Durable **pulverizing media balls** are engineered for high-impact and high-wear environments, such as mining, cement, and power-generation mills. Below are the key categories and properties that define long-lasting performance:
1. **Forged Steel Balls – Impact Toughness**
- **Material**: Round steel bars (45#, 50Mn, 60Mn, 65Mn, B2, B3, BL, BG grades)
- **Hardness**: HRC 55–65 (surface & volumetric)
- **Breakage Rate**: <1%
- **Impact Value**: >12 J/cm²
- **Durability Features**:
- Heat-treated (quenched & tempered) for high hardness and toughness.
- Uniform microstructure after forging minimizes spalling and deformation.
2. **High Chrome Cast Balls – Wear Resistance**
- **Material**: High-chromium alloy steel (Cr: 12–28%)
- **Hardness**: HRC 60–65 (surface)
- **Wear Rate**: <50g/ton ore (lower than forged balls)
- **Applications**: Ideal for dry/wet grinding of ores (gold, copper, iron), cement clinker, and coal slurry.
- **Key Benefit**: Chrome carbides embedded in a martensitic matrix resist abrasion and corrosion.
3. **Hyper Steel Balls – Heavy-Duty Milling**
- **Material**: High-carbon alloy steel with Mo/Cr additives
- **Hardness**: 60–65 HRC (dia. 25–90mm); 55–63 HRC (dia. 110–150mm)
- **Durability**:
- Air/oil quenching ensures deep hardening.
- Retains toughness under repeated impacts in SAG/ball mills.
**Pro Tip**
For **cobalt ores or highly abrasive minerals**, prioritize **27% chromium cobalt grinding balls** (as discussed earlier) or **high chrome cast balls** (Cr >20%) to minimize media consumption and downtime.