A giant ladle glows red after pouring molten iron in to a vessel inside the basic oxygen furnace as part of the processes of making steel at the U.S. Steel Granite City Works facility Thursday, June 28, 2018, in Granite City, Ill. Associated Press File Photo

HARRISBURG — U.S. Steel will stop processing steel slabs at its Granite City Works plant in Illinois, three months after Nippon Steel sealed a deal with President Donald Trump to buy the iconic American steelmaker by giving the government a say over decisions that affect domestic steel production.

U.S. Steel will cut off production at the plant, likely in November, but it won’t lay off any of the roughly 800 workers there or reduce their pay, it said. Workers will maintain the plant so that it is operational in case anything changes, U.S. Steel said.

They’ll keep their jobs at least until 2027, as a result of a national security agreement between Trump and Nippon Steel that allowed its buyout of U.S. Steel to go forward.

In a statement, the Pittsburgh steelmaker said Tuesday that it will “optimize” its operations by focusing on processing raw steel at its Mon Valley Works facilities in Pennsylvania and Gary Works in Indiana.

Granite City Works makes rolls of sheet steel for the construction, container, pipe and automotive industries.

The plant is located in southern Illinois, just outside St. Louis. However, in 2023, U.S. Steel stopped producing raw steel there when it idled the last operating blast furnace at Granite City. It idled the other blast furnace there in 2019.

Nippon Steel in June finalized its nearly $15 billion takeover of U.S. Steel, ending a long and politically fraught process a year-and-a-half after the Japanese company first proposed the buyout.

The pursuit by Nippon Steel for the Pittsburgh-based company was buffeted by national security concerns and presidential politics in a premier battleground state, dragging out the transaction for more than a year after U.S. Steel shareholders approved it.

In the end, Trump changed his stance on invoking national security grounds to block it.

To sweeten the deal, Nippon Steel upped its guarantees of investment into U.S. Steel facilities and added a so-called “golden share” provision that gives the federal government the power to appoint a board member and a say in company decisions that affect domestic steel production and competition with overseas producers.

The protections last until 2035 for U.S. Steel facilities, except for Granite City. Those protections last until 2027.