Grade 20 Cast Iron vs. Ductile Cast Iron
Both grade 20 cast iron and ductile cast iron are iron alloys. They have a very high 98% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is grade 20 cast iron and the bottom bar is ductile cast iron.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 160 | |
| 160 to 310 |
| Elastic (Young's, Tensile) Modulus, GPa | 180 | |
| 170 to 180 |
| Elongation at Break, % | 9.6 | |
| 2.1 to 20 |
| Fracture Toughness, MPa-m1/2 | 10 | |
| 14 to 30 |
| Poisson's Ratio | 0.29 | |
| 0.28 to 0.31 |
| Shear Modulus, GPa | 69 | |
| 64 to 70 |
| Shear Strength, MPa | 180 | |
| 420 to 800 |
| Tensile Strength: Ultimate (UTS), MPa | 160 | |
| 460 to 920 |
| Tensile Strength: Yield (Proof), MPa | 98 | |
| 310 to 670 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 270 |
| Melting Completion (Liquidus), °C | 1380 | |
| 1160 |
| Melting Onset (Solidus), °C | 1180 | |
| 1120 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 490 |
| Thermal Conductivity, W/m-K | 46 | |
| 31 to 36 |
| Thermal Expansion, µm/m-K | 11 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.9 | |
| 8.8 to 9.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.9 | |
| 1.9 |
| Density, g/cm3 | 7.5 | |
| 7.1 to 7.5 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.5 |
| Embodied Energy, MJ/kg | 21 | |
| 21 |
| Embodied Water, L/kg | 44 | |
| 43 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 13 | |
| 17 to 80 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 27 | |
| 280 to 1330 |
| Stiffness to Weight: Axial, points | 13 | |
| 12 to 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 to 26 |
| Strength to Weight: Axial, points | 5.8 | |
| 17 to 35 |
| Strength to Weight: Bending, points | 8.7 | |
| 18 to 29 |
| Thermal Diffusivity, mm2/s | 13 | |
| 8.9 to 10 |
| Thermal Shock Resistance, points | 6.0 | |
| 17 to 35 |
Alloy Composition
| Carbon (C), % | 3.1 to 3.4 | |
| 3.0 to 3.5 |
| Iron (Fe), % | 92.1 to 93.9 | |
| 93.7 to 95.5 |
| Manganese (Mn), % | 0.5 to 0.7 | |
| 0 |
| Phosphorus (P), % | 0 to 0.9 | |
| 0 to 0.080 |
| Silicon (Si), % | 2.5 to 2.8 | |
| 1.5 to 2.8 |
| Sulfur (S), % | 0 to 0.15 | |
| 0 |