7403.29.01 - Other copper alloys

This HTS category, "Other copper alloys," encompasses unwrought refined copper alloys that do not fall under more specific subheadings within heading 7403. It serves as a residual category for copper alloys where the primary alloying elements are not explicitly listed in preceding subheadings. These alloys are typically in an unwrought state, meaning they have not undergone significant fabrication beyond initial melting and casting into basic forms such as ingots, pigs, or cakes.

Crucially, this category distinguishes itself from its siblings by excluding copper alloys where zinc (brass) or tin (bronze) are the dominant alloying elements. While brass and bronze are common copper alloys, this classification is intended for other combinations of metals with copper as the principal component. The presence of other metals in varying proportions will determine if an alloy falls into this "other" category rather than a specifically enumerated one.

Within this broad classification, further subdivisions exist to address specific, commonly encountered copper alloys. The subcategory "Copper-nickel base alloys (cupro-nickel) or copper-nickel-zinc base alloys (nickel silver)" accounts for alloys where nickel is a significant alloying element, often used for their corrosion resistance and aesthetic properties. The "Other" subcategory then captures any remaining unwrought copper alloys not otherwise specified, reflecting the diverse metallurgical landscape of copper-based materials.