How to distinguish the quality standards of steel grit

　　Steel grit is often used to treat metal surfaces. Products treated with steel grit can meet national standards. At present, steel grit is the most advanced and ideal high-quality material for cleaning, blasting, rust removal and strengthening at home and abroad.

　　High-quality steel grit products have moderate hardness, strong toughness, and impact resistance. They can be used repeatedly for several times in a row. They also have long service life, good rebound, strong adhesion, fast cleaning speed, low sand consumption, no breakage, and bright workpieces to be cleaned. Good technical effects and many other features.

　　Of course, this is the advantage of high-quality steel grit. The treatment effect of inferior steel grit is greatly reduced. So how to test the quality of steel grit? Zouping Jinyu Abrasive Co., Ltd. tells you several standards. You can start from the following make judgments.

　　1. Hardness. If the steel grit is too soft, it will slow down the cleaning speed and reduce work efficiency. During sandblasting strengthening, steel sand that is too soft cannot produce 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, cause excessive consumption, cause greater wear and tear on the equipment, and increase equipment maintenance costs. Therefore, appropriate hardness is also critical.

　　2. Metallographic structure. The microstructure of the steel grit must be able to resist deformation and reduce energy loss and increase fatigue life when acting on the working surface. Tempered martensite is the most fatigue-resistant. In addition, brittle carbides must be reduced in the microstructure, otherwise it will cause premature rupture of steel grit and increase usage.

　　3. Chemical composition. Determines the microstructure of steel grit and the effect of subsequent heat treatment. 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 that can easily make steel grit brittle and lead to premature rupture, so they should be as low as possible.

　　4. Fatigue life. Fatigue life is the ability of steel shot grit to resist breakage when it acts on the work surface. The abrasive with the longest fatigue life will become the most economical abrasive if it can convert appropriate energy into cleaning.

　　5. Physical defects. Steel grit must contain as few physical defects as possible that can cause the abrasive to break. Due to the production process used, steel grit will always have certain physical defects. Corresponding processes must be controlled during production to reduce the proportion of defective particles.