U.S. Steel Board Approves Nearly $3 Billion Hot‑Strip Mill at Braddock's Edgar Thomson Plant

U.S. Steel said its board of directors has approved full funding for a nearly $3 billion hot-strip mill at its Mon Valley Works in Braddock, Pennsylvania, a formal step that turns earlier investment pledges into an authorized project with initial production targeted for late 2029.

The decision matters because it moves the project beyond scenario studies and public promises tied to Nippon Steel’s takeover of U.S. Steel. The company said the new mill at the Edgar Thomson Plant would lift annual hot-rolled steel production capacity to about 3.5 million tons from about 2.2 million tons, a significant expansion at one of its best-known U.S. sites.

U.S. Steel announced the board action on Oct. 22, and parent company Nippon Steel issued a parallel statement the next day. U.S. Steel is now a wholly owned subsidiary of Nippon Steel, which completed its purchase of the company in June 2025 after a U.S. national-security review. Both companies have since said they planned multibillion-dollar investments in U.S. operations.

The companies said construction on the Mon Valley project will begin only after necessary permits are received. No public permit approvals were identified in the company announcements. Nippon Steel said, “Construction will begin after necessary permits are received, with initial production expected in late 2029.”

Mon Valley Works is U.S. Steel’s long-running steelmaking complex outside Pittsburgh, and the new hot-strip mill is planned for the Edgar Thomson Plant in Braddock. Hot-strip mills roll steel into flat products used in manufacturing and other industrial applications. The companies said the modernization plan also includes replacing older equipment, though the central announcement was the board’s approval of full funding for the new mill.

U.S. Steel said the project is expected to support roughly 5,100 to 6,300 jobs across Pennsylvania during construction, citing a June 2026 economic-impact analysis by Parker Strategy Group. But those figures are projections from a company-commissioned study that used company-provided assumptions and modeled earlier $2 billion and $2.5 billion investment scenarios, not the full nearly $3 billion now approved. The study projected about 5,105 to 6,381 jobs and roughly $46.4 million to $58 million in state and local tax revenue, while noting that its in-state economic analysis excluded equipment procurement.

David Burritt, U.S. Steel’s president and CEO, said in the company’s announcement that the investment is meant to secure the region’s long-term role in steelmaking. “For generations, the Mon Valley has built America, and steel has built lives here,” Burritt said. “This nearly $3 billion investment is about making sure that story doesn’t just continue but gets even stronger.”

Scott Buckiso, U.S. Steel’s executive vice president and chief manufacturing officer, called the project a bet on domestic steel production. “The steel this country needs for the future is coming to the Mon Valley today,” he said.

A separate, smaller project is already underway at the site: U.S. Steel has said construction is in progress on an approximately $100 million slag granulator at Edgar Thomson. But the bigger news is the board’s authorization of full funding for the hot-strip mill, which gives the company’s Mon Valley investment plan a defined budget and schedule, even as the start of construction still depends on permits that have not yet been publicly identified as approved.