Improper steel shot selection will affect the normal operation of the shot blasting machine and may also cause machine failure. The commonly used steel shot for shot blasting machine are Steel wire cutting shot , alloy shot, cast steel shot Caltrop sand 、 Stainless steel shot , aluminum shot, etc. Customers who use shot blasting machine want to find suitable steel shot and select the steel shot with good quality, which can not only improve the service life of the shot blasting machine and its vulnerable parts, but also improve the surface quality of the product. In general, the type and size of steel shot are mainly determined by the workpiece you want to clean: aluminum shot or stainless steel shot is generally used for non-ferrous metal; Steel shot shall be used for ordinary steel and its weldments, castings, steel, etc; The larger the steel shot diameter is, the higher the surface roughness after cleaning is, but the cleaning efficiency is also high; The cleaning efficiency of irregular shaped steel sand or steel wire cutting shot is higher than that of spherical shot, but the surface roughness is also higher; The projectile with high cleaning efficiency also wears the equipment quickly (relatively), which is only calculated by using time, but is not fast compared with production efficiency.

a) The hardness is proportional to the cleaning speed, but inversely proportional to the service life. Therefore, the hardness is high, the cleaning speed is fast, but the service life is short and the consumption is large, so the hardness should be moderate (about HRC40-50 is appropriate) and the use effect is good.

b) Moderate hardness and excellent resilience enable the steel shot to reach every part of the cleaning room, reducing the processing time.

c) The internal defects of projectiles, such as air hole cracking and shrinkage cavity, can affect their service life and increase consumption.

d) If the density is greater than 7.4g/cc, the internal defects will tend to be small.

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