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Ball Mill Balls

Our ball mill balls provide consistent hardness, roundness and wear performance across a broad range of industrial grinding requirements.

Key Specifications

Chromium Options: Low / Medium / High / Special High Chrome
Hardness Range: HRC 45–66 depending on grade
Diameter Range: φ15–160 mm
Density: 7.6–7.9 g/cm³

Applications

Ball Mills
Mineral Processing
Cement Grinding
Hard Rock Grinding
Wet & Dry Grinding

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Product Description

Chemical Composition

Name	（%）
Name		C	Si	Mn	Cr	P	S	Al	Mo	Cu	Ni
Low chromium cast ball	2.0–3.5	≤1.2	0.3–1.0	0.3–1.0	≤0.15	≤0.25
Ball chromium cast in	2.0–3.3	≤1.2	0.3–1.0	3.0–8.0	≤0.15	≤0.15
High chromium cast ball	1.8–3.3	≤1.2	0.3–1.0	10–11	≤0.1	≤0.1
Special high chromium cast ball	According to the customer actual situation,the other way on contract agreement.

Mechanical Properties And Microstructure

Name	Hardness (HRC)	Metallographic Organization
Low chromium micro section	45~53	P+C
Chrome micro period in	47~55	P+C
High chrome micro section	58~66	M+C
C – carbide	P – pearlite	M – martensite

Core Physical Properties

Monolithic, Homogeneous Cast Structure

Produced via precision medium-frequency furnace melting, ensuring uniform dispersion of alloying elements and eliminating issues like surface-hard/core-soft layering. Wear resistance remains stable even as the ball shrinks in size, preventing rapid consumption in the later stages of use.

High Impact Toughness and Fatigue/Spalling Resistance

A specialized tempering process relieves casting stresses, preventing large-scale surface spalling or flaking under repeated high-speed impacts. Unlike forged steel balls, there is no risk of forging cracks, resulting in minimal breakage during long-term continuous operation.

High Density and Grinding Kinetic Energy

Metal density reaches 7.6–7.9 g/cm³. Compared to lightweight grinding media, these balls deliver greater impact force, significantly improving crushing efficiency for hard rock and high-hardness clinker while shortening grinding times.

Resistance to Slurry Erosion and Corrosion

High chromium content forms a stable, rust-resistant passivation layer. In wet mineral processing or cement wet-grinding environments, the balls withstand slurry erosion and acid/alkali corrosion, preventing rust-induced iron contamination of the finished product.

Unique Manufacturing Advantages

High-Pressure Metal Mold Casting for Superior Sphericity

Cast in enclosed metal molds, the balls feature precise curvature and excellent roundness. This ensures uniform wear without lopsidedness, stabilizes the movement trajectory of media inside the mill, and eliminates grinding "dead zones."

Flexible Customization Across All Specifications

Diameters range from φ15mm to 160mm, with adjustable chromium content (high, medium, or low). Specialized ball compositions are tailored for coarse, medium, and fine grinding stages to precisely match the customer's specific mill operating conditions.

Solid, Defect-Free Internal Quality

Directional solidification eliminates internal gas porosity and shrinkage cavities. The resulting solid, dense structure prevents the formation of hollow balls, thereby avoiding breakage and discharge grate clogging caused by hollow ball failure upon impact.

Key Highlights of Operational Cost Reduction

Significant Reduction in Manual Maintenance Costs

Exceptional wear resistance extends the interval between ball replenishment by 2 to 4 times; this reduces the labor hours required for frequent ball charging and the removal of broken fragments, while also decreasing the frequency of downtime for maintenance.

Reduced Consumption of Equipment Consumables

Intact, spherical steel balls deliver gentle, point-contact impacts without sharp fragments scraping against mill liners, screen liners, or partition plates; this extends the service life of liners and drastically cuts spending on equipment spare parts.

Energy Conservation and Reduced Power Consumption

High sphericity ensures uniform rotational resistance and stable mill loading; motor power consumption drops by 5–12% for the same production output, resulting in substantial electricity cost savings over the long term.