美国宣布扩大对钢铁和铝进口征收50%关税的范围

Group 1 - The core viewpoint of the article is that the Trump administration has expanded tariffs on steel and aluminum imports to include hundreds of derivative products, with a 50% tariff rate applied to these items [1] - On August 15, the U.S. Department of Commerce announced the addition of 407 product codes to the U.S. Harmonized Tariff Schedule, which will incur additional tariffs due to their steel and aluminum content [1] - The expanded tariff list will officially take effect on August 18, following a previous announcement on June 3 to raise tariffs on imported steel and aluminum and their derivatives from 25% to 50% [1]