Product classification
HS code for Hot rolling mill: 8455.21
Metal-rolling mills, hot or combination hot and cold rolling mills.
Classification of hot rolling mill under HS 8455.21
Hot rolling mills are classified under HS code 8455.21. This classification is part of Chapter 84, which covers nuclear reactors, boilers, machinery, and mechanical appliances. Heading 8455 specifically covers metal-rolling mills and rolls therefor. The subheading 8455.21 is designated for 'Hot or combination hot and cold' rolling mills. The classification is based on the machine's primary function: the reduction of the cross-sectional area of metal by passing it between rotating cylinders (rolls). Because the machinery is designed to handle metal at high temperatures (hot-rolling) or is a versatile unit capable of both hot and cold processes, it is distinguished from purely cold-rolling mills. This classification includes the housing, rolls, and the integrated mechanical components required for the rolling process, following GRI 1 and Note 3 to Section XVI regarding composite machines.
- Covers
- Hot strip mills for steel production
- Blooming and slabbing mills
- Plate rolling mills (hot)
- Combination hot and cold rolling mill stands
- Steckel mills for hot-rolling
- Also under 8455.21
- SMS Group hot strip mill
- Danieli plate mill
- Primetals Technologies hot rolling mill
- Fives reversing hot mill
Codes often confused with 8455.21
Common mistake. A common misclassification is 8455.22, which is reserved exclusively for cold-rolling mills. Another frequent error is attempting to classify individual rolls under 8455.21; however, rolls for mills are specifically classified under 8455.30. Furthermore, auxiliary machinery like cooling beds or coilers, if shipped separately, might be classified under 8479 or 8428, though they are often included here if part of a complete mill system.
Top exporters and importers of HS 845521 (the code used for hot rolling mill), 2025
In 2025, the largest exporter of HS 845521 (the code used for hot rolling mill) in UN Comtrade data was China, with 49% of world exports; the largest importer in UN Comtrade data was Mexico, with 22% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 845521, not only hot rolling mill.
Top exporters 2025 · share of world exports
- 1 China $269M 49% of world exports
- 2 Germany $105M 19% of world exports
- 3 Italy $98M 18% of world exports
World total: $553M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Mexico $193M 22% of world imports
- 2 India $142M 16% of world imports
- 3 Brazil $121M 14% of world imports
World total: $881M 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 codes for hot rolling mill
Brazil splits HS 8455.21 into 2 NCM codes. Pick the one that matches your product:
- 8455.21.10Hot or hot-and-cold rolling mills, plain rolls
- 8455.21.90Other hot or hot-and-cold rolling mills
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about hot rolling mill
What is the HS code for Hot rolling mill?
The HS code for Hot rolling mill is 845521 (Metal-rolling mills; hot or combination hot and cold rolling mills). The HS code for a hot rolling mill or a combination hot and cold rolling mill for metal is 8455.21.
How do I classify Hot rolling mill for customs?
Hot rolling mill is classified under HS code 845521 — Metal-rolling mills; hot or combination hot and cold rolling mills. This is a 6-digit subheading level code.
Does 8455.21 include the electrical control systems?
If the control systems are presented with the mill as a functional unit, they are generally classified together under 8455.21. If shipped separately, they may fall under Chapter 85 or 90.
Which countries are the top exporters of hot rolling mill (HS 845521)?
In 2025, the top exporters of HS 845521 (the code used for hot rolling mill) in UN Comtrade data were China ($269M, 49% of world exports), Germany ($105M) and Italy ($98M). World exports came to about $553M, 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 hot rolling mill (HS 845521)?
In 2025, the top importers of HS 845521 (the code used for hot rolling mill) in UN Comtrade data were Mexico ($193M, 22% of world imports), India ($142M) and Brazil ($121M). World imports came to about $881M, 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.
Is the HS code for Hot rolling mill the same in all countries?
The base HS code 845521 for Hot rolling mill is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for hot rolling mill in Brazil?
Brazil splits HS 845521 into 2 NCM codes, so the right one for hot rolling mill depends on the product's details: 8455.21.10 (Hot or hot-and-cold rolling mills, plain rolls), 8455.21.90 (Other hot or hot-and-cold rolling mills).