1. fake and square tube readily from folding. Folding square tube surface formed 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. Fake and square tube looks often pitted. Voids are caused due to serious Groove wear irregular depressions on the surface defect of steel. Due to the fake side pipe manufacturers to pursue profit, often rolling and rolling over.
3. Inferior surface is easy to produce scarring. There are two reasons why:
(1). Fake tubes are not uniform, and impurities.
(2). Shoddy manufacturers of guide equipment became easier to steel, these impurities
4. Inferior surface is easy to crack, because its stock is Adobe, Adobe Air hole, Adobe in the process of cooling due to the action of heat stress, cracks, after rolling on crack.
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