US reinstates Section 232 steel and aluminum tariffs globally at 25%, removing all country exemptions

Mechanism

Section 232 of the Trade Expansion Act of 1962 (19 U.S.C. § 1862) authorises the President to impose import restrictions after the Secretary of Commerce finds that an article is being imported in such quantities or circumstances as to threaten national security. The original findings for steel (2018) and aluminum (2018) remain in place; the 2025 proclamations do not re-run the Commerce inquiry but instead rescind the downstream exclusion arrangements layered on top of those findings.

The Biden-era "alternative measures" structures were:

• EU: A tariff-rate quota (TRQ) agreed in October 2021, limiting

Section 232-free EU steel to ~3.3 mt/year at a 0% rate with a 25% over-quota rate. A separate framework applied to aluminum.

• UK, Japan, Korea: Similar TRQ arrangements reached in 2022.
• Australia: Full exemption in place since the original 2018

proclamation.

• Canada and Mexico: Exempted under the USMCA arrangement.

All of these are revoked. From 12 March 2025, every country including USMCA partners pays 25% on steel and 25% on aluminum with no volume threshold.

The proclamations explicitly invoke national security, supply-chain resilience, and the intent to rebuild domestic productive capacity as justification, citing the Commerce findings and Section 232 authority directly.

Downstream implications

• Canada and Mexico are the largest sources of US steel and

aluminum imports; both now face 25% tariffs that were previously excluded, compounding the fentanyl-tariff pressure (see 2025-02-01-us-trump-fentanyl-tariffs-canada-mexico-china).

• Downstream US manufacturing (auto, aerospace, construction,

appliances) faces an immediate input-cost increase. Automakers with integrated North American supply chains are disproportionately exposed.

• EU and UK steel sectors lose the TRQ access that had stabilised

trade flows since 2021. EU steel association Eurofer signalled potential WTO dispute resolution filings.

• Domestic US steel and aluminum producers (Nucor, Steel Dynamics,

Alcoa, Century Aluminum) benefit from the restored protection; the SLX and XME ETFs reflect this exposure.

• The action is effectively a reversal of the diplomacy-over-tariffs

approach the Biden team pursued, restoring blunt universal rates as a lever for bilateral negotiations rather than as an end-state.

Open questions

• Whether the EU and UK will accept renegotiated TRQ arrangements

under the 90-day tariff-pause framework active for other tariff lines, or pivot to WTO dispute settlement.

• Whether USMCA partners (Canada, Mexico) succeed in carving out a

separate bilateral exemption given integrated North American supply chains and the existing 2025-02-01 fentanyl-tariff pressure.

• Long-run domestic capacity response: US EAF (electric arc furnace)

steel capacity is near full utilisation; a structural increase in capacity requires multi-year investment.