What level of surface smoothness does the pipeline achieve after Dalian shot blasting processing?

Dalian shot blasting is a widely used process for metal surface treatment. Through the high-speed impact and cutting action of abrasives, the surface quality of workpieces can be comprehensively cleaned and improved. Shot blasting plays an important role in workpiece manufacturing, repair, and maintenance. However, it also has some shortcomings and limitations that need to be selected and considered in practical applications. With the development and updating of technology, shot blasting processing will be further developed and improved.

Shot blasting processing can select appropriate shot blasting methods based on different needs and material characteristics. Common shot blasting methods include pressure shot blasting, centrifugal shot blasting, and suction shot blasting. Pressure shot blasting is a common method that uses compressed air or high-pressure water flow to accelerate the shot blasting particles and clean and strengthen the metal surface. Centrifugal shot blasting is the process of projecting shot blasting particles onto a metal surface through centrifugal force, suitable for workpieces with complex shapes. Shot blasting is the process of placing a metal workpiece into a closed chamber and generating negative pressure within the chamber. The metal surface is treated by the flow of shot blasting particles within the chamber.

What level of surface smoothness does the pipeline achieve after Dalian shot blasting processing?

According to the international standard ISO 8501-1, the surface smoothness of pipelines can be classified into the following levels:

Sa level 1: to a lower level, with a large amount of residual dirt, rust, oxides, etc. on the surface, and no obvious gloss;

Sa level 2: The surface has been cleaned of most of the dirt, rust, and oxides, but there are still some residues with a slight gloss;

Sa 2.5 level: The surface is basically clean, without obvious dirt, rust, and oxides, and has good luster;

Sa level 3: highest level, completely clean surface, free of any dirt, rust, and oxides, with good gloss.

In practical applications, the specific level of smoothness chosen depends on the usage requirements and actual situation of the pipeline. For example, for pipelines with high requirements, such as those in industries such as food, medicine, and chemical engineering, it is generally required to achieve a smoothness of Sa 2.5 or above to ensure the hygiene and stability of the pipeline surface; For some industrial pipelines with general requirements, such as those for conveying liquids, gases, and other industries, a smoothness of Sa 2 level is generally sufficient to meet the requirements.

The shot blasting processing equipment mainly consists of shot blasters, collectors, conveyor belts, dust collectors, etc. The shot blaster is the core component that drives the impeller to rotate through an electric motor, generating centrifugal force and projecting abrasive onto the surface of the workpiece. The collector is used to collect and recover abrasives, while the conveyor belt is used to transport workpieces from one location to another. Dust collectors are used for cleaning and treating the generated dust.

The advantages of shot blasting processing are mainly reflected in the following aspects. Shot blasting processing can efficiently remove various surface pollutants, such as oxide film, welding slag, shovel rust, etc. Secondly, shot blasting can significantly improve the hardness and wear resistance of metal surfaces, and increase the service life of parts. Again, shot blasting can to some extent improve the roughness of the metal surface and enhance surface quality. Shot blasting can provide better adhesion for subsequent surface coatings and improve the service life of coatings.