Hello, the census bureau's Foreign Trade Statistics website gives info on steel imports.
You can get summary statistics for all foreign imports and exports here as a part of the Statistical Abstract of the United States. For more detailed data, you can use the database STAT USA that is available through the Pima County Public Library. I checked the catalog and apparently there is a terminal in the main library near the 3rd floor reference desk which provides log-in access. A reference librarian there could help you pull out the specific information on the steel industry and also help you pull out data for the whole Latin American region.