SAE-AISI 8620 Steel vs. Ductile Cast Iron
Both SAE-AISI 8620 steel and ductile cast iron are iron alloys. They have a very high 95% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 8620 steel and the bottom bar is ductile cast iron.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 150 to 210 | |
| 160 to 310 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 170 to 180 |
| Elongation at Break, % | 13 to 31 | |
| 2.1 to 20 |
| Poisson's Ratio | 0.29 | |
| 0.28 to 0.31 |
| Shear Modulus, GPa | 73 | |
| 64 to 70 |
| Shear Strength, MPa | 340 to 420 | |
| 420 to 800 |
| Tensile Strength: Ultimate (UTS), MPa | 520 to 690 | |
| 460 to 920 |
| Tensile Strength: Yield (Proof), MPa | 360 to 570 | |
| 310 to 670 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 270 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 290 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1160 |
| Melting Onset (Solidus), °C | 1420 | |
| 1120 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 490 |
| Thermal Conductivity, W/m-K | 39 | |
| 31 to 36 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 8.8 to 9.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 1.9 |
| Density, g/cm3 | 7.8 | |
| 7.1 to 7.5 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.5 |
| Embodied Energy, MJ/kg | 20 | |
| 21 |
| Embodied Water, L/kg | 50 | |
| 43 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 86 to 150 | |
| 17 to 80 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 340 to 880 | |
| 280 to 1330 |
| Stiffness to Weight: Axial, points | 13 | |
| 12 to 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 to 26 |
| Strength to Weight: Axial, points | 18 to 24 | |
| 17 to 35 |
| Strength to Weight: Bending, points | 18 to 22 | |
| 18 to 29 |
| Thermal Diffusivity, mm2/s | 10 | |
| 8.9 to 10 |
| Thermal Shock Resistance, points | 15 to 20 | |
| 17 to 35 |
Alloy Composition
| Carbon (C), % | 0.18 to 0.23 | |
| 3.0 to 3.5 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 0 |
| Iron (Fe), % | 96.9 to 98 | |
| 93.7 to 95.5 |
| Manganese (Mn), % | 0.7 to 0.9 | |
| 0 |
| Molybdenum (Mo), % | 0.15 to 0.25 | |
| 0 |
| Nickel (Ni), % | 0.4 to 0.7 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.080 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 1.5 to 2.8 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 |