The issue is cost, not quality. As long as imported steel meets the minimum standards, it's perfectly usable. The American steel industry has lagged behind imported steel for decades because of high domestic production costs. That's why the auto and other manufacturing industries rely so heavily on imported steel which has increased in quality.
That doesn't address the problem of higher auto prices. It doesn't matter who they buy their steel from if the price is high from all sources. Trump's moronic economic policies are taking away the lower cost sources of raw materials and now we're beginning to see the cost associated with electing an idiot and a fraud.