Structures of iron or steel and parts thereof; plates, rods, angles, shapes, sections, tubes and the like, prepared for use in structures

730810 Iron or steel; structures and parts thereof, bridges and bridge-sections 730820 Iron or steel; structures and parts thereof, towers and lattice masts 730830 Iron or steel; structures and parts thereof, doors, windows and their frames and thresholds for doors 730840 Iron or steel; structures and parts thereof, props and similar equipment for scaffolding, shuttering or pit-propping 730890 Iron or steel; structures and parts thereof, n.e.c. in heading 7308