Tubes, pipes and hollow profiles, welded, having a circular cross-section, of iron or non-alloy steel (excl. of cast iron, products having internal and external circular cross-sections and an external diameter of > 406,4 mm, or line pipe of a kind used fo or gas pipelines or casing and tubing of a kind used in drilling for oil or gas) Excl. Excl. Excl. Excl. Excl. Excl.