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Pipe identification
Sep 06, 2016

1. fake steel pipes prone to collapse.

Folding steel surface of various lines, which often longitudinally throughout the product. Collapsed due to shoddy manufacturers high efficiency, reduction large, ear, arises when the next roll fold, folding will crack after bending, decline in the strength of steel.

2. Shoddy steel tubing looks pitted.

Voids are caused due to serious Groove wear irregular depressions on the surface defect of steel. Because of shoddy steel pipe manufacturers to profit, often rolling and rolling over.

3. Inferior surface is easy to produce scarring.

There are two reasons: (1). Shoddy steel tube material is uneven and impurities. (2). Shoddy materials manufacturers guide equipment became easier to steel, they bite rolls are easy to produce scarring.

4. Inferior surface is easy to crack, because its stock is Adobe, Adobe Air hole, Adobe in the cooling

Process due to the action of heat stress, cracks, after rolling on crack.

5. Shoddy steel easy to scratch because of shoddy steel pipe manufacturers equipment, susceptible to Burr, scratch steel. Deep scratches to reduce the strength of steel.

6. Shoddy steel non-metallic, pale red or color similar to cast iron, reasons 2.2, the billet is Adobe. 2, rolling temperature of shoddy standards, their temperature is by Visual inspection of steel, not be able to meet out the austenite area of rolling steel turn, not the performance standard.

7. Shoddy steel cross bars is thin and low, often filled with disgruntled because manufacturers reached minus tolerance, before the finished product under the pressure of a few large iron small type hollow filled with discontent.

8. Fake pipe cross-sectional surface of the oval, reason is manufacturers save material, finished before the roller under the pressure of two is too large, the steel strength decreases significantly, but does not meet the standards of rebar dimension.