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SITCSection 7
U.S. imports of nonelectric furnaces & ovens for roasting, melting or heat treatment of ores or metals (SITC 74136) totaled $2.4M in April 2026, traded with 20 countries.
Importers of Nonelectric Furnaces & Ovens for Roasting, Melting or Heat Treatment of Ores or Metals paid $131K in duties in April 2026 — an effective duty rate of 6.4% on $2.0M in dutiable value, based on actual customs collections rather than the published tariff schedule. Nonelectric Furnaces & Ovens for Roasting, Melting or Heat Treatment of Ores or Metals imports of $2.4M in April 2026 ran 49% below the year-to-date monthly average of $4.6M.
Last updated: April 2026 dataRotary kilns, reverberatory furnaces, blast furnaces, and other fuel-fired thermal units used to roast, calcine, smelt, or otherwise heat-treat metallic ores, pyrites, and metals are the primary equipment in this heading, which sits at the heart of primary metals production. These large-scale, capital-intensive units are central to copper, zinc, lead, and iron smelting operations, and their trade is closely tied to greenfield mining and metallurgical plant construction cycles globally. Because these are nonelectric units, the heating source is combustion-based—natural gas, oil, or solid fuel—distinguishing them from the electric furnace headings. Import volumes tend to be low but high in unit value, and specialized freight and installation logistics are standard considerations.
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The critical factor is the intended material being processed: this heading applies specifically to furnaces designed for the heat treatment of ores, pyrites, or metals—not for ceramics, glass, or food products. Technical documentation confirming the furnace's design parameters (temperature range, atmosphere control, feed material) and the manufacturer's stated application are the primary classification evidence. A furnace capable of processing both metals and other materials may require a principal-use determination.
Due to their enormous size, blast furnaces are almost always imported in prefabricated sections or as components and assembled on-site. This raises classification questions about whether individual sections are classified as parts of the furnace or as structural steel or refractory products. The classification of each section depends on its degree of manufacture and whether it is identifiable as a furnace component at the time of importation; a binding ruling from CBP is advisable for large modular furnace projects.
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Monthly import values over time