Grade 20 Cast Iron vs. ASTM Grade HD Steel
Both grade 20 cast iron and ASTM grade HD steel are iron alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have 66% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is grade 20 cast iron and the bottom bar is ASTM grade HD steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 180 | |
| 200 |
| Elongation at Break, % | 9.6 | |
| 9.1 |
| Fatigue Strength, MPa | 69 | |
| 140 |
| Poisson's Ratio | 0.29 | |
| 0.27 |
| Shear Modulus, GPa | 69 | |
| 80 |
| Tensile Strength: Ultimate (UTS), MPa | 160 | |
| 590 |
| Tensile Strength: Yield (Proof), MPa | 98 | |
| 270 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 310 |
| Melting Completion (Liquidus), °C | 1380 | |
| 1410 |
| Melting Onset (Solidus), °C | 1180 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 490 |
| Thermal Conductivity, W/m-K | 46 | |
| 16 |
| Thermal Expansion, µm/m-K | 11 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 2.1 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.9 | |
| 2.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.9 | |
| 17 |
| Density, g/cm3 | 7.5 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 3.1 |
| Embodied Energy, MJ/kg | 21 | |
| 45 |
| Embodied Water, L/kg | 44 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 13 | |
| 44 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 27 | |
| 180 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 25 | |
| 26 |
| Strength to Weight: Axial, points | 5.8 | |
| 21 |
| Strength to Weight: Bending, points | 8.7 | |
| 20 |
| Thermal Diffusivity, mm2/s | 13 | |
| 4.3 |
| Thermal Shock Resistance, points | 6.0 | |
| 19 |
Alloy Composition
| Carbon (C), % | 3.1 to 3.4 | |
| 0 to 0.5 |
| Chromium (Cr), % | 0 | |
| 26 to 30 |
| Iron (Fe), % | 92.1 to 93.9 | |
| 58.4 to 70 |
| Manganese (Mn), % | 0.5 to 0.7 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 0 | |
| 0 to 0.5 |
| Nickel (Ni), % | 0 | |
| 4.0 to 7.0 |
| Phosphorus (P), % | 0 to 0.9 | |
| 0 to 0.040 |
| Silicon (Si), % | 2.5 to 2.8 | |
| 0 to 2.0 |
| Sulfur (S), % | 0 to 0.15 | |
| 0 to 0.040 |