Steel Dynamics Inc

2025 crude steel production

10.70 MtWorld Steel Association

FY2025 revenue

$18.18BDecember 31, 2025 · SEC XBRL

TRI facility leads

192024 U.S. match, unresolved

TRI listed-chemical volume classified recycled on/off-site

112.0M lb93% of matched 2024 TRI management volume; not the company-reported EAF-mill waste rate

Top TRI chemical

Zinc compoundsBy managed weight, Butler, IN flat-roll division

Public evidence, arranged around Steel Dynamics’ physical production system rather than the corporate org chart. Steel Dynamics is an electric-arc-furnace (EAF) mini-mill steelmaker running on recycled scrap, and it has publicly diversified beyond steel into a second metal: aluminum, through its Aluminum Dynamics flat-rolled recycling and rolling business.

01 · MATERIALS IN

Recycled steel & aluminum scrap

Ferrous scrap feeds EAF steelmaking. Aluminum operations use both raw aluminum (P1020) and recycled scrap, with content varying by product, alloy and customer application. Source

02 · MAKE

EAF mini-mills & a new aluminum rolling mill

Steel Dynamics’ FY2025 Form 10-K describes a 650,000-metric-ton flat-rolled aluminum products mill in Columbus, Mississippi, a joint venture with Unity Aluminum in which Steel Dynamics reports a 94.4% controlling equity interest. Aluminum inputs include both raw aluminum (P1020) and recycled aluminum scrap; recycled content varies by product, alloy and customer application. This mill is one asset within the aluminum operations, not the full segment footprint. Source

03 · PRODUCTS OUT

10.70 Mt crude steel (2025), plus aluminum sheet

Flat-roll, structural, and specialty steel products, plus flat-rolled aluminum products, whose recycled content varies by product and alloy. See the Steel & Aluminum Dynamics section for detail.

04 · REPORTED TRI MANAGEMENT

Listed-chemical streams

The 2024 TRI match reports about 112.0M lb in its on- or off-site recycling category across 19 parent-name-matched U.S. facility leads, or 93% of the managed listed-chemical volume in that dataset. This is not a company-wide recycling rate or total physical waste quantity. Separately, Steel Dynamics reports that 59% of waste generated at its seven EAF steel mills was recycled in 2024.

What is public now

Ticker / CIK NASDAQ: STLD · SEC CIK 0001022671

2025 crude steel production & FY2025 revenue 10.70 million tonnes (World Steel Association); $18.18B revenue, period ended December 31, 2025 (SEC XBRL)

Production model Electric-arc-furnace (EAF) mini-mill steelmaking on recycled scrap, the same structural model as Nucor, plus a newly diversified Aluminum Dynamics recycling and flat-rolled aluminum business

Public plant signal 19 U.S. facilities matched to a Steel Dynamics parent name in the 2024 TRI dataset; the Butler, IN flat-roll division is the top-volume named lead

What the public record tells us

Steel Dynamics’ FY2025 Form 10-K describes a 650,000-metric-ton flat-rolled aluminum products mill in Columbus, Mississippi, a joint venture with Unity Aluminum in which Steel Dynamics reports a 94.4% controlling equity interest. Aluminum inputs include both raw aluminum (P1020) and recycled aluminum scrap; recycled content varies by product, alloy and customer application. This mill is one asset within the aluminum operations, not the full segment footprint. Source

The imported World Steel Association figure is 10.70 million tonnes of 2025 crude steel production. It is production context, not opportunity sizing.

Two different 2024 measures: The TRI match classifies 93% of managed listed-chemical volume across 19 matched U.S. facility leads in on- or off-site recycling categories. Steel Dynamics separately reports 59% recycled for waste generated across its seven EAF steel mills. These populations and denominators differ, so the percentages are not directly comparable; neither describes all company materials.

Regulatory and certification signals

Regulatory watchlist Clean Air Act EAF NESHAP rules, RCRA hazardous-waste management (EAF dust), TRI listed-chemical reporting

Certification & reporting families ISO 14001 site-level environmental management, company sustainability/ESG reporting

How to use this view Full detail sits in the Regulatory section: connect each requirement to a named mill or the Aluminum Dynamics site before treating it as applicable

Innovation and recovery signals

Material innovation Aluminum Dynamics extends recycled-content circularity into a second metal; publicly reported recycled-scrap inputs, with no disclosed facility-level sourcing need or grade specification

Recovery pathways Zinc-bearing dust and mill-scale recovery at steel mills; aluminum scrap processing at the new Columbus, MS facility

Steel Dynamics’ aluminum operations have a distinct asset perimeter and raw-material mix from its steel operations. Source

EAF steel mills: the established business

Steel Dynamics operates multiple electric-arc-furnace steel mills producing flat-roll, structural, rail, merchant bar, and specialty steel products, melting recycled ferrous scrap rather than reducing virgin iron ore. This is the same EAF/scrap-based structural model as Nucor’s, and the same “secure and upgrade an already-circular supply” framing applies: the lever is scrap quality and sourcing, not finding a substitute for a virgin material.

Aluminum Dynamics: the new platform

Steel Dynamics’ FY2025 Form 10-K describes a 650,000-metric-ton flat-rolled aluminum products mill in Columbus, Mississippi, a joint venture with Unity Aluminum in which Steel Dynamics reports a 94.4% controlling equity interest. Aluminum inputs include both raw aluminum (P1020) and recycled aluminum scrap; recycled content varies by product, alloy and customer application. This mill is one asset within the aluminum operations, not the full segment footprint. Source

As of September 17, 2026, Steel Dynamics said all three Columbus cold mills were operational and the first of two CASH lines was operating. Commercial shipments from that line were expected in Q4 2026; the second line was expected to produce customer-qualification material before year-end 2026. Those shipment and qualification milestones are forecasts. Source

Named steel facility: Butler, IN flat-roll division

Steel Dynamics Inc-Flat Roll Div, Butler, IN is this brief’s top-matched 2024 TRI facility lead by managed weight (zinc compounds), consistent with galvanizing and coating operations on flat-rolled steel products. This is a candidate facility lead from parent-name matching, excluded from any owned/operated plant count until ownership and operating control are verified.

Steel Dynamics does not publicly itemize feedstock volumes by mill or platform in this source set. The table below maps directional material families to known production-route disclosure, using TRI data as the anchor point for steel.

Financial & production scale context

$18.18B FY2025 revenue (period ended December 31, 2025, SEC XBRL) and 10.70 million tonnes of 2025 crude steel production (World Steel Association) provide two independent scale anchors, covering the steel business; Aluminum Dynamics’ specific revenue contribution is not broken out in this source set. A reported cost proxy is stale or unavailable; request current spend evidence directly.

Material transition focus

The filing identifies P1020 and recycled aluminum scrap as aluminum inputs. It does not establish an unmet sourcing need or a Material Transition relationship. Source

Publicly described product families spanning Steel Dynamics’ established steel business and its newer aluminum platform.

Flat-roll steel

Hot-rolled, cold-rolled, and coated flat steel, including galvanized products from the Butler, IN division.

Automotive, appliance, construction

Structural & rail steel

Structural shapes and rail products for construction and rail infrastructure.

Construction, rail infrastructure

Merchant bar & specialty steel

Bar and specialty steel products for industrial and manufacturing customers.

Industrial manufacturing

Flat-rolled aluminum products

Steel Dynamics’ FY2025 Form 10-K describes a 650,000-metric-ton flat-rolled aluminum products mill in Columbus, Mississippi, a joint venture with Unity Aluminum in which Steel Dynamics reports a 94.4% controlling equity interest. Aluminum inputs include both raw aluminum (P1020) and recycled aluminum scrap; recycled content varies by product, alloy and customer application. This mill is one asset within the aluminum operations, not the full segment footprint. Source

Automotive, packaging (target markets)

Steel fabrication & downstream products

Downstream fabricated steel products.

Construction, industrial

Metals recycling (scrap processing)

Ferrous and non-ferrous scrap processing supporting both the steel and aluminum platforms.

Internal feedstock and merchant scrap sales

Product and application signal

As of September 17, 2026, Steel Dynamics said all three Columbus cold mills were operational and the first of two CASH lines was operating. Commercial shipments from that line were expected in Q4 2026; the second line was expected to produce customer-qualification material before year-end 2026. Those shipment and qualification milestones are forecasts. Source

2024 TRI data gives a facility-level, U.S.-only view of Steel Dynamics’ listed-chemical reporting, concentrated at the Butler, IN flat-roll division. Aluminum Dynamics is newer and may not yet carry a full reporting year in this dataset.

Top named U.S. TRI facility lead (parent-name match, unresolved)

This is a candidate facility lead from parent-name matching against 2024 U.S. TRI records, excluded from any owned/operated plant count until ownership and operating control are verified.

National TRI footprint (2024, aggregate across 19 matched facilities)

Facilities matched to Steel Dynamics parent name 19

Total listed chemicals reported (aggregate) 120,009,256 lb

2024 TRI listed-chemical volume classified recycled on- or off-site (aggregate) 112,038,615 lb · 93% of matched-record management volume; not the company-reported EAF-mill waste rate

Treated (aggregate) 3,386,811 lb

Energy recovery (aggregate) 2,755,525 lb

On-site release (aggregate) 247,336 lb

Off-site transfer (aggregate) 1,580,970 lb

PFAS-listed forms reported 0

The 93% figure is the share of matched 2024 TRI managed listed-chemical volume classified in on- or off-site recycling categories. It is not a company-wide or steel-production recycling rate. Steel Dynamics’ separate sustainability disclosure reports that 59% of waste generated at its seven EAF steel mills was recycled in 2024. The datasets use different boundaries and denominators. Neither figure measures scrap feedstock or a specific plant recovery yield.

Two-metal comparison signal

The 2024 matched steel records do not establish aluminum-specific residual quantities or the current Columbus commissioning status.

Zinc-compound signal

Zinc compounds as the top-reported chemical at the Butler, IN flat-roll division is consistent with galvanizing or coating-line operations, the same chemical family, and likely comparable process origin, as Nucor’s top-reported chemical.

Scope limitation

TRI parent-name matching only reaches U.S. facilities filed under a Steel Dynamics parent name and only covers the specific listed chemicals tracked in this source set. It is not a complete emissions or waste inventory for the company’s full footprint, and Aluminum Dynamics-specific residual data is not separately broken out here.

The sources reviewed do not establish a site-qualified material stream, unmet sourcing need, buyer, offtake, pilot or Material Transition relationship. Plant-level quantities, specifications, recovery yields and commercial demand remain unresolved.

Steel Dynamics’ U.S. regulatory throughline closely mirrors Nucor’s: Clean Air Act EAF rules and RCRA hazardous-waste management, now extended to a second production platform in aluminum.

Regulatory applicability has not been adjudicated per site here. This is a watchlist, not a legal conclusion.

Certification & reporting families in play

Certificate scope and current status are not verified here. Certification-family relevance does not prove an active, in-scope certificate at any named mill.

Innovation & capacity signals

Aluminum Dynamics Columbus flat-rolled aluminum mill: reported 94.4% controlling JV interest; inputs include raw aluminum (P1020) and recycled scrap. Source

TRI listed-chemical management categories 93% of managed listed-chemical volume across 19 matched U.S. facility leads was classified in on- or off-site recycling categories; not the company-reported EAF-mill waste rate

World Steel Association data 10.70 million tonnes of 2025 crude steel production provides independent global-scale context

The aluminum filing and September guidance describe asset scope, mixed inputs and a dated startup status. They do not establish an unmet feedstock need, pilot, buyer or joint certification program.