Material Properties Malleable Cast Iron Astm Class 220 admin May 20, 2016 Material Properties for Malleable Cast Iron Astm Class 220 Physical specifications of materials. Materials Malleable Cast Iron Description Astm Class 220 Density g/cc 7.15 lb/in^3 0.258 Hardness Brinell unless specified 173 Tensile Strength ultimate Mpa 414 Ksi 60.03 Yield Strength MPa 276 Ksi 40.02 Modulus of Elasticity Gpa 10^6 Psi Poisson’s Ratio 0.29 %Elongation at break 110 %Reduction of area Izod Impact J Ft-lb Fracture Toughness Mpa(m)^0.5 Ksi(in)^0.5 Thermal conductivity W/m-K 40 Btu/ft-h-F 23.12138728 Specific Heat Cpacity J/g-K Btu/lb-F Coefficient of thermal expansion 1E-6/K 12 1E-6/F 6.676691724 Electrical Resistivity Ohm-cm 0.000034