Please see official Department of Commerce (DOC) documents regarding the steel/aluminum tariffs. The first link has all the fact sheets. The rest of the links provide supporting documentation. If you have any additional questions concerning this matter, please call the DOC Office of Public Affairs –
THE EFFECT OF IMPORTS OF STEEL ON THE NATIONAL SECURITY AN INVESTIGATION CONDUCTED UNDER SECTION 232 OF THETRADE EXPANSION ACT OF 1962, AS AMENDED
“Global Steel Trade Monitor, Steel Imports Report: United States” Dec 2017.