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Grinding Balls

Our high chrome grinding balls provide uniform hardness, low breakage and strong wear resistance for demanding industrial milling operations.

Key Specifications

Material: High-chromium cast alloy
Surface Hardness: HRC 60–68
Diameter Range: φ20–150 mm
Breakage Rate: <0.8%

Applications

Mining & Mineral Processing
Cement Clinker Grinding
SAG Grinding
Closed-Circuit Grinding
Fine & Ultra-Fine 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

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.

Core Material and Physical Properties

Ultra-high hardness with uniform hardness throughout

Manufactured using a high-chromium alloy casting process, the surface hardness reaches HRC 60–68 with a core-to-surface hardness variance of ≤2 HRC. Consistent hardness from surface to core ensures the wear rate does not accelerate over time—vastly outperforming low-chromium balls (HRC 40–50) and standard forged steel balls.

Dense microstructure and extremely low breakage rate

Utilizes a fully automated oil-quenching heat treatment process to produce a fine-grained structure with excellent impact toughness. The breakage rate is stably controlled below 0.8%; the balls resist cracking, spalling, and deformation under prolonged mill impact, maintaining consistent sphericity.

High density for powerful grinding impact

With a density of 7.5–7.8 g/cm³, the ball's own weight generates sufficient kinetic energy for crushing, delivering superior grinding efficiency for hard materials such as hard ores, cement clinker, and quartz sand.

Acid/alkali corrosion resistance; suitable for wet grinding

The high-chromium alloy forms a protective passivation film, resisting electrochemical corrosion in acidic or alkaline slurry environments. It resists rusting and spalling during long-term use in wet mineral processing, significantly reducing the risk of slurry contamination.

Manufacturing Process Advantages

Fully Automated Precision Casting

Produced via metal mold casting, offering a complete range of specifications (fully customizable from φ20–150mm). The balls feature perfect sphericity and tight dimensional tolerances, ensuring stable internal charge grading and preventing imbalances caused by size variations.

Standardized Heat Treatment Line

Features comprehensive temperature-controlled quenching and tempering processes. This eliminates internal casting stresses and balances hardness with toughness, avoiding common issues like brittleness and cracking. Suitable for various milling conditions, including semi-autogenous (SAG) grinding, closed-circuit grinding, and ultrafine grinding.

Recyclability

Spent steel balls can be remelted and recast, reducing industrial solid waste. This eco-friendly approach lowers secondary procurement costs, aligning with the energy-saving and cost-reduction goals of green mines and building material plants.

Operational Performance Advantages (Key Selling Points for Factory Cost Reduction)

Ultra-low wear rate, doubled service life

Wear rates as low as 0.08–0.2 g/cm³ per 1,000 hours; wear resistance lasts 2–5 times longer than low-chrome or standard forged steel balls, significantly reducing the frequency of ball replenishment and the volume of individual purchase orders.

Enhanced grinding efficiency, increased output and productivity

High hardness ensures superior crushing and grinding capabilities and uniform discharge fineness; hourly mill output increases by 10%–20%, while issues like over-grinding or under-grinding are minimized, ensuring consistent product quality.

Significant reduction in total operating costs

Extended ball replenishment cycles reduce the frequency of manual ball charging and downtime for cleaning;

Lower total steel ball consumption results in long-term procurement costs far below those of cheap, low-durability alternatives;

Reduced breakage minimizes wear on mill liners and shells, extending the service life of mill components.