The intent of the Chinese tariffs is to get companies to buy (cheaper) American made steel, which they could do but don't because they're looking at the profit margin not sustainability. It's obvious the Cruze is not selling well and that's not because the steel prices are too high. The plant closed because its product is not profitable.
That being said, tariffs are going to raise costs no doubt. What's the alternative? Let countries like China produce cheap goods with slave labor then dump them on our shores? Idk I'm not a PhD economist just a curious observer.
The reason China can manufacture steel at such low prices is because political prisoners don't get paid a wage. They work for free. And, if there are no tariffs on the raw goods just the finished product in this case steel, then you import the raw materials and manufacture the steel here. At that point the ONLY reason the costs would be higher are labor costs, which is always going to be the case with products manufactured in the US because of unions and other considerations. There aren't considerations for human capital in countries like China because they have no rights over there.
As for cheap goods manufactured in China, the reason they're manufactured in China in the first place and imported here where they end up in Walmart, Target and every other retail outlet is because they're able to be MANUFACTURED at such a lower cost because of the slave labor. They don't have to worry over there about lunatic politicians demanding a $15 minimum wage.