Steel Mills
USS Clairton Coke Works reports explosion
Written by Kristen DiLandro
August 11, 2025
U.S. Steel’s Clairton Coke Works facility experienced a powerful blast at 10:51 a.m. local time on Monday.
Updates about the incident are ongoing, but first reports suggest the explosion sparked a destructive fire at the site.
The Allegheny County Police confirmed the incident is ongoing.
Clairton Coke Works is located outside of Pittsburgh in the Mon Valley region and is the largest coking facility in North America. Its annual capacity totals 4.7 million short tons (st). The facility was the first coke facility in the region when it was opened by U.S. Steel in 1916.
The Clairton plant is part of the larger U.S. Steel Mon Valley Works complex in Pennsylvania. The facilities at the complex also include Edgar Thomson plant in Braddock, Irvin plant in West Mifflin, and Fairless plant in Fairless Hills.
Coke is made from coal and is used as an input in the blast furnace steelmaking process. USS produces coke at its Gary Works integrated mill in Gary, Ind.
U.S. Steel did not return a request for comment from SMU by time of publication.
Kristen DiLandro
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