Precision tubes and pipes, of circular cross-section, of non-alloy steel, cold formed and welded or cold formed and cold drawn or cold rolled after welding, of an external diameter ? 406,4 mm and a wall thickness > 2 mm
Cevi in votli profili, varjeni, kovičeni ali z odprtimi šivi (razen iz nerjavnega jekla), zunanjega premera > 406,4 mm, s krožnim prečnim prerezom, debeline > 2mm