How to chose steel shot hardness?

The hardness of the steel shot is directly proportional to the cleaning efficiency of the steel shot.

 The higher the hardness, the faster the cleaning speed, because the steel shot will bounce multiple times after being thrown onto the surface of the workpiece, so that a shot will be hit many times, but At the same time, the life of the steel shot will be shortened and the consumption will increase. High-hardness steel shots will hit deeper on the surface of the workpiece, but the steel shots will be easily broken. Excessive hardness will also damage the workpiece and cause excessive cleaning. The steel shot with too low hardness is inefficient, because the rebound performance of the steel shot is reduced, the cleaning effect is also slightly worse, and it takes a longer cleaning time to achieve a rational effect. 

The advantage is that the workpiece is protected from the steel shot. Breaking consumption, selecting the steel ball of suitable hardness will take both into consideration, which not only improves the working efficiency, but also reduces the cleaning effect and the wear of the shot blasting machine and the wear of the shot blasting machine.