Also in the US, we've got Steel Dynamics (producing 75% as much as US Steel), Cleveland-Cliffs (approximately tied with US Steel), and Nucor (about 157% as much). That's not the whole story, of course -- Nucor primarily recycles scrap steel, for example, as opposed to smelting ore -- but I'm not really seeing a crisis anywhere on the horizon here. (My opinion in this paragraph is less confident than the first, so I'm open to correction from someone who knows more about the steel industry.)