U. S. Steel Canada Withdraws From Wabush Mines Sales Negotiations

HAMILTON, Ontario, March 4 /PRNewswire/ -- U. S. Steel Canada Inc., a foreign subsidiary of United States Steel Corporation (NYSE: X), announced today that it has withdrawn from negotiations to sell its 44.6 percent interest in the Wabush Mines Joint Venture to ArcelorMittal Dofasco Inc.

Cleveland-Cliffs Inc holds a 26.8 percent interest and Dofasco holds a 28.6 percent interest in the Wabush Mines Joint Venture.

For more information about U. S. Steel, visit www.ussteel.com.

SOURCE U. S. Steel Canada Inc.

-0-            03/04/2008

/CONTACT: John Armstrong, +1-412-433-6792; Erin DiPietro, +1-412-433-6845, both for U. S. Steel Canada Inc./
/Company News On-Call: http://www.prnewswire.com/comp/929150.html/
/Web site: http://www.ussteel.com /