特朗普50%钢铝关税即将生效，专家提醒：未来232和301调查更值得警惕

Core Viewpoint - The Trump administration has announced an increase in tariffs on steel and aluminum imports from 25% to 50%, effective June 4, 2025, citing national security as the primary reason for this adjustment [1][3]. Group 1: Tariff Adjustments - The increase in tariffs aims to provide greater support to the steel and aluminum industries and reduce the threat these imports pose to national security [3]. - An exception is made for imports from the UK, which will maintain the 25% tariff, allowing for negotiations on new tariffs or quotas before the July 9 deadline [3][4]. Group 2: Ongoing Investigations - Multiple Section 232 investigations are still ongoing, and the outcomes could lead to similar tariff adjustments for other industries, making them a point of concern for foreign trade enterprises [1][5]. - Industries currently under Section 232 investigations include semiconductors, pharmaceuticals, wood, copper, heavy trucks, and critical minerals [5]. Group 3: Economic Implications - The imposition of tariffs is expected to increase production costs for U.S. manufacturers reliant on imported intermediate goods, potentially harming their competitiveness in international markets [6]. - The OECD has revised its economic growth forecast for the U.S. down from 2.2% to 1.6% due to the impact of Trump's tariff policies [6].