Steel grit testing standard

　　Steel grit is the most commonly used metal abrasive for shot blasting machines. Widely used in machining, anti-corrosion treatment and other fields. So what are the steel sand testing standards?

　　1. If the steel grit is too soft, it will slow down the cleaning speed and reduce the work efficiency. During sandblasting, too soft steel grit cannot generate suitable residual stress, and the force of low-hardness sand cannot be compensated by increasing the impact time. If the hardness is too high, it will produce an unsatisfactory surface morphology, increase the probability of sand breakage, make the consumption too high, and wear more equipment and increase equipment maintenance costs, so proper hardness is also critical.

　　2. The carbon content should be moderate. Silicon and manganese can improve the strength and hardness of steel grit, so it should be as high as possible. Sulfur and phosphorus are harmful elements, which are easy to make steel grit brittle and lead to premature rupture, so they should be kept as low as possible.

　　3. The microstructure of steel grit can resist deformation, reducing energy loss and increasing fatigue life when acting on the working face. Tempered martensite is more resistant to fatigue. In addition, brittle carbides need to be reduced in the microstructure and microstructure, otherwise it will cause premature fracture of steel grit and increase consumption.

　　4. Fatigue life is the ability of steel grit to resist crushing when it acts on the working surface. Abrasives with longer fatigue life will be economical abrasives if they can convert proper energy into cleaning.

　　5. Due to the production process used, there will always be certain physical defects in the steel grit. Corresponding processes must be controlled in production to reduce the proportion of defective.