7306: Tubes, pipes and hollow profiles of iron or steel, nes

730610: Pipe, line, i or s, weldd, rivetd or sim closd, nes, for oil or gas p 730620: Casing/tubing, i or s, welded, riveted or sim clsd, nes, for oil/gas 730630: Tubes, pipe & hollow profiles, iron or nas, welded, of circ cross sec 730640: Tube, pipe & hollow profile, stainless steel, weldd, of circ cross se 730650: Tubes, pipe & hollow profiles, al/s, (o/t stain) wld, of circ cross s 730660: Tubes, pipe & hollow profiles, i/s, welded, of non circ cross sect, n 730690: Tubes, pipe & hollow profiles, iron or steel, welded, nes 7306: Tubes, pipes and hollow profiles of iron or steel, nes