api36ASTM A36 Steel. ASTM A36 steel is one of the most widely used carbon structural steels, although the carbon content of A36 material is maximumAPI CASING TABLE SPECIFICATION Size Wei ght ID Drift Capacity Inches mm lbft Inches mm Inches mm bbl100ft 7 34 196.85 46.10 6.560 166.62 6.500 165.10 4.18