Section 15 Base metals and articles of base metal 73 Articles of iron or steel 73 01 Sheet piling of iron or steel, whether or not drilled, punched or made from assembled elements; welded angles, shapes and sections, of iron or steel. 73 01 20 Angles, shapes and sections 73 01 20 00 Angles, shapes and sections Commodity Code Description 73 01 20 00 000 Angles, shapes and sections