①For each reduction of 0.01% below the specified C maximum, an increase of 0.06% Mn above the specified maximum is permitted, up to a maximum of 1.60%
②錳Mn:0.75% min by product analysis shall be required for all plates t > 10 mm; ≥ 0.50% (≥ 0.45% by product analysis) shall be required for plates t ≤ 10 mm, and for all other products. The Mn to C ratio shall not be less than 2 to 1
③硅Si:For plates t > 40 mm and shapes with flange t > 75 mm; Si ≤ 0.40% for plates t < 40 mm and shapes with flange or leg t ≤ 75 mm
④銅Cu:When specified; Product analysis: 0.18% min
⑤釩V:Product analysis: 0.005 - 0.17%
⑥鈮Nb:Product analysis: 0.004 - 0.06%
⑦釩V+鈮Nb:Product analysis: 0.01 - 0.16%