Causes of pitting on the surface of seamless pipes
The pitting on the surface of seamless pipes is mainly caused by raw material problems, production process problems and improper surface treatment. The details are as follows:
1. Raw material problems: The forging and rolling raw materials of seamless pipes contain needle-shaped inclusions or other impurities. When the raw materials are processed into seamless pipes, these inclusions or impurities will be distributed in large quantities inside and on the surface of the pipe wall, thus forming pitting.
2. Production process problems: High heating temperature and irregular flame cutting during the production of seamless pipes will affect the quality of the pipe surface, thus causing pitting.
3. Improper surface treatment: When polishing the surface of seamless pipes, polishing process equipment, polishing materials and polishing cloths may cause pitting to varying degrees.
Treatment method for pitting on the surface of seamless pipes
Different treatment methods can be adopted for the pitting problems on the surface of seamless pipes caused by different causes, as follows:
1. Optimize raw materials: Select raw materials with high purity and few impurities, and strengthen oxidation-reduction treatment to better remove impurities in the raw materials.
2. Control the production process: The heating temperature should be strictly controlled during the production process to avoid excessive heating causing inclusions to precipitate; flame cutting equipment should be well maintained to ensure the flatness and smoothness of the cutting mouth.
3. Correct surface treatment: Select appropriate polishing materials and polishing cloths, perform appropriate mechanical treatment, and be careful not to over-polish to reduce the surface quality.
Conclusion
The pitting problem on the surface of seamless pipes will have a certain impact on production and use companies, so it must be taken seriously and handled in a timely manner. In actual operation, factors such as raw materials, processes and surface treatment should be fully considered, and effective measures should be taken to ensure the stability and reliability of the surface quality of seamless pipes.
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