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QUALITY

Home » QUALITY

 

Quality Control and Produce Processes

As a purchaser of steel products,the most important point must be the quality.So we show some quality inspection and produce processes.Also we can accept the third party inspection such as SGS or TUV.


 

※ SSAW/HSAW steel pipe

We have purchased scientific test equipment for ssaw steel pipe.

  • - spectrometer
  • - metallographic
  • - universal testing machine   
  • - charpy impact test machine
  • - offline ultrasonic automatic flaw detector 
  • - X-ray real time imaging system
  • - 2000t hydrostatic pressure testing machine

ssaw pipe test


 

※ LSAW steel pipe

In the LSAW type, steel coils are welded spirally, like a helix, so that the coil (strip) assumes the shape of a pipe. SAW pipes are used mainly in oil and gas transportation. On the other hand, seamless (non-welded) pipes are mainly application in oil and gas exploration projects.There are several technique to produce LSAW steel pipe,such as UOE,JCOE,RBE and so on.But the main method is UOEtechnique.

lsaw steel pipe


 

 

※ ERW black SHS & RHS pipe

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.

- Slitting:

HR Coils are slitted to pre-determined widths for each and every size of pipesUncoiling,

- 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.

- Forming:

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.

- Welding:

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.

- De beading:

In this stage, the weld flash on top and inside (if required) is trimmed out using the carbide tools.

- Seam Annealing:

If required, the welding portion and heat affected zone is put to normalizing and then are cooled down in a air cooling bed.

- Sizing:

After water quenching, slight reduction is applied to pipes with sizing rolls. This results in producing desired accurate outside diameter.

- Cutting:

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.



 

※ Hot dipped galvanized steel pipe

Supply the best hot dipped galvanized round steel pipe for our customers,our factory have 3 production lines with advanced equipment.

hdg pipe


 

 

※ Pre-galvanized steel pipe

The zinc coating on the steel sheet shall conform to ASTM A525 Grade G60 and G120. The exterior and interior surface shall have a combined zinc weight ranging from 0.60 oz/sq ft (or 0.45 oz/sq ft each side) to 1.20 oz/sq ft (or 0.60 oz/sq ft each side). These coating weights do not apply to the inside welded area.

pre galvanized pipe


 


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