Stainless steel grinding shot is a type of metallic abrasive produced through specific processes, primarily used for surface blasting and polishing of metals. It is characterized by high efficiency, environmental friendliness, and durability. The following provides a detailed introduction from aspects such as production process, material properties, application areas, and performance advantages:
I. Production Process
The manufacturing process of stainless steel grinding shot mainly includes wire drawing, cutting, and rounding:
1. Wire Drawing: Cold-drawn stainless steel wire (such as SUS304, SUS430, etc.) is used to ensure high purity and uniformity of the raw material.
2. Cutting: The stainless steel wire is cut into cylindrical or spherical particles.
3. Rounding: Through a passivation grinding process, the edges generated during cutting are removed to form spherical or smooth cylindrical particles. The final product is obtained through screening to achieve different particle size specifications.
II. Material Properties
1. Chemical Composition:
SUS304: Carbon ≈0.08%, Chromium ≈18%, Nickel ≈8%, Silicon ≈1%, Manganese ≈0.8%.
SUS430: Carbon ≈0.1%, Chromium ≈16%, Nickel ≈1%, Manganese ≈1.2%.
2. Physical Properties:
Hardness: Hardness ranges from 400-600 HV (SUS304) or 300-450 HV (SUS430) in the new material state.
Bulk Density: Approximately 7.9 g/cm3 for round shots, slightly lower for cut shots.
Shape: Spherical (round shots) or cylindrical (cut shots), with high sphericity and dense structure.
III. Application Areas
Stainless steel grinding shot is widely used in the following scenarios:
Surface Treatment:
Cleaning and Deburring: Suitable for removing surface scale and burrs from castings, forgings, profiles, and welded parts.
Strengthening and Finishing: Shot peening enhances the fatigue resistance of workpiece surfaces, forming a compressive stress layer and extending service life.
Matte Effect: After treatment of non-ferrous metals such as copper, aluminum, zinc, and stainless steel, the natural metal color is highlighted without rust spots, eliminating the need for acid washing.
IV. Performance Advantages
1. High Efficiency and Durability:
- Wear resistance is 3-5 times that of cast steel shot, with a long cycle life, reducing production costs.
- Low consumption, high shot peening efficiency, and minimal wear on equipment.
2. Environmental Friendliness and Safety:
- No iron dust, avoiding secondary pollution and meeting green production requirements.
- Treated workpieces have no residual rust and can proceed directly to subsequent processing steps.
3. Wide Adaptability:
- Large particle size range (0.2-2.5 mm), suitable for workpieces of varying hardness (such as quenched gears, springs, stainless steel parts, etc.).
V. Comparison with Other Abrasives
Compared to traditional cast steel shot or cut wire shot, stainless steel grinding shot offers the following unique advantages:
- No Pores or Cracks: Dense internal structure prevents dust pollution caused by breakage.
- Corrosion Resistance: Stainless steel material can be used long-term in humid or acidic environments, avoiding rust issues.
- Lower Overall Cost: Although the unit price is higher, its long lifespan and low consumption result in lower overall costs.