The Combined Nomenclature (CN), v1:2020
7310 21 99: Cans of iron or steel, of a capacity of < 50 l, which are to be closed by soldering or crimping, of a wall thickness of >= 0,5 mm (excl. cans for compressed or liquefied gas, and cans of a kind used for preserving food and drink)
https://www.dst.dk/en/Statistik/dokumentation/nomenklaturer/kn?id=82f0fee5-2769-43bc-83fc-79117ee135ae