美国：扩大钢铝关税清单措施于18日正式生效

Group 1 - The U.S. has officially expanded the scope of steel and aluminum tariffs, imposing a 50% tariff on hundreds of derivative products [1][5] - The expanded tariff list includes 407 types of steel and aluminum derivative products, which will incur additional tariffs based on their steel and aluminum content [3] - This move is expected to impact global trade and increase production costs for U.S. manufacturers, compounding existing pressures from tariffs [5] Group 2 - U.S. manufacturers are heavily reliant on imports from Brazil for steel, particularly semi-finished slab, due to a structural supply gap of approximately 5 million tons [7] - Cleveland-Cliffs, a major U.S. steel producer, has halted operations at three facilities and reported a loss of $470 million in Q2 2025, exploring asset sales to recover losses [7]