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HSChapter 28
U.S. exports of carbides of boron, chromium, tungsten, and other metals (nesoi) (HS 284990) totaled $16.1M in July 2026.
Importers of Carbides of Boron, Chromium, Tungsten, and Other Metals (NESOI) paid $2.1M in duties in July 2026 — an effective duty rate of 23% on $9.1M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataTungsten carbide, boron carbide, and chromium carbide are the commercially dominant materials under this heading, serving as essential inputs for cutting inserts, wear-resistant coatings, and hard-metal tooling across aerospace, mining, and metalworking industries. The US schedule breaks out boron carbide (2849901000), chromium carbide (2849902000), and tungsten carbide (2849903000) as distinct 10-digit lines, with residual carbides captured under 2849905000 and 2849906000. China is the leading supplier, with Austria and Canada also significant sources — Austria in particular is a recognized center of cemented carbide manufacturing. Tungsten carbide lines may attract Section 301 scrutiny when sourced from China, and importers should confirm classification carefully since mixed carbide powders can straddle multiple lines.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
74 shipments/mo
Classification depends on whether the product meets the definition of a chemically defined compound or a mixture. Pure tungsten carbide (WC) falls under 2849903000, but cemented carbide powders containing cobalt binders may be classified differently — potentially under Chapter 28 or as a metal powder under Chapter 81. A binding ruling from CBP is advisable for mixed-composition materials.
Importers must provide a commercial invoice, packing list, and a certificate of origin or manufacturer's declaration. For USMCA-adjacent supply chains involving Canadian re-export of Austrian carbide, substantial transformation rules apply and the actual country of origin must be correctly declared to avoid misclassification.
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Subheading 1 of 3 in heading 2849
Subheading 284990 · $12.4M of $31.2M
ImportsExports
Imports
$12.4MYoY · Pro
Exports
$16.1MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2849903000 | Carbides, Chem Defined/not, Of Tungsten | $14.8M | 2.87% | 37.88% | $425K |
| 2849905000 | Carbides, Whether or not Chemically Defined, NESOI | $1.8M | 41.30% | 115.39% | $734K |
| 2849901000 | Carbides, Chem Defined/not, Of Boron | $1.3M | 5.10% | 37.22% | $65K |
| 2849902000 | Carbides, Chem Defined/not, Of Chromium | $481K | 30.66% | 90.42% | $148K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2849903000 | Carbides, Chem Defined/not, Of Tungsten | $9.2M |
| 2849906000 | Carbides, Excluding of Boron or of Tungsten | $1.6M |
| 2849901000 | Carbides, Chem Defined/not, Of Boron | $249K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Exports · July 2026
destination
Canada and Germany together take 54% of it.
customs district
origin
entry
rate provision · imports
29.6% enters free of duty; the effective duty rate is 16.56%.