Steel Shot

Steel Shot is a spherical particle made of special materials and subjected to special heat treatment. Product introduction First, high-quality steel blocks, wool, and steel scraps are melted, and then high-speed centrifugal molding is used to throw the molten steel into the water, causing the surface temperature of the steel shots to drop sharply to form pellets. This is a quenching. After primary quenching, the pellets are dried and reheated and tempered in the furnace to achieve the appropriate hardness. The tempered steel pellets are sorted through a mechanical screen into different grades of products that comply with SAE standards for shot peening. equipment. The excellent heat treatment control process gives the steel shot the best elasticity and fatigue resistance. Steel shot with different particle sizes and hardness are suitable for different processes. For example, it is widely used for shot peening of large-volume and heavy-duty components or materials. Steel shot is widely used for descaling and rust removal of steel workpieces before painting. In this case, centrifugal shot blasting equipment is often used. The spherical shape and small hardness prevent the steel shot from causing great wear and tear on the equipment. Steel shot is also widely used for sand cleaning of castings. When used with the proper equipment, steel shot is your best abrasive for surface cleaning because of its durability. Applicable industrial scope Aviation industry; Automotive industry; Sandblasting/painting dealers; Consumer goods manufacturing; Container manufacturing/repair; Casting; Granite/stone cutting; shipbuilding and ship repair; oil and gas pipelines; plant maintenance and metal fabrication. Applicable process range Surface pretreatment before painting, sand cleaning, pipeline descaling and strengthening It has moderate hardness, strong toughness, impact resistance, long service life, up to 2000-2900 times, good rebound, fast cleaning speed, low consumption, no breakage, fast cleaning speed, and good technical effect. The cleanliness of the metal surface treated by this product can reach GB/T8923-1989; the surface roughness can reach Rz=10--150μm, thus increasing the specific surface area of the metal surface and improving the surface adhesion of the paint after painting. It has very With significant economic benefits, it is currently the most advanced and ideal shot blasting cleaning and strengthening metal abrasive rust removal at home and abroad. Main technical requirements for high carbon steel shot Specification level: S400～S030; Microhardness: 390HV-530HV; Chemical composition: carbon: 0.8%-1.2%, manganese: 0.35%-1.2%, silicon: ≥0.4%, sulfur, phosphorus: ≤0.05%; Metallographic structure: tempered martensite or tempered troostite; Density ≥7.0g/cm3; The total amount of defects is ≤20%; Foreign impurities ≤1%; Moisture content ≤0.2%. The original standard GB6484-86 cast steel shot was abolished in 1993. Metallographic structure: tempered martensite, tempered troostite, reticular carbides > Grade 3 Hardness: 45---65HRC Density: 7.58g/cm3 Main categories Steel shots are mainly divided into the following situations according to their properties: (1) Non-national standard steel shot Non-national standard steel shot refers to the general term for steel shots whose various indicators do not meet the national standard level. This type of steel shot is easy to break, has relatively large dust, and has low cleaning efficiency. It is generally packaged in English neutral packaging and is a three-no product. The market price is lower than the national standard steel shot. (2) National standard steel shot National standard steel shot refers to steel shot that has been quenched once. The hardness of the steel shot is HRC40~50. Among them, carbon C: 0.85%-1.20%, silicon Si: 0.40%-1.20%, Mn: 0.60%-1.20% (S170: 0.50%-1.20% S110, S70: 0.35%-1.20%) sulfur S≤0.05%, Phosphorus P≤0.05. This type of steel shot has a wide range of applications and is widely used in cleaning, strengthening, counterweighting, etc. in various industries. (3) SQ steel shot SQ steel shot is actually a super-performance national standard steel shot, and its technical indicators are the same as the national standard steel shot. This type of steel shot undergoes secondary quenching to make the metallographic structure more dense, bridge micro-cracks on the surface, and refine the grains. Its service life is 1.3 times that of ordinary national standard steel shot. (4) Low shell steel shot Low bainite steel shot is the abbreviation of low carbon bainitic steel shot, the hardness of the steel shot is HRC42-48/48-54. Among them, carbon C: 0.10%-0.20%, silicon Si: 0.10%-0.30%, manganese Mn: 0.35%-1.5%, sulfur S≤0.05%, phosphorus P≤0.05%, and add Cr, Mo, Ni, B, Al, Cu and other alloying elements have twice the lifespan of ordinary national standard steel shots. Steel shot technical standards Main technical requirements for low carbon steel shot Specification level: S400～S030; Microhardness: 390HV-530HV; Chemical composition: carbon: 0.8%-1.2%, manganese: 0.35%-1.2%, silicon: ≥0.4%, sulfur, phosphorus: ≤0.05%; Metallographic structure: tempered martensite or tempered troostite; Density ≥7.0g/cm3; The total amount of defects is ≤20%; Foreign impurities ≤1%; Moisture content ≤0.2%. The original standard GB6484-86 cast steel shot was abolished in 1993. Since the surface color of tempered iron shot appears uniformly blue after annealing, tempered iron shot is often used as cast steel shot. The service life of the iron shot is only 50-400 times. The rust removal effect of the iron shot is seriously reduced and the interests of users are seriously damaged. other The chromium-molybdenum steel shot and manganese steel shot on the market are the concept propaganda words of the manufacturers, because if you add 1% of metal molybdenum, you need to add 10kg of metal molybdenum per ton of steel shot, which costs 4,000 yuan. At present, domestic iron Pills only sell for about 3,000 yuan/ton. Metallographic structure: tempered martensite, tempered troostite, reticular carbide>level 3 Hardness: 45---65HRC Density: 7.58g/cm3