Grinding Balls / FORGED-BALL
Forged Mill Ball
High-impact forged steel ball used in mining, cement, and power plants. Different alloy grades ensure superior wear resistance and extended grinding performance.
Technical Specifications
Key Features
- High impact toughness
- Superior wear resistance
- Homogeneous structure and density
- Crack and breakage resistance
- Heat-treated surface hardness
- Available in standard and custom diameters
Applications
- Mining and ore grinding mills
- Cement production plants
- Coal and clinker grinding systems
- Limestone and mineral preparation lines
- Power generation units
- Metallurgy and construction industries
Dimension Table
| Diameter | Weight | Hardness | Tolerance |
|---|---|---|---|
| 30 mm | 0.111 kg | Surface > 58 HRC, Core > 57 HRC | ±2 mm |
| 40 mm | 0.264 kg | Surface > 58 HRC, Core > 57 HRC | ±2 mm |
| 50 mm | 0.515 kg | Surface > 58 HRC, Core > 55 HRC | ±3 mm |
| 60 mm | 0.890 kg | Surface > 58 HRC, Core > 55 HRC | ±3 mm |
| 70 mm | 1.413 kg | Surface > 58 HRC, Core > 55 HRC | ±3 mm |
| 80 mm | 2.110 kg | Surface > 58 HRC, Core > 55 HRC | ±3 mm |
| 90 mm | 3.004 kg | Surface > 58 HRC, Core > 55 HRC | ±4 mm |
Technical Notes
- 01Produced by hot forging and heat treatment (quenching & tempering).
- 02Surface hardness: 55–65 HRC, Core hardness: 45–55 HRC.
- 03Each ball is tested for hardness and dimensional accuracy.
- 04Delivered with EN 10204 3.1 certification upon request.
Available Types
Material Grades
What are forged grinding balls?
Forged grinding balls are the grinding media used in ball mills and SAG mills to grind ore and clinker in mining and cement plants. They are forged from medium/high-carbon alloy steel and quenched and tempered to a surface hardness of 55–65 HRC; supplied in diameters from 20 to 150 mm.
Forged vs cast grinding balls and how to choose
Because hot forging compacts the internal structure, forged balls contain no casting porosity or shrinkage cavities — giving high impact toughness and a low breakage rate. In large-diameter SAG mills with severe impact loads this difference is critical. High-chromium cast balls, on the other hand, can excel in dry grinding (especially cement) thanks to wear resistance. Ball diameter is selected from mill type, feed size and target fineness: coarse primary grinding uses large diameters (80–150 mm), fine grinding small ones (20–60 mm). Heat treatment aims at an even hardness profile from surface to core, so the ball keeps its hardness as it wears. Consumption is tracked in grams-to-kilograms per tonne ground, depending on ore abrasiveness, and balanced with regular top-up charges.
Frequently Asked Questions
Forged or cast grinding balls — which is better?+
For high-impact wet grinding and SAG mills, forged balls win (porosity-free structure, high toughness, low breakage); for dry grinding and cement, high-chromium cast balls compete well on wear resistance.
How is grinding ball diameter selected?+
From feed size and target fineness: 80–150 mm for coarse feed and primary grinding, 20–60 mm for secondary/fine grinding. Most plants blend several diameters for a balanced charge.
What hardness should grinding balls have?+
Typical surface hardness of forged balls is 55–65 HRC. An even surface-to-core hardness profile matters: a ball that is only surface-hard softens quickly as it wears and consumption rises.
How is ball consumption measured?+
As worn ball mass per tonne ground (g/t); it varies with ore abrasiveness and mill conditions. Regular top-up charges keep the mill filling ratio constant.
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