Nucor has produced the first prime coil on the new continuous galvanizing line at its Berkeley sheet mill in Huger, South Carolina, moving the roughly $425 million project from commissioning into production. The line adds about 500,000 short tons per year of hot-dip galvanized, galvannealed and zinc-aluminium-magnesium coating capacity, with a product range aimed squarely at exposed automotive and advanced high-strength steel (AHSS) grades.
The milestone matters less as a construction story than as a qualification and ramp-up story. Nucor's own guidance puts the line at roughly 50% utilization by the second quarter of 2027 and at full run rate only by the end of that year — a long, deliberate climb that reflects how automotive coating lines are brought into service.
What was built, and by whom
The line is an addition inside an existing, operating flat-rolled mill rather than a greenfield site. Berkeley already runs two electric arc furnaces and substantial hot-band and cold-rolling capacity, which is the strategic point: the new coater converts the mill's own cold-rolled substrate into higher-value coated product.
| Attribute | Detail |
|---|---|
| Location | Nucor Steel Berkeley, Huger, Berkeley County, South Carolina |
| Capacity | ~500,000 short tons/year |
| Max width | Galvanized product up to 72 inches |
| Products | GI, GA and Zn-Al-Mg coated steel, including exposed automotive and AHSS grades |
| Investment | $425 million (approved 2022) |
| Jobs | More than 50 new full-time positions |
| First prime coil | Reported early November 2026 |
| Ramp-up target | ~50% utilization Q2 2027; full rate by end-2027 |
Primetals Technologies led the plant supply, with overall engineering and responsibility for the vertical galvanizing furnace (with galvanneal capability), after-pot cooling, quench technology, and the complete automation package — drives, furnace model and scheduling — plus power solutions including a new incoming substation. Local pre-assembly, installation support and equipment modification were handled through Primetals' service workshop at Huger.
Clecim SAS, the French mechanical equipment specialist, acted as Primetals' partner on key mechanical scope and supplied the laser welder, skin-pass mill and tension leveler, dual shiftable roll coaters, side trimmer and scrap chopper, and flying shear. Clecim has documented factory acceptance testing for those packages. Trade reporting attributes the automotive metallurgy capability in part to Primetals' transverse flux induction heating and rapid cooling technology; that specific attribution comes from trade press rather than a Nucor or Primetals release I could verify, so treat it as reported rather than confirmed.
No general EPC contractor has been disclosed. The structure — a mill owner buying a coordinated equipment and automation package from a technology supplier, with installation support run from a local workshop — is consistent with Nucor's in-house project-execution model, though that reading is inference, not a stated fact.
Schedule: roughly a year and a half behind original plan
The project was announced in September 2022 with an original completion target of mid-2025, backed by a South Carolina job development credit package and a $400,000 state Set-Aside grant to Berkeley County for site preparation, alongside a fee-in-lieu-of-tax agreement and utility support from Santee Cooper. By Nucor's 2025 investor materials the commissioning date had slipped to the second half of 2026; mid-2026 overview decks still listed a mid-2026 completion with roughly $110 million of 2026 capital spending remaining. Nucor's Q3 2026 earnings call confirmed production started in early October 2026, and the first prime coil was reported in early November.
The slippage is worth noting for anyone benchmarking comparable coating-line projects, but it is not unusual for automotive-grade lines, where cold commissioning and product qualification dominate the timeline.
Why it matters commercially
The strategic logic is about mix rather than volume. Nucor's sheet mills have grown hot-band and cold-rolled capacity substantially; coating capacity that can serve exposed automotive body panels and AHSS structural parts is where the margin premium sits. A 500,000-ton line with 72-inch width capability and Zn-Al-Mg capability puts Berkeley in direct competition for North American automotive coating business long dominated by integrated producers and a small number of specialised coaters.
The slow ramp-up is the number to watch. Automotive qualification is customer-by-customer and grade-by-grade, and exposed-panel approvals are the slowest of all. Nucor's own guidance of full run rate by end-2027 means the line will be a modest earnings contributor through 2027, with the real test in 2028.
For suppliers, the primary capital packages on the line are effectively closed. Equipment supply, automation, drives and the incoming substation were contracted to Primetals and Clecim, and the line is now operating. What remains is routine operating procurement — rolls, spares, consumables and maintenance services — for which there is no evidence of open tender activity. Any future expansion of the Berkeley coating complex would be a separate, unannounced decision; nothing in the public record indicates one.
On the steel side, the line is a demand signal of a different kind: it consumes Berkeley's own cold-rolled substrate, so its ramp-up raises internal substrate requirements rather than creating a new external steel buyer.
What to watch
- Qualification progress on exposed automotive grades — the gating factor for the 50% and full-rate targets.
- Zn-Al-Mg commercial uptake — a higher-value product where North American capacity remains comparatively thin.
- Whether Nucor discloses line-level commentary on the Q4 2026 and 2027 earnings calls, which would give the first real read on ramp economics.