set of cutting tools. The inside bead is removed (in the case of boiler and mechanical tubes) by suitable bead trimmers.

sizing...  

The tube passes through a series of sizing rolls to ensure an accurate outside diameter.

cutting...  

As the tube emerges from the sizing stands, the Alpha shear, without stopping the tube, cuts it to the required length.

normalising...  

Where tubes are required for high temperature, high pressure applications they are sent for normalising in a controlled atmosphere furnace to relieve stresses and ensure a homogeneous grain structure.

inspection...  

Various physical tests are performed on specimens of cut lengths to ensure that the tubes meet the requirements specified by the customer.

finishing...  
 

Straightening, end treatment, hydraulic testing, final inspection and application of protective coating.

   
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