… welded, riveted or similarly closed), having circular cross-sections, the external diameter of which exceeds 406.4 mm, of iron or steel. …
Explanatory notes
… preformed, unclosed, tubular shapes produced from flat‑rolled products. The tubular shapes can be produced : ‑ … or spirally in a continuous operation by means of a set of rollers, for flat‑rolled products in coils; or ‑ … in a non‑continuous operation by means of a press or rolling machine, for flat‑rolled products not in coils. In …