The Trump administration's 25% tariff on all steel and aluminum imports takes effect this month, with no exemptions for allies and a planned doubling to 50% in June. Here is a complete breakdown of where the US imports these metals from, how much it produces at home, which companies could benefit, and where the retaliation risks lie.
Steel and aluminum are not glamorous commodities, but they are foundational ones. Every car, aircraft, building, bridge, pipeline, appliance, and defence system depends on them. When the United States imposes sweeping tariffs on their import - as the Trump administration has done this month, with a 25% duty across all foreign steel and aluminum and their derivative products - the consequences ripple outward through manufacturing, construction, energy, and consumer goods. This article maps the trade flows that will now face those tariffs, the domestic production landscape that will need to absorb the gap, the investment opportunities the tariffs create, and the retaliatory risks investors in other sectors need to start pricing in.
President Trump's new steel and aluminum tariffs represent a significant escalation beyond the 2018 version of the same policy. The earlier round levied 25% on steel and 10% on aluminum, included a lengthy product exclusion process that allowed thousands of specific items to avoid duties, and ultimately granted quota-based exemptions to key trading partners including Canada, Mexico, the European Union, Australia, South Korea, Japan, and the UK. The 2025 version eliminates all of that. The tariff rate is a flat 25% on all steel and aluminum imports and derivative products, with no product exclusions and no country carve-outs. Every prior exemption agreement the United States struck with major steel and aluminum exporters is terminated.
President Trump signs a proclamation reinstating and expanding Section 232 tariffs on steel and aluminum. Unlike 2018, no country-specific quotas or product exclusion processes are established. The tariff scope is explicitly broader, covering a wider range of downstream derivative products.
All steel and aluminum entering the United States, regardless of country of origin, faces a 25% duty. This includes imports from Canada - the dominant supplier of both metals - as well as allies across the EU, UK, Japan, South Korea, and Australia who previously held negotiated exemptions. Steel and aluminum derivative products such as nails, pipes, auto parts, and aluminium foil are also captured.
The administration has announced a further escalation to 50% tariffs on all steel and aluminum imports, planned for June 2025. If implemented as announced, this will be the highest peacetime tariff rate on these commodities in modern US trade history. The combination of 50% duties and zero exemptions will create significant cost pressure throughout the US manufacturing supply chain.
Key difference from 2018: The 2018 steel and aluminum tariffs allowed product exclusions - individual importers could apply to have specific products exempted if no domestic alternative existed. Those exclusions covered a large share of affected trade volume. The 2025 tariffs have no exclusion process, meaning every imported steel and aluminum product, regardless of whether a US-made equivalent exists, faces the full duty. This is a materially harder policy with far broader supply chain implications.
Despite being the world's fourth-largest producer of raw steel, the United States imports a meaningful share of the steel it consumes - approximately 13% of total steel use in 2024. Total steel imports in 2024 ran to roughly 26 million metric tons. The country's import relationships for steel are long-established and deeply integrated into domestic supply chains, particularly for specialty grades and sheet products that domestic mills have historically not produced at sufficient scale.
★ Canada is the largest steel supplier by a wide margin. Source: U.S. International Trade Commission, Steel Import Monitor (2025).
Canada's role as the US's dominant steel supplier - at approximately 23% of all steel imports - makes the absence of a Canadian exemption particularly significant. Steel imports from Canada have hovered between 5 and 6 million metric tons consistently for over a decade, reflecting deeply integrated cross-border supply chains in the automotive, construction, and energy sectors. Canadian steel now faces the same 25% tariff as steel from any other country, a dramatic departure from the US–Canada trade relationship and a direct challenge to the integrated North American manufacturing model.
Brazil, the second-largest steel supplier, sends primarily semi-finished slabs that US mills process into finished products - a supply chain structure that means Brazilian tariffs will raise costs at the mill level, not just at the import dock. Mexico, third at roughly 12% of imports, is heavily integrated through USMCA supply chains, with steel flowing across the border in multiple stages of automotive and industrial manufacturing.
One notable shift over the past decade: Chinese steel imports have been dramatically reduced already, falling from 8% of US steel imports in 2014 - when they peaked at 2.9 million metric tons - to just 1.8% in 2024. This was the result of previous US tariffs and trade remedies targeting Chinese dumping. The new 2025 tariffs therefore have minimal additional impact on the China–US steel relationship; the real disruption falls on allies Canada, Brazil, Mexico, South Korea, and the EU.
Aluminum tells a more acute dependency story. While US steel imports cover roughly 13% of domestic consumption, aluminum imports covered 47% of US consumption in 2024 - nearly half. This is a fundamental structural reality: the United States has allowed its primary aluminum smelting capacity to shrink dramatically over the past two decades, driven out by high energy costs and lower-cost competition, particularly from China. The tariffs arrive into a domestic production landscape that is simply not equipped to absorb a meaningful share of the import volume being tariffed.
★ Canada supplies 58% of all US aluminum imports - by far the highest concentration of any single supplier in either metal category. Source: U.S. International Trade Commission, Aluminum Import Monitor (2025).
Canada's dominance in aluminum is even more pronounced than in steel. Canadian aluminum accounts for approximately 58% of all US aluminum imports - and since Canada as a whole received a prior exemption under the 2018 tariff regime, that volume had been flowing duty-free for years. Placing a 25% tariff on Canadian aluminum is therefore a structural shock to US aluminium consumers, with no short-term domestic substitution available at the scale required.
The UAE, the second-largest supplier, provides around 9% of aluminum imports - a meaningful but manageable share. Chinese aluminum imports have also declined sharply in recent years, falling by roughly two-thirds from their 2017 peak of 643,000 metric tons to approximately 222,000 metric tons in 2024, driven by prior US trade actions. As with steel, the new tariffs fall primarily on allied and friendly trading nations rather than China - the original stated target of Section 232 national security trade measures.
The rationale behind tariffs on nationally strategic commodities is straightforward - to incentivise domestic production. The question is whether the US industrial base can realistically respond, and on what timeline. For steel and aluminum, the answers differ materially.
★ US is 4th-largest steel producer globally; its aluminum production has declined sharply from a 2019 peak of 1.1M mt. Source: U.S. Geological Survey (2025).
On steel, the United States is a meaningful global producer - 81 million metric tons of raw steel in 2024, up from 72.7 million metric tons in 2020, making it the world's fourth-largest producer behind China, India, and Japan. US steel capacity is dominated by electric arc furnace (EAF) producers - the so-called mini-mills - which are more flexible and faster to scale than traditional blast furnace operations. Historical data from 2018 and 2019 shows that US steel production did increase when tariffs were in effect - rising approximately 5-7% from around 81-82 million metric tons in 2017 to roughly 86-87 million metric tons by 2018-2019, with capacity utilisation climbing from around 73% to roughly 80% by late 2018 - suggesting some supply-side response is achievable. However, adding meaningful new capacity requires substantial capital investment and years of infrastructure and permitting timelines.
The aluminum picture is more concerning. US primary aluminum production has fallen to just 670,000 metric tons in 2024, down sharply from over 1 million metric tons in 2020 and 1.1 million metric tons in 2019. The US has the installed smelter capacity to produce 1.36 million metric tons of primary aluminum annually - but is currently operating at roughly half that capacity. High domestic electricity costs relative to international competitors, particularly Gulf state producers and China, have made US aluminum smelting economically unviable without price support. Only two companies currently produce primary aluminum in the United States at scale: Alcoa and Century Aluminum, operating across four active smelters combined.
Tariffs of this scale create clear winners among domestic producers who can sell into a protected market at higher prices. The most direct beneficiaries are the two companies currently producing primary aluminum in the United States, and the broader domestic steel sector whose members now face reduced foreign price competition.
Alcoa is the largest primary aluminum producer in the United States and one of the oldest names in the global aluminum industry. Its domestic smelting operations - which have faced persistent pressure from high energy costs - become significantly more competitive when foreign aluminum faces a 25% tariff at the border. Alcoa also holds bauxite mining and alumina refining operations that provide upstream integration. For investors, Alcoa is the most direct equity play on higher domestic aluminum prices driven by the tariffs, though its profitability remains sensitive to global LME aluminum prices and energy input costs.
Century Aluminum operates across several of the four active primary aluminum smelters remaining in the United States. Like Alcoa, it has operated under significant cost pressure as cheap imported aluminum - particularly from Canada and the Middle East - compressed domestic price realisations. A 25% tariff on Canadian aluminum, which had previously entered duty-free, materially changes that competitive dynamic. Century Aluminum is a higher-beta play than Alcoa - smaller, more operationally concentrated in primary smelting, and therefore more sensitive to both the upside from tariff protection and the downside from any energy cost escalation or tariff reversal.
The domestic steel sector is broader, encompassing major integrated producers like Cleveland-Cliffs and Nucor alongside regional mini-mill operators. These companies benefit from tariff-driven reductions in import competition and from any price increases that flow from constrained supply. However, the 2018 experience taught that the benefit is not unlimited - steel-consuming industries (automotive, construction, appliances, energy infrastructure) face higher input costs, reducing demand and potentially lobbying for relief measures that erode the tariff's protective effect over time.
The 2018 steel and aluminum tariffs triggered retaliatory measures from every major trading partner that was impacted - and those retaliatory measures were specifically designed to inflict economic and political pain on US export sectors. The EU targeted American bourbon, Harley-Davidson motorcycles, blue jeans, and agricultural products. Canada targeted US steel, aluminum, and an array of food products. China targeted soybeans, pork, and other agricultural commodities. The pattern was consistent: retaliation was calibrated to hit politically sensitive sectors in key US states, particularly agricultural heartland states.
| Trading Partner | 2018 Retaliation Targets | 2025 Risk Level | Most Exposed US Sectors |
|---|---|---|---|
| Canada | Steel, aluminum, food products, consumer goods | Highest | Agriculture, consumer goods, energy |
| European Union | Bourbon, motorcycles, denim, orange juice, agricultural goods | High | Spirits, agriculture, manufacturing |
| Mexico | Steel, pork, cheese, fruit, agricultural goods | High | Agriculture, pork, dairy |
| China | Soybeans, pork, aircraft, autos | Moderate | Agriculture, aerospace (already tariffed) |
| South Korea / Japan | Limited; both secured quota agreements in 2018 | Elevated | Autos, electronics, agriculture |
With the 2025 tariffs carrying no exemptions for Canada, Mexico, or the EU - all of whom had negotiated protections in 2018 - the scope for retaliatory response is wider than in the previous round. Canada in particular faces a significant economic shock from tariffs on its steel and aluminum exports to the US, and its retaliatory capacity is substantial given the depth of cross-border trade integration. Investors in US agricultural exporters, spirits companies, and consumer goods manufacturers with significant export revenues should be examining their exposure to each of these trading partners and reviewing the 2018 retaliation lists as a guide to where the next round of countermeasures may fall.
Sources: U.S. International Trade Commission - Steel Import Monitor (2025); U.S. International Trade Commission - Aluminum Import Monitor (2025); U.S. Geological Survey - Aluminum Statistics and Information (2025); U.S. Geological Survey - Iron and Steel Statistics and Information (2025).
Research, PolyMarket Investment Strategies, March 5, 2025