CHANGE: Once on the Brink, U.S. Steel’s Oldest Plant Is Getting a Big Renovation.

Tokyo-based Nippon Steel, which bought U.S. Steel last year in a controversial deal, said it expects to spend $2 billion to $2.5 billion at Mon Valley Works over the next three years to replace the equipment that rolls steel. The investment is more than double Nippon Steel’s original cost estimate for the project.

Replacing the current 88-year-old hot-strip mill at Mon Valley will lead to more domestically produced steel. The work is expected to generate as many as 6,000 jobs and up to $1.7 billion in economic activity for Pennsylvania, company executives said.

“The Mon Valley project will go a long way to make people feel like there’s a future here,” U.S. Steel Chief Executive David Burritt said in an interview. “We’ve got great partners with Nippon Steel. These investments would not have been able to happen without it.”
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Burritt said U.S. Steel on its own couldn’t afford the costly upgrades and maintenance needed at Mon Valley, which consists of three plants in separate towns south of Pittsburgh.

In early 2025, then President Biden blocked the sale to the Japanese company over potential national-security risks. President Trump resurrected the deal and approved it on the condition that Nippon Steel increased its investments in U.S. Steel’s existing plants to $11 billion.

The White House also gets a veto over “plant closings, the transfer of production out of the country and other operational changes,” which in theory should prevent the industry from getting re-hollowed out.