ASME SA-210 SPECIFICATION FOR SEAMLESS MEDIUM-CARBON STEEL BOILER AND SUPERHEATER TUBES Chemical Composition （max. %） Element Grade A-1 Grade C C 0.27 0.35 Mn 0.93 0.29-1.06 P 0.035 0.035 S 0.035 0.035 Si ≥0.10 0.10 For each reduction of 0.01% below the specified carbon maximum, an increase of 0.06% manganese above the specified maximum will…