NEW YORK -- United States Steel on Tuesday detailed its billion-dollar multiyear growth plan with new owner Nippon Steel that includes modernizing the century-old steelmaker.

The announcement comes just five months after Nippon Steel finalized a "historic partnership" with the Pittsburgh steelmaker in a deal worth nearly $15 billion. That deal included a "golden share" provision that gave the federal government the power to appoint a board member and a say in some company decisions.

The combined company became the world's fourth-largest steelmaker, and Nippon agreed to invest $11 billion to upgrade U.S. Steel's facilities.

The company said Tuesday it will make the investments by the end of 2028. The plan targets unlocking $2.5 billion in savings from capital investments and another $500

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