Section 15 Base metals and articles of base metal 72 Iron and steel 72 15 Other bars and rods of iron or non-alloy steel 72 15 50 Containing by weight 0.6 % or more of carbon, other than of circular cross-section 72 15 50 10 Containing by weight 0.6 % or more of carbon, other than of circular cross-section Commodity Code Description 72 15 50 10 00 Containing by weight 0.6 % or more of carbon, other than of circular cross-section