1. Fake thick-walled seamless pipe prone to folding. Folding is a variety of fold lines formed on the surface of thick-walled seamless steel pipe, this defect often runs through the longitudinal direction of the entire product. The reason for folding is due to the pursuit of high efficiency fake manufacturers, the reduction is too large, resulting in ears, the next roll when folding, folded product will crack after bending, thick seamless steel pipe strength decreased .

2. Counterfeit thick-walled seamless steel pipe appearance often have Ma phenomenon. Ma surface is due to a serious groove wear caused by irregular thick irregular steel tube surface defects. As the fake thick-walled seamless steel pipe manufacturers to the pursuit of profit, often appear the most excessive rolling groove.

3. Fake thick-walled seamless steel pipe surface easy to produce scarring. There are two reasons: 1. Fake thick-walled seamless steel pipe material is uneven, more impurities. 2. Scattered and poor manufacturers guide equipment manufacturers simple, easy to stick steel, these impurities bite roll easy to produce scarring.

4. Fake and shoddy surface easy to crack, because it is the adobe billets, adobe stomatal, adobe in the cooling process due to the role of thermal stress, cracks, after rolling there are cracks.

5. Fake and thick-walled seamless steel pipe easy to scratch, the reason is shabby hardware manufacturers simple, easy to produce burrs, scratched thick-walled seamless steel pipe surface. Deep scratching reduces the strength of thick-walled seamless steel tubes.

6. Counterfeit thick-walled seamless steel pipe horizontal bars thin and low, often appear dissatisfied with the phenomenon, the reason is that manufacturers to achieve large negative tolerance, the first few Road, the finished product is too large, iron is too small, filling hole dissatisfied.

7. High-quality thick-walled seamless steel pipe composition, cold clippers tonnage high, cut end face smooth and neat, and inferior material due to poor quality, cut end face often have the phenomenon of meat, that is uneven, and no Metallic luster. And because of inferior products manufacturers cut less head and tail will appear big ears.