Tubes, seamless or welded, round or moulded, of metal, in particular steel; coated tubes; pipes and tubes of metal; tubes for hydraulic conduits; tubes for pneumatic conduits; pipes for hydraulic pipelines; pipes for pneumatic pipelines; metal tubing; ironmongery; steel pipes for hydraulic applications and pneumatic applications; tubes for cylindrical structure; all aformentioned tubes and pipes of metal or predominant of metal, in particular steel