If your manufacturing employer consumes steel and that steel is now more expensive it means less of those jobs, not more. You're only pulling money from other US citizens and companies so its not really a gain to the US overall. It increases the cost of US manufactured goods that have to buy tariff laden supplies. This ends up hurting US manufacturing exports over all. All of this assumes we actually do pay for US steel but the reality is we'll just go to the next cheapest supplier which may or may not be local.