Nucor's real margin lever isn't blast-furnace utilization — it's a twice-yearly Commerce Department window where steelmakers petition to pull more of Caterpillar's and Eaton's imported components under the 25% Section 232 tariff wall.
Everyone watches hot-rolled coil prices to read Nucor. Wrong chart. The mechanism that actually moves NUE's margin lives inside a bureaucratic side door most investors have never heard of: the Section 232 steel "inclusions" process. Commerce killed the old exclusion-request system in February 2025 — no more downstream users petitioning to escape the tariff. What replaced it runs the opposite direction: three two-week windows a year (May, September, January) where anyone, including steelmakers themselves, can petition Commerce to add more derivative products — finished goods made from steel — onto the tariffed list. Nucor has been one of the most aggressive filers. The first cycle alone added 400-plus HTS codes. Every code that lands on that list means an importer's landed cost jumps 25%, and every domestic mill selling a substitutable product gets a price umbrella it didn't have to build a single new furnace to earn. That's the real driver behind NUE's Q1 2026 gross margin doubling to 16% while import share of the U.S. market fell from 22% to 15%: it's a docket outcome, not a demand cycle.
Who cashes in:
- NUE — Nucor is the direct petitioner. Every derivative product it gets included tightens the addressable market for its plate, bar, and sheet products and widens the "metal margin" spread Nucor itself flagged as the Q1 driver.
- VMC / MLM — Vulcan Materials and Martin Marietta don't touch the steel docket directly, but they benefit from the same policy architecture: tariff-protected input costs get passed straight into public infrastructure bids (IIJA-funded), where aggregates pricing rides alongside steel rebar costs with little elasticity pushback from state DOTs.
- PWR — Quanta Services builds the grid and pipeline infrastructure that consumes tariff-protected steel and specialty poles; as a service/EPC contractor it passes material inflation through cost-plus and unit-price contracts rather than absorbing it, effectively monetizing the same tariff wall Nucor benefits from.
Nucor's margin doesn't come from the blast furnace — it comes from a twice-yearly Commerce Department comment window that decides whose imported parts get a 25% price umbrella built around them.
Who is exposed:
- CAT — Caterpillar imports engineered steel components and castings for construction and mining equipment; the Association of Equipment Manufacturers has publicly urged Commerce to reject Nucor-driven inclusion petitions covering exactly the derivative parts CAT sources, because each addition is a direct input-cost hike with no exclusion valve left to escape it.
- ETN — Eaton's electrical and hydraulics components run through the same derivative-product exposure as CAT: steel-intensive enclosures and structural parts can be swept into scope with each inclusions window, and there's no more individual-company exclusion filing to blunt it.
- J / FLR — Jacobs and Fluor, as engineering/construction firms bidding fixed-price or guaranteed-maximum contracts on industrial projects, absorb steel-derivative cost surprises mid-build when a component gets added to the tariff list after bids are locked.
The play: Don't model Nucor off capacity utilization — model it off the BIS inclusions docket at regulations.gov/docket/BIS-2025-0023. Each May/September/January filing window is a scheduled, dated catalyst for NUE's forward pricing power, and a scheduled cost-shock risk for CAT and ETN's component sourcing.
What to watch: the next inclusions window and whether AEM-aligned comment filings succeed in keeping equipment castings and derivative parts off the expanded list — that outcome, not steel demand, is what sets the spread.
Source: original report ↗
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