Trump Rewrites the Rules on Metal Imports Section 232: Part 1

The Section 232 proclamation that President Trump signed on April 2 and took effect at 12:01 a.m. EDT on April 6 is the most significant structural overhaul of America’s metals tariff regime since its inception. It replaces the single flat-rate model with a five-tier system spanning 985 HTSUS codes, shifts duty assessment from metal-content value to full customs value, and formally integrates copper into the same framework as steel and aluminum. The White House fact sheet frames it as closing loopholes and reinforcing national security. For importers, the math on every shipment of metal-bearing goods changed overnight.

The headline rates are 50% on primary metal articles, 25% on derivatives, 15% temporarily on certain grid and industrial equipment through 2027, and 10% on products manufactured using U.S.-origin metal. But the rate structure tells only part of the story.

The most consequential change is not a rate. It is a methodology. Under the prior regime, Section 232 tariffs on derivative articles applied only to the declared value of the metal content, with a separate duty on the non-metal portion. Importers had long exploited this structure by declaring artificially low metal values to reduce exposure. Trade law firm ArentFox Schiff noted that eliminating this distinction was a primary objective of the proclamation.

Now, every tariff tier applies to the full customs value of the imported product, regardless of how much metal it actually contains. The practical impact is dramatic. A $100 imported product containing $10 of steel previously paid 50% on $10 — a $5 duty. Under the new structure, classified as a derivative in Annex I-B, it pays 25% on $100 — a $25 duty, five times higher. The National Law Review observed that for many products, the impact comes less from the nominal rate and more from the shift to full-customs-value methodology.

The proclamation does provide meaningful relief in certain areas. A new de minimis threshold under Annex IV exempts products outside Chapters 72–76 that contain 15% or less steel, aluminum, or copper by weight. An anti-stacking rule ensures that products containing multiple covered metals pay only the single highest applicable rate — not a stacked combination. And 247 HTSUS codes covering consumer goods, chemicals, certain engine components, motor vehicle parts, and furniture components were removed entirely under Annex II, representing $183 billion in 2024 import value stripped from Section 232 scope. Global Trade Alert’s trade-weighted analysis found that the average U.S. tariff actually fell by 0.53 percentage points across the full universe of affected goods — though that average masks enormous variation at the product level.

For customs brokers and compliance teams, GHY International’s guidance summarizes the operational requirements: precise metal composition percentages by weight, country-of-origin verification for the metal itself, and classification under the correct annex. ACE entries must now reflect new Chapter 99 headings, 9903.82.02 through 9903.82.17.

The pricing data confirms that the tariff premium is real and widening. U.S. hot-rolled coil traded at approximately $1,010–$1,030 per short ton in early April, up 31.8% year-over-year. Asian HRC sat at roughly $481 per short ton at origin — but with freight and the 50% Section 232 duty, the landed cost approaches $812 per short ton, keeping domestic supply the default for most buyers.

Aluminum is telling an even more dramatic story. The U.S. Midwest Premium — the surcharge domestic buyers pay above the London Metal Exchange price — hit a record $1.005 per pound in January 2026, more than doubling since the 50% tariff took effect. Combined with the LME base price, U.S. buyers are now paying above $5,000 per metric ton for physical aluminum, a 68% premium over the global benchmark. The Aluminum Association has warned that this rate level threatens to undermine the very industry the administration aims to protect, citing that roughly two-thirds of U.S. primary aluminum supply comes from Canada because domestic smelting capacity and energy supply are structurally insufficient to meet demand.

FTZs lose their last tariff-engineering advantage

The proclamation also closes the Foreign Trade Zone play. All covered products admitted to U.S. FTZs on or after April 6 must enter under privileged foreign status (19 CFR 146.41), which locks in the tariff classification and rate at the time of admission. The tariff inversion strategy — routing goods through an FTZ to reclassify them into a lower-duty finished category — is effectively gone. FTZs still offer duty deferral, weekly entry processing, and logistics efficiencies, but not duty reduction on these goods.

The proclamation also contains no on-the-water exception, meaning shipments that departed before April 6 but arrive after the effective date are subject to the new rates.

Part 2 covers sector-by-sector impacts, copper’s formal entry into Section 232, the UK preferential rate, and how supply chains are responding.