<Li> Stelco (acquired by U.S. Steel in 2007) </Li> <Li> Thyssen (merged with Krupp to form ThyssenKrupp in 1999) </Li> <Li> Weirton Steel (acquired by ISG, which merged with Mittal, now ArcelorMittal) </Li> <Li> Wuhan Iron and Steel Corporation (merged with Baosteel forming China Baowu Steel Group) </Li>

Who makes the highest quality steel in the world