Causes of cracks in seamless pipes (SMLS):

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, making it easy to crack.

2. Heat treatment problems

Heat treatment is an important link in the production process of seamless steel pipes. If the heat treatment is improper, it will also cause the steel pipe to crack. For example, during the quenching process, if the cooling rate is too fast or the temperature is too low, stress concentration will occur inside the steel pipe, causing cracking. In addition, if the tempering temperature is too low or the tempering time is insufficient, it will also affect the toughness of the steel pipe and make it easy to crack.

3. Processing problems

Seamless steel pipes also have the risk of cracking during processing. For example, during the perforation process, if the perforation speed is too fast or the perforation temperature is too low, cracks will appear on the surface of the steel pipe, causing cracking. In addition, if the pulling speed is too fast or the bending radius is too small, stress concentration will occur inside the steel pipe, causing cracking.

4. Environmental issues in use

Seamless steel pipes will be affected by environmental factors during use. For example, in harsh environments such as high temperature, high pressure, and corrosion, the corrosion and oxidation rates of steel pipes will accelerate, making them easy to crack. In addition, under the influence of natural disasters such as earthquakes and sandstorms, steel pipes may also crack or break.

Prevention methods for cracks in seamless pipes:

1. Pay attention to quality when purchasing materials

Pay attention to quality when purchasing materials and choose steel pipe materials manufactured by regular steel pipe manufacturers. And carry out necessary tests to ensure that the material quality is qualified and avoid cracks caused by material problems.

2. Defect detection must be strict

In the process of manufacturing seamless steel pipes, the defects of steel pipes must be strictly detected. Use high-quality testing equipment, such as ultrasonic flaw detection and radiographic flaw detection, to conduct a comprehensive inspection of the steel pipe and eliminate problems in the manufacturing process as much as possible.

3. Processing operations must be standardized

During the processing process, personnel with standardized operations and high technical levels must be trained, and high-quality processing equipment and tools must be used. For different types of steel pipes, different production processes and working parameters are used to avoid cracks caused by processing.

4. The use environment must be reasonable

When using seamless steel pipes, choose appropriate occasions and environments to avoid damage to the steel pipes, strengthen the inspection and maintenance of seamless steel pipes, and clean and repair them in time to avoid cracks caused by environmental problems.

5. Strengthen quality management

Manufacturers must strictly follow quality management specifications during the production process, strengthen quality control, inspection processes and records, promptly discover and correct problems, and ensure that the quality of the seamless steel pipes produced is stable and excellent.

Conclusion:
The generation of cracks in seamless pipes is related to many issues such as materials, steel pipe heat treatment, processing technology, and use environment. In order to prevent cracks in seamless steel pipes, manufacturers should start from materials, quality management, processing operations, etc., strengthen the quality management of the manufacturing process, and conduct all-round inspection and maintenance of steel pipes. At the same time, users should also pay attention to the scientific method and correct operation of seamless steel pipes to avoid cracks caused by damage to the steel pipes.