ASTM A109 Temper 4 Category Steel Class Carbon steel Composition Element Weight % C 0.15 Mn 0.60 P 0.035 S 0.04 Si 0.90 (max) Cr 0.8 (max) Cu 0.20min Zr 0.05min Ti 0.1 (max) B 0.0025 (max) Nb 0.005-0.06 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