U.S. Steel Explosion Presents Challenge to Nippon’s Investment Plans

Nippon Steel promised to spend $14 billion to keep U.S. Steel’s aging plants humming for decades. Crews are continuing to clean up and restore operations at the Clairton, Pa., plant where an explosion Monday killed two workers and injured 10 others. U.S. Steel officials said the blast reduced the company’s ability to produce coke—a key steelmaking input—at its Mon Valley Works complex.

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