Causes of seamless steel pipe surface defects
In the production process of
seamless steel pipe, the problem of surface defects often occurs, which is closely related to its material, production process, processing environment and other factors. The following are some common causes of defects:
1. Raw material problem
When selecting raw materials, there is no deep inspection of raw materials, resulting in non-metallic impurities or other impurities in raw materials, resulting in cracks, dents and other defects on the surface of the steel pipe during processing. Or the composition of raw materials is not evenly distributed, resulting in inconsistent mechanical properties in various parts of the processing, resulting in poor defects.
2. Improper heating process control
In the process of heating the raw material, the raw material is not heated to the rated temperature, resulting in uneven heat on the surface of the steel pipe during the rolling process, resulting in cracks and so on.
3. Rolling process problems
When the billet is perforated, if the center of the perforation is offset, it may cause cracks or pitting on the surface of the steel pipe. In the rolling process, if the steel pipe is stressed unevenly, it will also lead to cracks and other defects on the steel pipe surface.
4. Improper heat treatment
During the quenching process, if the temperature is not properly controlled or the cooling method is not correct, it may lead to cracks and depressions on the surface of the steel pipe.
5. Improper transportation
During transportation, the surface of the steel pipe may be subject to collision and friction, resulting in dents or scratches on the surface of the steel pipe.
In summary:
The defects caused by the surface of seamless steel pipe are mainly related to the quality of raw materials and errors in the processing process. Through strict control of the production process, strengthening the maintenance of equipment and standardizing the operating process of equipment, the defects will be greatly reduced.