Casing

HS code 7304, 7305 and 7306 are used for tubes and pipes made of iron or steel. HS code 7304 is used for casing, tubing and drill pipe of a kind used in drilling for oil or gas. HS code 7305 is used for tubes and pipes having circular cross-sections and an external diameter of 406.4 mm, of flat-rolled products of iron or steel. HS code 7306 is used for tubes, pipes and hollow profiles, welded, of circular cross-section, of iron or non-alloy steel (excluding products having internal and external circular cross-sections and an external diameter of 406.4 mm, or line pipe of a kind used for oil or gas pipelines, or casing and tubing of a kind used in drilling for oil or gas)