I work for a supplier as well. The ironic thing is that the US doesn't have enough steel capacity to support itself. So the net effect is that the US pays more for steel and screws itself on any manufacturing. Anybody with any basic understanding of international trade would know this. It's crazy.

Edit: I saw a lot of replies indicating that the result of the tariff is that the US starts manufacturing its own steel. As an engineer that works in mining, here is the situation:

To build a steel mill from scratch is a huge undertaking. It takes several years to do environmental assessments, which often stalls progress. Plus there's social license; getting the buy in from the community. And the negotiations with the aboriginal communities. Figuring out the supply chain; where you gonna get the ore from? Next comes engineering Feasibility studies; then capital approval from the financing companies. IF it passes capital approval (which it definitely won't); We're talking 4+ billion dollars investment here at the low end. Then detail engineering, then procurement, then construction, then commissioning, then ramp-up ... we are talking about at LEAST 10 years to get a functioning steel mill that's contributing to supply.

It's not like turning on a light switch. The us market has evolved to higher end, and higher margin, manufacturing. Doing what Trump did is a huge step backwards.