The Trump administration is adjusting the method for calculating tariffs on imports of steel, aluminum, copper, and their derivative products under Section 232 of the Trade Expansion Act of 1962. This adjustment stems from a document signed by U.S. President Donald Trump on Thursday.proclamation。

Under the new rules, which take effect on April 6, goods made almost entirely of aluminum, steel, or copper, including steel coils and aluminum plates, will be subject to a 50% tariff based on their value.

However, according to afact sheetreleased by the White House, derivative products that are "substantially made of" steel, aluminum, or copper will face a 25% tariff. According to alistprovided by the White House, such products include semi-trailers and trailers.

Trump made clear that steel and aluminum products from the United Kingdom will be subject to lower tariff rates. Such goods made almost entirely of these metals will face a 25% tariff, while derivative products will face a 15% rate. Trump also stated that the new rules do not change or replace previous agreements with trading partners such as theEuropean Union、JapanandSouth Korea.

Meanwhile, according to the White House fact sheet, the administration has also set a 15% tariff rate for "certain metal-insensitive industrial equipment and power grid equipment," and a 10% tariff on imported goods made entirely from U.S.-produced steel, aluminum, or copper. The equipment tariff rates will remain in effect until 2027.

Finally, the proclamation states that goods with a steel, aluminum, or copper content of no more than 15% will no longer be subject to Section 232 tariffs.

Trump firstintroduced new tariffs on steel and aluminum productsmore than a year ago, and laterraised them to 50%. At the same time, copper imports have beenfacing a 50% tariff。

since last August. For steel and aluminum tariffs, Trump laterexpanded the scope of covered goodsto include locomotives, motorcycles, truck trailers, and certain auto parts, as well as numerous household appliances such as refrigerators, dishwashers, stoves, ovens, washing machines, and microwaves.

As part of Thursday's proclamation, Trump terminated the process established in previous executive orders for bringing additional derivative products under the metal tariffs. Cabinet officials will instead conduct rolling assessments of whether additional derivative goods should be included in the tariff coverage.

In addition to steel, aluminum, and copper, Trump has also imposed tariffs under Section 232 on other goods such asautomobiles and parts、furniture、heavy trucks and buses. His administration is also currently conducting Section 232 investigations into multiple industries, includingcommercial aircraft and jet engines、robots and industrial equipmentandmedical devices.