Canada, not China, is being penalized the most by the tariffs on metals. Also Canada is 1/10 the size of the USA.

Here's what happened: Trump is hitting the E.U., Canada and Mexico with a 25 percent tariff on steel imports and a 10 percent tariff on aluminum sent to the United States starting Friday. While China is also subject to the tariffs, the E.U. and Canada send far more metal to the United States, so the penalties will have a much larger impact on them.

"We don't buy steel and aluminum from China. We buy it from our allies," said economist Chad Bown, a senior fellow at the Peterson Institute for International Economics.

Take a look at total U.S. steel and aluminum imports last year from various countries to understand who's affected most (data compiled by PIIE):
Canada: $12.4 billion
European Union: $7.7 billion
Mexico: $2.9 billion
China: $2.9 billion
Japan: $2 billion