A lot of that steel we made in the 60s and 70s was exported. Now we are the world's sixteenth largest steel exporter.
Is that because eeeevil globalists have been sabotaging our steel industry? Only in the fevered brains of conspiracy theorists.
What actually happened are two things. First, the rest of the world got smart and got productive. Second, our country decided to tax and regulate our industries to within an inch of bankruptcy.
We can fix the second, but as to the first, we pretty much have to suck it up if we want to sell competitively priced products.
I think the world is begging for high quality US steel products. So exports would be the next hurdle. Having the extra capacity is a matter of national security also.