How to identify inferior special-shaped seamless pipes

Special-shaped seamless steel pipes play a vital role in urban construction. Its quality directly affects the firmness and quality of living buildings. Inferior special-shaped seamless steel pipes have the following characteristics:

1. The surface is not smooth

Due to the raw materials used, poor steel rolling equipment, unprofessional technical techniques and low cost, inferior special-shaped seamless steel pipes will have surface folding, pitting, scarring, cracks, and easy scratches. Generally, this situation can be found by naked eye observation.

2. No metallic luster on the surface

Some inferior special-shaped seamless steel pipes are made of adobe, and the temperature is not standard. The steel temperature is grasped by visual inspection, so that the rolled steel pipe will appear light red or the color of pig iron, without the metallic luster of the genuine pipe.

3. Unevenness of cross-section and cutting head

In order to save raw materials, some steel pipe factories use too much reduction in the first two passes of the finished roll, resulting in an elliptical cross-section, and the cut-off section of inferior special-shaped seamless steel pipes often has meat loss, that is, unevenness. Therefore, once it is found that the cross-section of the special-shaped seamless steel pipe is oval, and the cut head is uneven, everyone should be vigilant. This is a poor-quality special-shaped seamless steel pipe.

4. Unacceptable size and weight

Generally, the size of inferior special-shaped seamless steel pipes fluctuates greatly, and in order to save raw materials, most of them are not enough in weight. Therefore, when purchasing special-shaped seamless steel pipes, you can check the steel pipe standards and sizes in advance, and you can ask for accurate special-shaped seamless steel pipe sizes and weights when viewing samples.