Tubes, pipes and hollow profiles, seamless, of circular crosssection, of alloy steel other than stainless, colddrawn or coldrolled "coldreduced", straight and of uniform wallthickness, containing by weight > 0,9% but < 1,15% carbon and > 0,5% but < 2% chromium, whether or not containing by weight < 0,5% molybdenum (excl. tubes, pipes and hollow profiles of subheadings 7304 19 to 7304 29)