ASTM A109 Temper 1 Category Steel Class Carbon steel Composition Element Weight % C 0.25 Mn 0.60 P 0.035 S 0.04 Si 0.10 (max) Cu 0.20 (min) Ti 0.05 (min) Mechanical Properties Properties Conditions T (°C) Treatment Density (×1000 kg/m3) 7.7–8.03 25 Poisson’s Ratio 0.27-0.30 25 Elastic Modulus (GPa) 190–210 25