Pipes, tubes and industrial hoses, and fittings therefor, including valves, of metal; metal fittings for pipes, flexible hoses and pipes including hose-pipe assemblies; metal flanges and junctions for metal hoses and pipes and for pipe systems or being part of pipe systems; metal pipes for liquid and gas transfer; metal valves for controlling the flow of fluids in pipelines; metal hoses and pipes for gaseous or liquid media