7210.90 - Other:

This category, HTS 7210.90, encompasses flat-rolled products of iron or non-alloy steel, with a width of 600 mm or more, that are clad, plated, or coated, but do not fall into the more specific categories defined by the type of coating. These are essentially steel sheets or coils that have undergone a surface treatment beyond simple rolling, but where the coating method or material is not explicitly enumerated in preceding subheadings.

It differentiates itself from sibling categories such as those plated or coated with tin (7210.11), lead (7210.20), zinc (electrolytically in 7210.30, or otherwise in 7210.41), or chromium (7210.50). Where those subheadings specify the exact plating or coating material, HTS 7210.90 serves as a residual category for all other such treated flat-rolled products not otherwise classified.

Within this "Other" designation, further subdivisions exist to refine classification. The subcategory 7210.90.10.00 specifically addresses products that are clad, meaning they are metallurgically bonded to another metal. The subsequent "Other" subdivision (7210.90.90.00) will then capture any remaining flat-rolled products of iron or non-alloy steel that are plated or coated with materials not specified elsewhere in this heading, ensuring comprehensive coverage for a wide range of surface treatments.