Common metals and their alloys; goods of metal included in this class, particularly, metal tubes provided with a wear protection layer, connectors and branching tubes of metal, as well as metal ducts provided with a wear protection layer, all for conveying solids, liquids and gases for natural gas pipelines and tubes

Tubes and Nozzles Made Wholly or Principally of Refractory Material for Conducting Flow or Discharge of Molten Metal, for Use in Metallurgy and Foundry Processes