• D-Diameter, Thickness, or Distance Between Parallel Faces, Plates and Bars；T-Structural Shape Flange or Leg Thickness

① Plates to 1-1/2 in. [40 mm] Thick, Shapes with Flange or Leg Thickness to 3 in. [75 mm] inclusive, Sheet Piling, Bars, Zees, and Rolled Tees: Si≤0.40% . Plates Over 1-1/2 in. [40 mm] Thick and Shapes with Flange Thickness Over 3 in. [75 mm]：Si 0.15~0.40%.
② Manganese, minimum, by heat analysis of 0.80 % (0.75 % by product analysis) shall be required for all plates over 3/8 in. [10 mm] in thickness; a minimum of 0.50 % (0.45 % by product analysis) shall be required for plates 3/8 in. [10 mm] and less in thickness, and for all other products. The manganese to carbon ratio shall not be less than 2 to 1.
③ For each reduction of 0.01 percentage point below the specified carbon maximum, an increase of 0.06 percentage point manganese above the specified maximum is permitted. up to a maximum of 1.60 %.
④ maximum phosphorus content of 0.04 % and a maximum sulfur content of 0.05 % are permitted for the following materials： Structural shapes， Sheet piling， Bars， Plates with widlhs up to and including 15 in. [380 mm].
⑤ Nb：Product analysis limits = 0.004~0.06 %.
* Round bars up to and including 11 in. [275 mm] in diameter are permitted.