United States Steel Corp. (U.S. Steel), Pittsburgh, (NYSE: X) plans to acquire Lone Star Technologies Inc., Dallas, (NYSE: LSS) for $67.50 per share in a total deal valued at approximately US$2.1 billion in cash. Lone Star manufactures welded oilfield tubular goods. Pro forma, U. S. Steel will be North America's largest tubular producer and will have annual tubular manufacturing capability of approximately 2.8 million tons.