Parts of machines, namely, tubes, profiles, rolls, pipes, spindles, axles, beams, girders, levers, rods, blades, shafts; pressure tanks as parts of machines; blades, shafts and other structural parts for wind power installations; pipes, risers, hollow shafts and drilling rods for onshore and offshore drilling installations; tanks, namely gas pressure tanks and transmission shafts as parts for air planes, helicopters and boats