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U.S. imports of alumina refining & primary aluminum production (NAICS 331313) totaled $892.8M in July 2026, traded with 47 countries.
Importers of Alumina Refining & Primary Aluminum Production paid $407.2M in duties in July 2026 — an effective duty rate of 47% on $868.1M in dutiable value, based on actual customs collections rather than the published tariff schedule. Alumina Refining & Primary Aluminum Production imports of $892.8M in July 2026 ran 11% below the year-to-date monthly average of $1.0B.
Last updated: July 2026 dataAlumina — the calcined aluminum oxide intermediate refined from bauxite — and primary aluminum produced via electrolytic reduction are the foundational upstream inputs for the entire aluminum supply chain. NAICS 331313 captures both the Bayer-process refining of alumina and the Hall-Héroult smelting that converts it to unwrought metal, two energy-intensive steps that heavily influence global sourcing decisions. Section 232 measures apply to primary aluminum imports, and trade professionals must track country-of-origin carefully, as exemption status and quota thresholds differ by supplier nation.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
3.4K shipments/mo
Section 232 tariffs target aluminum articles, and the applicability to alumina as a precursor input versus a finished aluminum product can depend on specific HTS classification. Importers should consult a licensed customs broker to confirm whether their alumina shipments fall within the scope of Section 232 or are classified as a chemical intermediate outside its reach.
Country-of-origin determinations for primary aluminum generally require a certificate of origin and, where applicable, a mill certificate identifying the smelter. Given that Section 232 exemptions and quotas are origin-specific, accurate documentation of the smelting country — not just the shipping country — is critical to correct duty assessment.
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National industry 1 of 4 in naics industry 33131
National industry 331313 · $892.8M of $2.2B
Imports · July 2026
origin
Canada and Argentina together supply 72% of it.
customs district
Census does not publish district detail for this classification system.
destination
None recorded for this period.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$892.8MYoY · Pro
Exports
$172.1MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.