Dibblee
Forged & Rolled Steel Grinding Balls
Forged & Rolled Steel Grinding Balls
Quoted on request. Price depends on the steel market and freight to your port. Tell us your port and specification and we will quote it delivered.
Contact Us For A QuoteForged & Rolled Steel Grinding Balls
Through-hardened carbon and low-alloy steel grinding balls for ball mills and rod mills, from 12 mm to 152 mm (1/2 in to 6 in). Supplied to ore, cement, lime, aggregate and coal-pulverising duties.
Two processes, one ladder
Rolled balls, 12–50 mm (1/2–2 in). Rolled direct from bar with in-line heat treatment, giving continuous grain flow and uniform hardness through the section — a genuine advantage over the uneven effect of hammer forging. Available in two carbon ranges: 0.7/0.9% C finishing at 600 BHN, and 0.6/1% C at a 350 BHN minimum.
Forged balls, 63 mm (2-1/2 in) and over. Where grinding is by impact rather than abrasion, forging from billet keeps the larger sizes economical without giving up toughness.
Sizes, weights and charge data
| Diameter | Weight each | Pieces per tonne | Surface area each |
|---|---|---|---|
| 12 mm | 7 g (0.016 lb) | 140,795 | 4.5 cm² |
| 15 mm | 14 g (0.031 lb) | 72,087 | 7.1 cm² |
| 17 mm | 20 g (0.045 lb) | 49,520 | 9.1 cm² |
| 20 mm | 33 g (0.073 lb) | 30,412 | 12.6 cm² |
| 25 mm (1 in) | 64 g (0.142 lb) | 15,571 | 19.6 cm² |
| 30 mm | 111 g (0.245 lb) | 9,011 | 28.3 cm² |
| 35 mm | 176 g (0.388 lb) | 5,674 | 38.5 cm² |
| 40 mm | 263 g (0.58 lb) | 3,801 | 50.3 cm² |
| 45 mm | 375 g (0.826 lb) | 2,670 | 63.6 cm² |
| 50 mm (2 in) | 514 g (1.13 lb) | 1,946 | 78.5 cm² |
| 63.5 mm (2-1/2 in) | 1.05 kg (2.32 lb) | 950 | 126.7 cm² |
| 76.2 mm (3 in) | 1.82 kg (4.01 lb) | 550 | 182.4 cm² |
| 88.9 mm (3-1/2 in) | 2.89 kg (6.37 lb) | 346 | 248.3 cm² |
| 101.6 mm (4 in) | 4.31 kg (9.5 lb) | 232 | 324.3 cm² |
| 114.3 mm (4-1/2 in) | 6.14 kg (13.53 lb) | 163 | 410.4 cm² |
| 127 mm (5 in) | 8.42 kg (18.56 lb) | 119 | 506.7 cm² |
| 139.7 mm (5-1/2 in) | 11.21 kg (24.71 lb) | 89 | 613.1 cm² |
| 152.4 mm (6 in) | 14.55 kg (32.07 lb) | 69 | 729.7 cm² |
Figures are calculated from nominal dimensions at the stated density and agree with the published mill tables to within rounding. They size a mill charge; they are not a certificate. Hardness is verified per ISO 6508 (Rockwell C) or ISO 6506 (Brinell) on request.
Selecting a size
- Larger balls grind by impact and suit coarse feed and harder ores.
- Smaller balls present far more surface per tonne of charge — a 12 mm ball gives roughly 160 times the pieces per tonne of a 152 mm ball — and grind by abrasion, which is what fine product needs.
- Most mills run a graded charge rather than a single size. Tell us the mill diameter, feed size and target product and we will recommend the ladder.
Also available
High chrome cast balls where wear life matters more than first cost, and cylpebs, slugoids or helipebs for fine grinding. See the grinding media guide for the full comparison.
Dibblee Industries Ltd.
Technical Data Sheet
Technical Specifications
| Parameter | Value |
|---|---|
| Material | Carbon and low-alloy steel |