Metal casting process with red high temperature fire in metal part factory 1. Introduction: The Purpose of Section 232 Duties On April 2, 2026, a significant regulatory shift occurred with the issuance of the Presidential Proclamation, “Strengthening Actions Taken to Adjust Imports of Aluminum, Steel, and Copper into the United States.” The importer, this isn't just another tariff—it is a specialized layer of national security regulation under Section 232 of the Trade Expansi