The U.S. is the world’s number steel producer. Your company could use U.S. suppliers and avoid all the tariffs. That’s the point. So Trump isn’t causing your company’s problem. It is your company’s choice to continue to use foreign suppliers that is the problem.
First, no we aren't. Not even close. China produces nearly nine times as much steel as we do. Second, 'steel production' is a bit of a misnomer in this country as 2/3's of the steel in the US is not produced from ore but from scrap. In other words, we aren't making most of it from ore, we are recycling it.
Second, I am not in the purchasing department, but you better believe they take finding the cheapest supply of steel that meets our requirements very seriously. My company is less than 100 miles from the Canadian border. That is probably a factor. The fact that we require steel to meet a very specific quality standard is probably another. I know we have had some issues with steel from certain Asian countries being outside our specs.
Third, you are insane if you think putting tariffs on the vast majority of steel in the world will not impact prices domestically. Of course we could get domestic steel, but it will still be more expensive as demand will shoot up because everyone who uses foreign steel (most US manufacturing) will be facing the same issue. Eventually it may equalize but by then who knows where our economy will be.