Stainless steel grinding pellets are a type of metallic abrasive produced through specific processes, primarily used for shot blasting and polishing of metal surfaces. They are 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 pellets mainly includes wire drawing, cutting, and rounding steps:
1. Wire Drawing: Cold-drawn stainless steel wires (such as SUS304, SUS430, etc.) are used to ensure high purity and uniformity of the raw material.
2. Cutting: The stainless steel wires are 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 products of different particle size specifications are obtained through screening.
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 range in the new material state is 400-600 HV (SUS304) or 300-450 HV (SUS430).
Bulk Density: Approximately 7.9 g/cm3 for round pellets, slightly lower for cut pellets.
Shape: Spherical (round pellets) or cylindrical (cut pellets), with high roundness and dense structure.
III. Application Areas
Stainless steel grinding pellets are 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 blasting efficiency, and minimal wear on equipment.
2. Environmental Friendliness and Safety:
- No iron dust, avoiding secondary pollution and meeting green production requirements.
- Treated workpiece surfaces are free of residual rust and can directly proceed to subsequent processing steps.
3. Wide Adaptability:
- Large particle size range (0.2-2.5 mm), suitable for workpieces of different hardnesses (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 pellets offer 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, the long lifespan and low consumption result in lower overall costs.