1. The surface layer of fake and shoddy alloy steel pipe is easy to stretch;

2. Its surface will also be very easy to cause scab;

3. The surface layer is very easy to cause cracks, scratches and burrs;

4. In addition, the fake and shoddy alloy steel pipe has no metal texture, and is dark red or similar to the color of pig iron;

5. The section of fake and shoddy alloy steel pipe is irregular, oval, and its transverse reinforcement is thin and low. It will continue to be unsatisfactory, and the longitudinal reinforcement is often wavy;

6. The raw materials used in fake and inferior alloy steel pipes are relatively poor, which will often cause meat loss in the inner hole of the cutting head, and the inner hole of the cutting head is uneven;

7. The applied material residue is more, and the density of steel is small, the specification deviation is serious, and the inner diameter specification fluctuates greatly.