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SITCSection 6
U.S. imports of ferrosilicon manganese (silicomanganese) (SITC 67152) totaled $63.6M in April 2026, traded with 11 countries.
Importers of Ferrosilicon Manganese (Silicomanganese) paid $1.2M in duties in April 2026 — an effective duty rate of 3.9% on $30.0M in dutiable value, based on actual customs collections rather than the published tariff schedule. Ferrosilicon Manganese (Silicomanganese) imports of $63.6M in April 2026 ran 79% above the year-to-date monthly average of $35.5M.
Last updated: April 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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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.
Monthly import values over time
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| GEORGIA | $16.2M | -- | -$16.2M |
| MALAYSIA | $15.9M | -- | -$15.9M |
| SOUTH AFRICA | $14.8M | -- | -$14.8M |
| MEXICO | $6.2M | -- | -$6.2M |
| NORWAY | $5.7M | -- | -$5.7M |