Other angles, shapes and sections, not further worked than

72.16 Angles, shapes and sections of iron or non-alloy steel (+). 7216.10 - U, I or H sections, not further worked than hot-rolled, hot-drawn or extruded, of a height of less than 80 mm - L or T sections, not further worked than hot-rolled, hot-drawn or extruded, of a height of less than 80 mm : 7216.21 - - L sections 7216.22 - - T sections - U I or H sections, not further worked than hot-rolled, hot-drawn or extruded of a height of 80 mm or more : - - U sections 7216.32 - - I sections 7216.33 - - H sections 7216.40 - L or T sections, not M e r worked than hot-rolled, hot-drawnor extruded, of 7216.31 a height of 80 mm or more 7216.50 - Other angles, sha es B hot-drawn or extru ed and sections, not further worked than hot-rolled, - Angles, shapes and sections, not further worked than cold-formed or coldfimshed : - - Obtained from flat-rolled products 7216.69 - - Other 7216.61 - Other : 7216.91 - - Cold-formed or cold-finished from flat-rolled products 7216.99 - - Other Angles, shapes and sections are defined in Note 1 (n) to this Chapter. The sections most commonly falling in this heading are H, I, T, capital omega, Z and U Fluding channels), obtuse, acute and r i p (L) angles. The corners may be square or rounded, e limbs e ual or unequal, and the e ges may or may not be " bulbed' (bulb angles or shipbuilding earns). % Angles, shapes and sections are irsually produced by hot-rolling, hot-drawing, hot-extrusion or hot-forg~ngor forging blooms or billets. The heading includes goods which have been cold-formed or cold-finished (by cold-drawing, etc.) and also covers angles, shapes and sections made by forming on a roll e machine or by forming sheets, plates or strip on a press. So-called ' ribbed sheets and p ates "having an angular profile are aIso classified here. 'T The products of this heading may have been subjected to twistin or to surface treatment such as coating, plating Genera Explanatory Note to this Cha ter, provided they articles or of products falling in other eadings. f as drilling, punchin or see Part IV (C) o the assume the character of P f~ The heavier an les, shapes and sections (e-g., irders, beams, pillars and joists) are used in the construction o bridges, buildings, ships, etc.; ighter products are used in the manufacture of agricultural implements, machinery, automobiles, fences, h i t u r e , sliding door or curtain tracks, umbrella ribs and numerous other articles. ? The heading does not cover : (a) Welded angles, shapes and sections, and sheet piling (heading 73.01), and railway or tramway track construction material (heading 73.02). @) Articles prepared for use in structures (heading 73.08).