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The following misunderstandings should be paid attention to in the purchase of steel shot:

Whether the appearance of steel shot is darker, brighter and of better quality

　　Fact: the darker and brighter the appearance of the steel shot, the higher the heat treatment temperature in the production process, resulting in the reduction of carbon content in the steel shot in the production process. As a result, the hardness of the steel shot becomes lower, and the steel shot is easy to deform in the process of impact.

　　Conclusion: the darker and brighter the appearance of steel shot, the more "useless"

Is recycled steel shot (called "recycled shot") effective?

　　In fact, the recovered pellets are more resistant to beating than the new steel pellets, but the source of the recovered pellets is not uniform, and they are recovered from the alloy steel pellets, steel wire cutting pellets and other kinds of steel pellets, so the composition is not uniform, the particle size is not uniform, which seriously affects the gloss and roughness of the workpiece after being hit.

　　Conclusion: due to unknown source, it is better to be cautious.

So how to check the quality of steel sand?

Microstructure

　　When the microstructure of steel shot acts on the working face, it must be able to resist deformation, reduce energy loss, increase or reduce fatigue life. Tempered martensite is the most resistant to fatigue. In addition, the number of brittle carbides in the microstructure must be reduced, otherwise the steel shot will crack prematurely and the usage will increase.When the microstructure of steel shot acts on the working face, it must be able to resist deformation, reduce energy loss, increase or reduce fatigue life. Tempered martensite is the most resistant to fatigue. In addition, the number of brittle carbides in the microstructure must be reduced, otherwise the steel shot will crack prematurely and the usage will increase.

Chemical composition

　　Determine the microstructure of steel shot and the effect of subsequent heat treatment. The carbon content should be moderate. Silicon and manganese can improve the strength and hardness of steel shot, so it should be as high as possible. Sulfur and phosphorus are harmful elements, which are easy to cause brittleness of steel sand and premature cracking. They should be as low as possible.

Fatigue life

　　Fatigue life is the ability of steel shot to resist extrusion when it acts on the working surface. If the proper energy can be converted to clean, the abrasive with the longest fatigue life will become the most economical abrasive.

Physical defects

　　The shot must contain as few physical defects as possible that may cause wear and cracking. Due to the adopted production process, the steel shot always has certain physical defects. In production, there must be corresponding procedures to control and reduce the proportion of defective particles.