Sandblasting and shot blasting are two common surface treatment methods for steel plates. Both methods involve using high-pressure particles to remove impurities from the surface of the steel, but there are several differences between the two methods.

 

Similarities:

 

1. Both methods use high-pressure particles to remove impurities from the surface of the steel, such as rust, scale, and old paint.

 

2. Both methods can improve the surface roughness of the steel, which can enhance its adhesion to coatings or paints.

 

Differences:

 

1. Sandblasting typically uses sand or other abrasives as the blasting media, while shot blasting uses steel shots. Sandblasting has a wider range of media readily available and can offer better control over the blasting media.

 

2. Shot blasting is generally the more aggressive method and can achieve a higher level of cleanliness and roughness compared to sandblasting. However, shot blasting can be more expensive and time-consuming.

 

3. Sandblasting can be more suitable for delicate workpieces that require lower intensity surface treatment.

 

4. Shot blasting can leave residue on the surface of the steel if the media is not cleaned properly. This can lead to a reduction in coating adhesion.

 

Advantages and disadvantages:

 

Sandblasting:

 

Advantages:

- Can achieve a good surface roughness for coatings adhesion.

- Suitable for delicate workpieces.

- Relatively low cost.

 

Disadvantages:

- Not as effective in removing heavy rust.

- Can cause damage to the surface if the blasting intensity is too high.

 

Shot blasting:

 

Advantages:

- Achieves a higher level of cleanliness and roughness.

- Ideal for larger and more heavily rusted steel plates.

- Media can be recycled, reducing waste.

 

Disadvantages:

- More expensive and time-consuming.

- Can leave residue on the surface if not cleaned properly.

- Requires more advanced equipment.

 

In summary, sandblasting and shot blasting are both effective methods of surface treatment for steel plates, but they differ in terms of the media used and their effectiveness in achieving a high level of cleanliness and roughness. The choice of method largely depends on the specific requirements of the project, such as the level of impurities on the steel surface, the size and delicacy of the workpiece, and the budget/time constraints.