Mill Grinding Balls, Grinding Cylpebs and Grinding Rods
PRODUCT PARAMETERS
Description
High Chromium Casting Steel Cylpebs
Diameter tolerance and Length tolerance
| Diameter（mm) | 8×10 | 10×12 | 12×14 | 14×16 | 16×18 | 18×20 | 20×25 |
| 25×30 | 30×35 | 35×40 | 40×45 | 45×50 | 50×55 | 55×60 | |
| Diameter tolerance(mm) | +1，-1 | ||||||
| Length tolerance（mm） | +2，-2 | ||||||
Technical specification
| Material Gr. | Diameter(mm) | Hardness(HRC) | Breakage rate | Impact value(J/cm²) | Drop times(times) | Micro structure |
| ZQCr26 | 17-150 | >58 | <1% | >7 | ≥12000 | M+C |
| ZQCr20 | 17-150 | >58 | <1% | >6 | ≥12000 | M+C |
| ZQCr15 | 17-150 | >58 | <1% | >5 | ≥12000 | M+C |
| ZQCr12 | 17-150 | >58 | <1% | >3.5 | ≥12000 | M+C |
| ZQCr8 | 17-150 | >58 | <1% | >3 | ≥12000 | M+C |
Chemical composition
| Brand | Chemical composition（%） | ||||||||
| C | Si | Mn | Cr | Mo | Cu | Ni | P | S | |
| ZQCr26 | 2.0-3.3 | 1.2max | 0.3-1.5 | >23.0-30.0 | 0-3.0 | 0-1.2 | 0-1.5 | ≤0.10 | ≤0.06 |
| ZQCr20 | 2.0-3.3 | 1.2max | 0.3-1.5 | >18.0-23.0 | 0-3.0 | 0-1.2 | 0-1.5 | ≤0.10 | ≤0.06 |
| ZQCr15 | 2.0-3.3 | 1.2max | 0.3-1.5 | >14.0-18.0 | 0-3.0 | 0-1.2 | 0-1.5 | ≤0.10 | ≤0.06 |
| ZQCr12 | 2.0-3.3 | 1.2max | 0.3-1.5 | >10.0-14.0 | 0-3.0 | 0-1.2 | 0-1.5 | ≤0.10 | ≤0.06 |
| ZQCr8 | 2.1-3.3 | 2.2max | 0.3-1.5 | 7.0-10.0 | 0-1.0 | 0-0.8 | － | ≤0.10 | ≤0.06 |
1. Definition and Composition
- High Chrome Alloy: Typically includes 10%-30% chromium, enhancing hardness and corrosion resistance. Extra elements like carbon (1.5-3.5%), molybdenum, and nickel are included to improve wear resistance, strength, and toughness.
- Casting Steel: Manufactured by casting molten alloy into molds. Then it undergoes heat treatment, which involves quenching and tempering, to achieve the desired microstructure.
- Cylpebs: Cylindrical grinding media (25-100mm in length/diameter) with a slightly conical shape, offering increased surface area compared to spherical balls.
2. Key Properties
- Hardness: 58-68 HRC due to martensitic matrix and chromium carbides.
- Wear Resistance: Superior due to hard carbides (e.g., Cr7C3) embedded in the microstructure.
- Impact Toughness: Balanced through heat treatment to prevent brittleness.
3. Manufacturing Process
- Casting: Molten alloy poured into molds to form cylpebs.
- Heat Treatment: Quenching (oil/air) forms martensite; tempering reduces brittleness.
- Finishing: Surface grinding/polishing for dimensional accuracy.
4. Applications
- Industries: Mining (ore grinding), cement (clinker processing), coal pulverization, ceramics.
- Advantages: Extended lifespan (2-3x longer than low-chrome media), reduced downtime, higher grinding efficiency.
5. Performance Considerations
- Shape Efficiency: Cylindrical shape enhances grinding contact and material flow in mills.
- Size Distribution: Tailored to mill specifications for optimal performance.
6. Standards and Quality Control
- Standards: ASTM A532 (wear-resistant cast irons), ISO 9001 for quality management.
- Testing: Hardness (Rockwell), impact (Charpy), microstructure analysis, spectroscopic composition checks.
7. Environmental and Safety Aspects
- Sustainability: Longer lifespan reduces waste generation.
- Recycling: Spent cylpebs can be remelted to recover chromium.
- Safety: Handling requires precautions to avoid hexavalent chromium exposure during production.
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FAQs
What is the difference between forged grinding balls and cast grinding balls?
Forged grinding balls are made by heating and shaping high-carbon or alloy steel under high pressure, resulting in superior hardness, impact resistance, and longevity. Cast grinding balls are produced by melting and pouring metal into molds, offering a cost-effective solution for less demanding grinding environments. Forged balls excel in high-impact mining operations, while cast balls are ideal for lower-impact scenarios like cement or coal grinding.
How do I choose between forged and cast grinding balls?
Choose forged balls for high-impact, large-scale mining (e.g., copper, gold) where durability and low wear rates are critical.
Choose cast balls for cost-sensitive applications with softer materials (e.g., limestone, coal) or smaller operations.
Can it be customized as per our requirements?
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Can you customize the size and hardness of grinding media?
Yes! We offer fully customizable solutions. Specify your required diameter (e.g., 20–150mm for balls), hardness (HRC 50–65), and material composition to match your mill’s operating conditions (e.g., ore hardness, rotation speed).
What materials are used in your grinding rods and mine liners?
- Grinding Rods: Made from high-carbon steel or alloy steel, heat-treated for optimal wear resistance and toughness.
- Mine Liners: Constructed from high-manganese steel, chromium steel, or composite alloys to withstand abrasion and impact in mills.
What countries do you export to?
We ship globally, with major clients in South America, Africa, Australia, North America, and Southeast Asia.
How long is the production and delivery time?
Standard Products: 15–25 days after order confirmation.
Customized Orders: 25–35 days, depending on specifications.
Shipping: Delivery times vary by destination
What packaging do you use to ensure product safety?
Grinding balls/rods: Packed in steel drums or bulk bags with anti-rust treatment.
Mine liners: Wooden crates or pallets with waterproof wrapping.
How do you ensure product quality?
We enforce strict quality control:
100% surface defect checks before shipment.
Raw material inspection (spectral analysis).
Hardness and impact testing (Rockwell, Charpy tests).
How do you ensure product quality?
We enforce strict quality control:
100% surface defect checks before shipment.
Raw material inspection (spectral analysis).
Hardness and impact testing (Rockwell, Charpy tests).
