A slab is a semifinished product (heading 7218) that has not been brought to finished flat-rolled dimensions and surface condition; it is intended for further rolling. A plate over 10 mm thick under heading 7219 has been hot-rolled to its final thickness and width, with edges trimmed or as-rolled, and is ready for direct use or cutting to size. The distinction turns on whether the product is in a finished flat-rolled form or still requires further rolling reduction.

High-nickel stainless grades — typically those with nickel content above a defined threshold, such as certain duplex or super-austenitic alloys — are tracked separately because they serve specialized corrosion-critical markets (offshore oil and gas, pharmaceutical processing) and may be subject to distinct trade remedy proceedings. Importers of alloys with elevated nickel content should confirm whether their specific grade falls within the high-nickel line's scope using the mill test certificate.