U.S. imports of Ferrosilicon Manganese (Silicomanganese) (SITC 67152) totaled $41.4M in August 2026, imported from 15 countries.
Importers of Ferrosilicon Manganese (Silicomanganese) paid $1.4M in duties in August 2026, an average duty rate of 3.82% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Ferrosilicon Manganese (Silicomanganese) imports of $41.4M in August 2026 ran 17% above the year-to-date monthly average of $35.5M.
Last updated: August 2026 dataSilicomanganese — the common trade name for ferrosilicon manganese — combines manganese and silicon in a single alloy addition, offering steelmakers a cost-efficient way to simultaneously deoxidize and alloy carbon and structural steel grades. Its dual-element chemistry distinguishes it from straight ferromanganese or ferrosilicon additions and places it in its own classification heading. Silicomanganese is widely traded in bulk and is a key input for long-product steel mills; procurement teams should monitor antidumping order activity, which has historically targeted this product from several major producing countries.
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50 import shipments a month
Silicomanganese delivers both manganese and silicon in a single addition, reducing the number of alloy charges per heat and lowering per-unit alloy cost compared to purchasing the two ferroalloys separately. The combined addition also produces a lower-melting-point slag that can improve recovery rates in the ladle. The trade-off is less flexibility to adjust the Mn:Si ratio independently, which is why some specialty steel producers still prefer separate additions.
Yes, antidumping and countervailing duty orders on silicomanganese from specific countries have been in effect at various times. Importers should query the Commerce Department's Antidumping and Countervailing Duty (AD/CVD) order database and review any active scope rulings before contracting, as the scope can turn on manganese and silicon content thresholds that overlap with adjacent ferroalloy classifications.
Basic heading 145 of 766 in section 6
Basic heading 67152 · $41.4M of $27.0B
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Imports · August 2026
origin
Georgia and India together supply 64% of it.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$41.4MYoY · free account
Exports
$1.0MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $405.3M of Ferrosilicon Manganese (Silicomanganese) and exported $24.3M.
Through August 2026. Source: U.S. Census Bureau.