SAG mills rely on the synergistic crushing action of large ore chunks and steel balls; the balls must withstand impacts from drops of several meters. Utilizing a low-alloy, high-toughness casting system, these balls offer impact resistance far superior to standard ball mill media. They do not suffer catastrophic shattering or radial cracking under violent, high-drop impacts, making them perfectly suited for the heavy-load impact conditions of SAG mills.

Conventional fine-grinding balls tend to flatten and lose their roundness under prolonged heavy pressure. These SAG-specific balls feature an optimized matrix microstructure with higher yield strength; they maintain a stable spherical profile under the continuous squeezing and impact forces of heavy-duty mills, preventing the loss of crushing efficiency caused by ball deformation.

The sharp edges of coarse ore inside the SAG mill constantly gouge the ball surface. The product’s wear-resistant surface matrix offers strong resistance to gouging, preventing rapid, large-scale grooving wear and maintaining a stable contact area for crushing.

In dry grinding environments characterized by dust and high temperatures, the balls resist oxidation and surface spalling. In wet grinding environments involving high-impurity, high-hardness slurries, they resist erosion-corrosion without surface rusting or flaking, avoiding contamination of the flotation process with excessive iron fines.

We offer a full gradient of large-diameter steel balls (φ80–160mm) with customized mix ratios—such as the large-plus-medium/small ball combinations shown in the image. Large balls crush coarse ore, while smaller balls fill the interstitial spaces to grind finer material; this optimizes the mill's internal filling rate and boosts overall throughput.

Large-diameter SAG balls are produced using a specialized slow-cooling process with thick-walled sand molds. This prevents common casting defects like core porosity and shrinkage cavities, ensuring a solid, dense structure that eliminates sudden ball breakage caused by internal voids.

To address the challenges of thick cross-sections in large balls, we employ segmented temperature-controlled quenching and tempering. This solves the industry-wide issue of insufficient core hardness, ensuring mechanical properties are balanced between the surface and the core, and achieving an optimal mix of wear resistance and toughness.

We customize ball diameter, chromium content, and mix ratios based on the client's SAG mill diameter, ore hardness, and throughput requirements. This eliminates the need for clients to source and mix different balls themselves, providing a one-stop solution for graded grinding media.