Wrought Cobalt and Cobalt Articles

Classification follows the GRI hierarchy: if the article is a finished part for a specific machine or tool (e.g., a turbine blade or drill bit), it may classify under the chapter governing that end product rather than under Chapter 81. Cobalt articles under 810590 are residual — they apply when no more specific heading covers the finished article. A binding ruling request to CBP is advisable for high-value components where the classification is genuinely ambiguous.

Wrought cobalt has been mechanically worked after solidification — rolled, forged, extruded, or drawn — altering its internal grain structure. Castings that are simply poured into a mold and not subsequently mechanically worked remain 'unwrought' and would classify under 810520. The processing route documented in the manufacturer's production records is the key evidence for making this distinction.