The executive suite at U.S. Steel (NYSE:X) will look a bit different in the very near future. The company announced that it has promoted current President and COO Mario Longhi to be its next chief executive, effective Sept. 1. Longhi replaces John Surma in that position. Surma will remain chairman of the company's board until Dec. 31, when he will retire from the metallurgy giant.

In addition, U.S. Steel has tapped David Burritt to be executive vice president and CFO. He replaces Gretchen Haggerty, who is to retire on Aug. 31.

Lastly, the company announced that James Garraux, its general counsel and senior vice president, corporate affairs, has served notice that he will retire by the end of this year.

Longhi has been with U.S. Steel since the summer of 2012, when he was brought on to be its COO. This past June, he was named president.

Buritt was a longtime executive at Caterpillar, where he most recently served as CFO and vice president of global finance and strategic services until June 2010.

Garraux has been with US Steel for 34 years, working in a variety of positions.