Grinding Balls

Molycop’s grinding balls are designed for optimal wear performance and impact resistance for a range of milling environments.

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Product Features

Size: Molycop manufactures forged grinding balls for use in ball milling and regrind applications in nominal sizes from 25mm to 105mm or 1.0 to 4.0 inches in diameter.
Chemistry: An individual chemical profile has been developed for each diameter ball to correspond with the requirements for heat treatment. Specific alloy additions are included to produce optimum physical properties. The chemistry of the balls is controlled through a close collaboration with our bar suppliers and robust internal quality systems.
Hardness: Surface and cross-sectional hardness of the balls depends on the microstructure of the steel, which is achieved using carefully selected heat treatment variables specifically designed for each alloy.

Product Overview

Molycop manufactures grinding balls to exacting internal specifications at grinding media production facilities across the globe. Grinding balls are designed for maximum abrasion resistance using high carbon content and high hardness levels.

Grinding balls use high-carbon alloy steel bars as the raw material and are then subject to special bar heating, forging and heat treatment processes to obtain optimum wear and impact resistance.

Product Typical Uses

Molycop’s mid-size ball range is primarily used for secondary ore grinding operations. The regrind ball series is primarily used for regrind or tertiary grinding operations. Both are ideal for ball mill operations in which high wear resistance is the main ball attribute required.

Product Benefits

Molycop’s forged grinding balls for use in ball milling and regrind applications deliver:

optimum wear resistance
optimum impact resistance.

Technical Data

Ball Diameter		C		Mn		Si		Cr		Mo
in.	mm.	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.
2.0	50	0.90	1.10	0.75	1.25	0.10	0.50	0.10	0.60	0.00	0.10
2.5	65	0.90	1.10	0.75	1.25	0.10	0.50	0.25	0.75	0.00	0.10
3.0	80	0.90	1.10	0.75	1.25	0.10	0.50	0.30	0.80	0.00	0.10
3.5	94	0.85	1.05	0.75	1.25	0.10	0.50	0.40	0.90	0.00	0.10
4.0	105	0.85	1.05	0.75	1.25	0.10	0.50	0.50	1.00	0.00	0.10
S Max (0.040)						P Max (0.035)

Ball Diameter		Average Surface Hardness		Average Volumetric Hardness
in.	mm.	Min.	Max.	Min.	Max.
2.0	50	59	65	59	65
2.5	65	59	65	59	65
3.0	80	59	65	59	65
3.5	94	59	65	59	65
4.0	105	59	65	59	65
The above is intended as a guide only. Individual ball hardness readings may fall outside the range listed above.

Ball Diameter (in)

Minimum Mass (g)

Maximum Mass (g)

Ball Diameter (mm)

Minimum Mass (g)

Maximum Mass (g)

2.0

535

642

511

613

2.5

1046

1255

1122

1346

3.0

1807

2168

2091

2509

3.5

2869

3443

3392

4070

4.0

4283

5140

105

4728

5674

Ball Diameter (in)

Minimum Mass (g)

Maximum Mass (g)

Ball Diameter (mm)

Minimum Mass (g)

Maximum Mass (g)

1.0

1.25

131

164

134

168

1.5

226

283

261

326

Ball Diameter		Average Surface Hardness		Average Volumetric Hardness
in.	mm.	Min.	Max.	Min.	Max.
1.0	25	59	65	59	65
1.25	32	59	65	59	65
1.5	40	59	65	59	65
The above is intended as a guide only. Individual ball hardness readings may fall outside the range listed above.

Ball Diameter		C		Mn		Si		Cr		Mo
in.	mm.	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.
1.0	25	0.90	1.10	0.50	1.00	0.10	0.50	0.00	0.50	0.00	0.10
1.25	32	0.90	1.10	0.50	1.00	0.10	0.50	0.00	0.50	0.00	0.10
1.5	40	0.90	1.10	0.50	1.00	0.10	0.50	0.00	0.50	0.00	0.10
S Max (0.040)						P Max (0.035)