Tin-free steel uses a chromium/chromium-oxide coating instead of tin, placing it under HTS 7210.50 rather than 7210.11 or 7210.12. The coating distinction is the classification driver. Commercially, TFS offers better lacquer adhesion and is often used for can ends and closures where direct food contact with the coating is limited, while tinplate remains preferred for can bodies requiring solderability.

The narrower width band in 7210500020 reflects a specific tariff line created to capture a commercially distinct width range — likely corresponding to standard coil widths used in particular packaging applications. Material outside that range but still within the heading falls into the NESOI line 7210500090. Importers should confirm the actual coil or sheet width on mill documentation to select the correct 10-digit line.