Section 15 Base metals and articles of base metal 73 Articles of iron or steel 73 06 Other tubes, pipes and hollow profiles(eg.open seam...),of iron or steel, welded, nes 73 06 20 Casing and tubing of a kind used in the drilling for oil and gas 73 06 20 00 Casing and tubing of a kind used in the drilling for oil and gas Commodity Code Description 73 06 20 00 000 Casing and tubing of a kind used in the drilling for oil and gas