… welded, riveted or similarly closed), having circular cross-sections, the external diameter of which exceeds 406.4 mm, …
Explanatory notes
… welded, riveted or similarly closed), having circular cross-sections, the external diameter of which exceeds 406.4 mm, … ‑ longitudinally or spirally in a continuous operation by means of a set of rollers, for flat‑rolled … filler metal by flash‑welding, by electrical resistance or induction welding, or by submerged arc welding with filler …