US facility · Steel
Nippon Steel's U.S. Steel commits nearly $3 billion to Mon Valley Works for a new hot strip mill
- Company
- Nippon Steel (via U.S. Steel) (Tokyo)
- Project
- Mon Valley Works (new hot strip mill at Edgar Thomson Plant), Braddock, Pennsylvania
- Value
- Nearly $3B (raised from up to $2.5B in June)
- Status
- The U.S. Steel board approved full funding of nearly $3 billion on October 22, 2026. Construction starts once permits are received, with first production expected in late 2029. Yearly capacity rises from about 2.2 million to about 3.5 million tons.
- Date
- 2026-06-08
U.S. Steel plans nearly $3 billion of capital spending (first set at up to $2.5 billion in June 2026) at Mon Valley Works near Pittsburgh, centered on a new hot strip mill at the Edgar Thomson Plant in Braddock. The mill will replace an 87-year-old line at the Irvin Plant and target automotive and other high-value grades. The company projects up to 6,381 jobs and $1.7 billion of economic impact in Pennsylvania over three years.
Why it matters
Jiji reported the amount as more than double Nippon Steel's original Mon Valley commitment. It answers a key political promise behind the US Steel takeover: that the historic Pittsburgh-area mills would be modernized, not wound down. Jiji says it will be the largest project under Nippon Steel's pledge to invest $11 billion in U.S. Steel by 2028. The amount rose from the June plan because of higher labor costs and inflation.
The investment
U.S. Steel announced the plan on June 8, 2026. It said it was weighing two versions of the project, one costing about $2 billion and one about $2.5 billion. Nippon Steel had committed before the takeover closed to spend at least $1 billion at Mon Valley Works. On October 22, 2026, U.S. Steel's board approved full funding of nearly $3 billion.
Besides the new hot strip mill at Edgar Thomson in Braddock, the plan includes a slag recycler to support it. The old mill at the Irvin Plant in West Mifflin is to be decommissioned, although the company has not given a date. The project is part of the roughly $11 billion Nippon Steel has pledged to invest in U.S. Steel's US operations by 2028.
Timeline
At a community open house in Braddock in July, the company said it expects production at the new mill by 2029, Axios reported. The slag recycler was set to break ground in September 2026. No start date had been set for mill construction, and the company was working on air and water permits.
Economic effects
The economic impact study released with the plan projects up to $58 million in state and local tax revenue, alongside the job and output figures. Union officials in Minnesota's Iron Range said Mon Valley uses iron ore pellets from U.S. Steel's Minntac and Keetac mines, so the upgrade supports demand there too.
What to watch
Local environmental groups have criticized the plan. The Breathe Project said it keeps investment in coal-based steelmaking, and PublicSource reported a Carnegie Mellon CREATE Lab analysis that moving the mill to Edgar Thomson would put nearly 5,000 more residents in the plant's main pollution zone. The permit process is the next step to follow.
Sources
Kakehashi M&A News home
