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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If heat-treated after forging
Post-forging processing moves to other articles of iron/steel,8688 for fabricated metal products.
If supplied with cast iron grates/skids
Grinding sets with additional cast components like discharge grates classify under cast reservoirs/tanks.
If ceramic-coated for wear protection
Ceramic composite grinding media shifts to Chapter 69 ceramic articles for mills.
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Import Tips & Compliance
• Request casting process documentation; forged items risk reclassification—ensure foundry certificates specify cast method
• Comply with country-of-origin rules; many originate from China/India—check AD/CVD orders for steel articles
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
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.
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.