High Chrome Cast Iron Grinding Balls
These are cast iron grinding balls with high chromium content, typically 10-18%, used in ball mills for grinding ores and minerals. They fall under HTS 7325.91.00.00 as cast articles of iron or steel specifically designed as grinding balls for mills. Their hardness and wear resistance make them ideal for mineral processing applications.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If forged rather than cast
Forged steel grinding balls are classified under other articles of iron or steel, not cast, shifting from 7325 to 7326.
If imported as complete mill parts set
When supplied as integral components of a grinding mill, they may classify under parts of machinery rather than standalone cast articles.
If for non-grinding mill applications like shot blasting
Similar cast balls used for surface preparation or peening fall under other cast articles, not specifically for mills.
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Import Tips & Compliance
• Verify chemical composition certificates to confirm cast iron/steel content and avoid misclassification under Chapter 72 unwrought metals
• Include mill test reports showing hardness (e.g
• HRC 58-65) and size specs to prove grinding ball function during customs review
Related Products under HTS 7325.91.00.00
White Cast Iron Grinding Pebbles for Mills
Elongated cast iron pebbles resembling balls, used interchangeably in rod mills for fine grinding. HTS 7325.91.00.00 includes 'similar articles' covering these non-spherical mill media. High hardness from white iron microstructure.
Heat-Treated Cast Steel Mill Balls 75mm
Uniform 75mm diameter cast steel balls, double heat-treated for maximum abrasion resistance in secondary grinding circuits. Specifically classified under HTS 7325.91.00.00 as cast grinding balls for mills. Standard size for batch ball mills.
Martensitic Cast Grinding Media for Coal Mills
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Low Chrome Cast Steel Grinding Balls
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Forged Alloy Steel Mill Grinding Balls
Although primarily cast, certain alloy steel balls are forged then heat-treated for superior toughness in overflow ball mills. However, if truly cast, they align with HTS 7325.91.00.00 as grinding articles for mills. Used extensively in cement and power plant pulverizers.
Cast Iron Sag Mill Grinding Media Balls
Heavy-duty cast iron balls for SAG and AG mills, featuring domed surfaces for optimal cascading action. HTS 7325.91.00.00 covers these as similar articles for mills due to cast iron composition and grinding function. Essential for primary grinding stages in copper/gold mining.