1. Material problems
Seamless steel pipes are made by perforating steel billets, so the quality of the material has a crucial impact on the quality of the steel pipe. If there are quality problems with the steel billet, such as uneven composition and high impurity content, cracking will occur during the perforation process. In addition, brittle inclusions and carbide segregation contained in the material will also affect the toughness of the seamless steel pipe and make it easy to crack.

2. Heat treatment
The heating temperature and time cannot guarantee whether the heat treatment of the steel pipe is in place, which will also affect the toughness of the steel pipe and make it easy to crack.

3. Straightening force
During the straightening process, excessive straightening force will also cause internal injuries and cracks in the steel pipe. In the later stage, there is no flaw detection and it is directly packaged and shipped. This is also the reason for the cracking of the steel pipe in the later stage.

4. Tensile deformation
If the drawing deformation is too large, cracks will also form on the steel pipe, causing cracks in the steel pipe during post-processing.

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