US President Trump signed a proclamation on Monday amending his Section 232 national security tariffs on certain aluminum, steel, and copper imports. 

Under the new order, mobile industrial equipment such as bulldozers and forklifts imported from trade deal countries will be subject to a 15% tariff, while foreign companies can qualify for a reduced 10% tariff if their capital equipment is composed of at least 85% US-produced steel or aluminum by weight. 

The proclamation also introduces 25% duties on two newly added categories of derivative import products, steel racks and aluminum lithographic plates. 

Additionally, the proclamation lowers tariffs on some existing steel and aluminum derivative products, including certain agricultural machinery and residential heating, air conditioning, and ventilation equipment, reducing the rate to 15% from the previous 25%.

These changes will take effect for goods imported or withdrawn from bonded warehouses after 12:01 a.m. EST on June 8. 

The adjustments are set to remain in place through December 31, 2027, with the stated goal of encouraging near-term investments to rebuild the nation's industrial base.