Category Steel Class Alloy steel Type Standard Common names Silicon-manganese steel Designations United states: uns g92540 Composition Element Weight % C 0.51-0.59 Mn 0.60-0.80 P 0.035 (max) S 0.04 (max) Si 1.20-1.60 Cr 0.60-0.80 Mechanical properties Properties Conditions T (â°c) Treatment Density (ã?1000 kg/m3) 7.7-8.03 25 Poisson's ratio 0.27-0.30 25 Elastic modulus (gpa) 190-210 25 -