HOOGOVENS STAAL BV (now Corus Staal BV) and Hoogovens Steel USA, Inc., Plaintiffs-Appellants, v. UNITED STATES, Defendant-Appellee, v. Bethlehem Steel Corporation, Inland Steel Industries, Inc. (now Ispat Inland Inc.), LTV Steel Company, Inc., National Steel Corporation, and U.S. Steel Group, a unit of USX Corporation, Defendants-Cross Appellants, and AK Steel Corporation, Defendant