Grinding balls and similar articles for mills
Other cast articles of iron or steel: > Other: > Grinding balls and similar articles for mills
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified 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
Martensitic white iron cast balls for pulverizing coal in thermal power plants. HTS 7325.91.00.00 applies due to cast construction and mill grinding purpose. Engineered for low contamination in fuel processing.
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.
Low Chrome Cast Steel Grinding Balls
Cast steel balls with 1-10% chromium content, engineered for semi-autogenous grinding (SAG) mills in mining operations. Classified under HTS 7325.91.00.00 due to their cast construction and specific use as mill grinding media. They provide balanced impact and abrasion resistance for large-scale ore processing.
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.
Chrome-Moly Cast Grinding Balls for Cement Mills
Chromium-molybdenum alloy cast balls optimized for cement clinker grinding in tube mills. Their cast structure and mill-specific design place them under HTS 7325.91.00.00. Provide extended wear life in high-abrasion environments.