China established their position as a major international steel producer by dumping in order to destroy foreign competition. The United States wasn't the only country in their crosshairs. At least in theory, countries outside of China should be able to produce enough steel to supply most (if not all) of the Western world without relying on Chinese steel.
Or more to the point, the United States should be able to buy what it needs from other countries should tariffs make steel from China cost-prohibitive.
Too many manufacturers got hooked on cheap Chinese steel. Those prices were unrealistically low.