Steel shot is often used in metal surface treatment, through steel grit processing products, can meet the national standard. Steel shot is one of the commonly used abrasive, USES the selection of raw materials made from scrap. Steel shot is currently at home and abroad ideal cleaning blast, rust removal and strengthen of quality materials. Product of high grade steel shot have moderate hardness, toughness, impact resistance, can be used repeatedly for several times, at the same time, long life, good elasticity and adhesion, fast clean sand consumption is low, not broken, clean up the workpiece brightness, good technical effect and so on.
It is also of high quality steel shot have advantages, inferior steel shot treatment effect is compromised, so how to test whether the steel grit qualified?
First, hardness. Steel shot too soft, can make clear at a slower pace, reduce work efficiency. Sandblasting reinforcement, too soft steel shot does not produce a suitable residual stress, low hardness sand forces could not have to compensate by increasing the impact time. Too high hardness will produce unsatisfactory surface topography, increase the breakage rate of elastic sand, make the consumption is too high, and wear the equipment is larger, increase the equipment maintenance cost, so the appropriate hardness is also the key.
2. Microstructure. Steel shot must can resist deformation microstructure structure, role in working face, reduce the energy loss increase or decrease the fatigue life. Tempered martensite is the resistance to fatigue, in addition, the microstructure must reduce fragile carbide in the microstructure, otherwise it will cause steel grit premature rupture, increase the usage.
3. Chemical composition. Decide the effect of heat treatment microstructure of steel shot and behind. Carbon content should be moderate, silicon, manganese, can improve the strength and hardness of steel shot, so try to higher. Sulfur, phosphorus is a harmful element, easy to make the steel shot produces brittleness, lead to premature rupture, should be low.
4. Fatigue life. Fatigue life is the ability of steel shot sand to resist crushing when acting on the working surface. The abrasive with the longest fatigue life will become the most economical abrasive if it can transfer the appropriate energy into the cleaning.
V. Physical defects. Steel shot must contain less as far as possible will cause abrasive broken physical defects. Because of the use of the production process of steel shot there are always some such physical defects. The production process must be controlled to reduce the proportion of defective particles.
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