1. Chemical properties
Chemical composition
The chemical composition of steel shot mainly includes elements such as carbon (C), silicon (Si), manganese (Mn), sulfur (S), phosphorus (P), and may add alloy elements such as chromium (Cr), molybdenum (Mo), and nickel (Ni). For example:
Low carbon steel shot: C content is 0.08%-0.30%, Si content is 0.10%-0.25%, Mn content is 0.35%-1.50%, S and P content are both ≤0.030%.
High carbon steel shot: C content is 0.8%-1.2%, Si content is 0.4%-1.2%, Mn content is 0.6%-1.2%, S and P content are both ≤0.05%.
Alloy steel shot: Alloy elements such as Cr, Mo, Ni, etc. are added to ordinary steel shot to improve its performance.
Corrosion resistance
The corrosion resistance of steel shot is closely related to its chemical composition. For example, stainless steel shot (such as 316 stainless steel shot) has a high nickel and molybdenum content, showing excellent corrosion resistance, suitable for surface treatment in the fields of chemicals, inks, rubber, etc.
2. Physical properties
Hardness
The hardness of steel shot is a key factor affecting its surface treatment effect. The hardness range of different types of steel shot is as follows:
Low carbon steel shot: hardness is HRC40-56.
High carbon steel shot: microhardness is 390HV-530HV, hardness range is 45-65HRC.
Alloy steel shot: moderate hardness, good impact resistance and service life.
Metallographic structure
The metallographic structure of steel shot determines its mechanical properties and service life. For example:
Low carbon steel shot: the metallographic structure is a combination of martensite and bainite in a duplex structure.
High carbon steel shot: the metallographic structure is tempered martensite or tempered troostite.
Alloy steel shot: the metallographic structure is uniform, without pores and looseness, and the uniformity of the structure is good.
Density
The density of steel shot is usually high, for example, the density of high carbon steel shot is ≥7.0g/cm³, and the density of alloy steel shot can reach 7.58g/cm³. High density helps to improve the impact force and cleaning efficiency of steel shot.
Particle size uniformity
The particle size uniformity of steel shot directly affects the effect of surface treatment. High-quality steel shot has uniform particle size, which can clean the surface of workpiece evenly and quickly, shorten the processing time and improve work efficiency.
Rebound
Steel shot has good rebound, which can rebound quickly when cleaning the workpiece, reduce energy loss and improve cleaning efficiency. At the same time, steel shot with good rebound can reduce wear on equipment and extend the service life of equipment.
Wear resistance
Steel shot is a high-quality wear-resistant material with a long service life. For example, the life of alloy steel shot can reach 3000-3500 cycles, and the wear resistance is 3-5 times that of cast steel shot.
Steel shot is widely used for descaling and rust removal treatment
How are steel shot and grit used to treat steel surfaces?
Steel shot is widely used for descaling and rust removal treatment
What are the unique characteristics of steel shot?
