The Hamilton plant has not produced steel since 2011, but its coke ovens and cold rolling finishing works remain in operation.

The company employs about 750 people in the Hamilton plant and 1,400 in Nanticoke, Ontario[3] at its greenfield facility Stelco Lake Erie Works.

[7] Several union drives at the plant were unsuccessful until the founding strike of Local 1005 of the United Steelworkers of America in 1946.

[8] Several non-core operations were divested, including Stelwire, Norambar (formerly Stelco McMaster Works) and Welland Pipe.

[9] Market conditions and declining customer orders prompted U.S. Steel to shut down the Hamilton Works on October 1, 2010.

[20] In January 2021 Stelco added pig iron production capability to its Lake Erie blast furnace.

[22] In July 2024, it was publicly announced that Cleveland-Cliffs, an American steel manufacturer, was acquiring Stelco for approximately US$2.5 billion.

For example, in 1989, Stelco and Dofasco were listed among the "dirty dozen" polluters in Ontario: "For many years Steeltown's two giants pumped liquid discharges that contained cyanide, phosphorus, ammonia, solvents and phenols straight into Hamilton Harbour.

But both firms have been cleaning up to meet the terms of a pollution control order imposed on them by Queen's Park [and] the harbour is getting cleaner and supports 58 known species of fish.