Industry reporting today states that the U.S. administration has added 407 more product lines of steel and aluminium derivatives to its 50% tariff list, effective as announced on August 22, 2025. The expanded list reportedly includes intermediate and finished components such as automotive exhaust parts and electrical steel used in electric-vehicle motors and transformers — goods that many automakers and suppliers import into the U.S. The coverage emphasised that the widening of levies is part of an ongoing effort to broaden the protective tariff net introduced earlier this year for primary steel and aluminium, and that affected sectors may face sharp input cost increases as a result. Trade groups and several downstream industries have warned the measures could disrupt supply chains and raise production costs for US manufacturers dependent on imported subcomponents. The article noted that regulators and customs authorities will publish detailed Harmonized System (HS) codes to operationalise the expansion and that affected importers are evaluating re-routing, sourcing, or pass-through cost strategies in response.