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Help CenterExtra High Chrome Cast Iron Grinding Balls Cr 20%-30% HRC62-65 Extreme Wear Resistance For SAG Mills Heavy Mining
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Extra High Chrome Cast Iron Grinding Balls – Extreme Wear Resistance for SAG Mills & Heavy Mining
Product Description
Ningguo Huafeng Wear-Resistant Material Co., Ltd. supplies extra high chrome cast iron grinding balls with chromium content of 20%-30% and hardness up to 62-65 HRC. Through advanced dual-medium quenching (oil/air selectable) and tempering heat treatment, these balls achieve a Martensite + high volume fraction M7C3 Carbide (40%-50%) microstructure. Specifically designed for SAG mills, large ball mills, and extreme high-wear mining applications. Wear life is 2.5-3 times that of standard high chrome balls – significantly reducing grinding cost per ton of ore.
Advanced Casting Ball Production Line
Internationally advanced dual-medium heat treatment line
Visual inspection personnel Casting ball sorting machine
furnace temperature measuring instrument
Fully automatic Vickers hardness tester
OBLF spark optical emission spectrometer
Key Technical Parameters
- Diameter: φ60mm – φ150mm
- Cr Content: 20% – 30%
- Surface Hardness: 62 – 65 HRC
- Core Hardness: 58 – 62 HRC
- Impact Value: ≥3.0 J/cm²
- Breakage Rate: ≤0.5%
- Carbide Volume Fraction: 40%-50%
- Microstructure: Martensite + High Volume Fraction M7C3 Carbide
- Heat Treatment: Dual-Medium Quenching (Oil/Water/Air Selectable) + Tempering
Product Advantages
| Feature | Benefit |
|---|---|
| 62-65 HRC ultra-high hardness | Extreme wear resistance for hardest ores |
| Breakage ≤0.5% | Extremely low breakage minimizes mill downtime |
| 40%-50% carbide volume fraction | Superior abrasive wear resistance |
| 2.5-3x standard high chrome life | Dramatically reduces grinding cost per ton |
| Dual-medium quenching process | Flexible medium selection to optimize microstructure for specific applications |
Performance Comparison
| Comparison | Extra High Chrome (20%-30%) | Standard High Chrome (10%-18%) | Improvement |
|---|---|---|---|
| Surface Hardness (HRC) | 62-65 | 58-62 | +3-5 HRC |
| Breakage Rate (%) | ≤0.5 | ≤1 | 50% reduction |
| Relative Wear Life | 2.5-3x | 1x (baseline) | +150%-200% |
| Suitable Application | Extreme wear | General wear | — |
Ideal Applications
- Semi-autogenous mills (SAG mills)
- Large ball mills (diameter >5m)
- Extremely hard ores: Magnetite, Porphyry Copper, Quartz-bearing Gold Ores
- High wear ores with Bond Work Index >20 kWh/t
Quality Assurance
Every batch is tested for chemical composition with German OBLF spectrometer, hardness with hardness tester, breakage resistance with falling ball tester (>15,000 cycles), and carbide morphology with metallographic microscope. The company is ISO9001, ISO14001 and ISO45001 certified.
Contact us – provide your mill parameters, ore type, and current wear rate. Our technical team will calculate the cost savings achievable with extra high chrome balls and provide a trial order proposal.
Trial orders available – we support small batch trial orders for performance validation before full-scale purchasing.
Send Inquiry to This Supplier
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