HS code · 6-digit subheading
HS Code 7325.91 – Iron; grinding balls and similar articles for mills, other than of non-malleable cast iron
HS code 7325.91 is the 6-digit subheading for iron, grinding balls and similar articles for mills, other than of non-malleable cast iron. It is used for high-chrome grinding balls, forged grinding balls, cast grinding balls (malleable), grinding rods and mill liners (some types).
What HS 7325.91 covers
This HS code is dedicated to grinding balls and similar articles for mills, specifically those made of iron and steel, but excluding non-malleable cast iron. These specialized products are critical consumables in industries like mining, cement production, and power generation, where they are used as grinding media in ball mills to pulverize raw materials. International trade is characterized by a global demand driven by resource extraction and construction booms. Importers are typically countries with significant mining operations or large-scale cement production, such as Chile, Peru, and Australia. Exporters are nations with advanced metallurgical industries capable of producing high-hardness, wear-resistant grinding media, with China, Australia, and South Africa being prominent. The trade focuses on material composition, hardness, and wear life, which directly impact operational efficiency.
- Covers
- High-chrome grinding balls
- Forged grinding balls
- Cast grinding balls (malleable)
- Grinding rods
- Mill liners (some types)
- Steel grinding cylinders
- Grinding media for ball mills
- Examples
- Magotteaux (grinding media)
- Moly-Cop (grinding balls)
- Scaw Metals (grinding media)
- Estanda (mill components)
- Metso Outotec (grinding solutions)
Codes often confused with 7325.91
Common mistake. Can be confused with 732611 (forged/stamped grinding balls) if the casting vs. forging distinction is blurred, or 8474 (machinery for grinding) if the entire mill is considered.
Top exporters and importers of HS code 732591, 2025
In 2025, the largest exporter of HS code 732591 in UN Comtrade data was China, with 40% of world exports; the largest importer in UN Comtrade data was Australia, with 16% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Top exporters 2025 · share of world exports
- 1 China $287M 40% of world exports
- 2 India $183M 26% of world exports
- 3 Thailand $149M 21% of world exports
World total: $709M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Australia $121M 16% of world imports
- 2 Brazil $74M 9.6% of world imports
- 3 Ghana $45M 5.8% of world imports
World total: $769M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for 7325.91
Brazil does not split HS 7325.91: its NCM code is 7325.91.00.
All Brazil NCM codes in heading 73.25 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 7325.91
What is HS code 732591?
HS code 732591 is a 6-digit subheading in the Harmonized System that covers: Iron; grinding balls and similar articles for mills, other than of non-malleable cast iron. This HS code is dedicated to grinding balls and similar articles for mills, specifically those made of iron and steel, but excluding non-malleable cast iron. These specialized products are critical consumables in industries like mining, cement production, and power generation, where they are used as grinding media in ball mills to pulverize raw materials. International trade is characterized by a global demand driven by resource extraction and construction booms. Importers are typically countries with significant mining operations or large-scale cement production, such as Chile, Peru, and Australia. Exporters are nations with advanced metallurgical industries capable of producing high-hardness, wear-resistant grinding media, with China, Australia, and South Africa being prominent. The trade focuses on material composition, hardness, and wear life, which directly impact operational efficiency.
What products fall under HS code 732591?
High-chrome grinding balls, forged grinding balls, cast grinding balls (malleable), grinding rods, mill liners (some types), steel grinding cylinders, grinding media for ball mills
What are common misclassifications for HS code 732591?
Can be confused with 732611 (forged/stamped grinding balls) if the casting vs. forging distinction is blurred, or 8474 (machinery for grinding) if the entire mill is considered.
Which countries are the top exporters of goods under HS code 732591?
In 2025, the top exporters of HS code 732591 in UN Comtrade data were China ($287M, 40% of world exports), India ($183M) and Thailand ($149M). World exports came to about $709M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of goods under HS code 732591?
In 2025, the top importers of HS code 732591 in UN Comtrade data were Australia ($121M, 16% of world imports), Brazil ($74M) and Ghana ($45M). World imports came to about $769M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
How is HS code 732591 structured?
HS code 732591 is a 6-digit subheading under the Harmonized System. The first 2 digits (73) identify the chapter, digits 3-4 (25) identify the heading, and digits 5-6 (91) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 732591?
In Brazil, HS code 732591 is NCM 7325.91.00. The last two digits are 00 because Brazil does not split this HS code further.