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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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 Animation Milling Balls Grinding Milling Balls Grinding

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.

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. 

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 50 511 613
2.5 1046 1255 65 1122 1346
3.0 1807 2168 80 2091 2509
3.5 2869 3443 94 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 67 84 25 64 80
1.25 131 164 32 134 168
1.5 226 283 40 261 326
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)

Downloads

Milling / Metallurgist / Process engineer / Purchasing procurement officer / Download / Tech Sheets & Brochures Mid-size Balls
Milling / Metallurgist / Process engineer / Purchasing procurement officer / Download / Tech Sheets & Brochures Regrind Balls

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