Brief Introduction for Physical Characteristics of Steel shots

- Sep 22, 2017 -

Chemical Composition:

Chemical composition is the most basic indicators of steel shot and steel grit, it will determine the steel shot, grit microstructure and the effect of heat treatment. Carbon (C) content should be moderate. Silicon (Si) manganese (Mn) can improve the strength and hardness of steel balls, to be as high as possible (not less than 0.8% for the best). Sulfur (S) phosphorus (P) is a harmful element, easy to make steel balls brittle, leading to premature rupture, should be as low as (<0.03% for the best).


If the steel shot or grit is too soft, will slow down the clean-up and reduce work efficiency. Shot peening, too soft steel balls can not produce a suitable residual stress, low hardness pill force can not be increased by increasing the impact time to compensate. Hardness is too high, will produce undesirable surface morphology, increase the probability of breaking the projectile, so that consumption is too high, and the equipment wear and tear, increase equipment maintenance costs, so the appropriate hardness is also critical


The microstructure of the steel shot (sand) must be able to resist deformation and reduce the energy loss by increasing the fatigue life when acting on the working face. Tempered martensite is the most resistant to fatigue, in addition, microstructure microstructure must reduce the fragile carbide, otherwise it will cause the steel shot (sand) premature rupture, increase the use.

Physical Defects:

Steel balls (sand) must be as little as possible to cause physical defects that can cause abrasive rupture. Due to the use of the production process, steel balls (sand) there will always be some such physical defects. Production must be the corresponding process to control, reduce the proportion of defect particles.

Fatigue life:

Fatigue life is the ability to resist crushing when the steel shot (sand) acts on the working surface. The abrasive with the longest fatigue life will be the most economical abrasive if it can convert the appropriate energy into the cleanup.