ASTM A356 Grade 9 vs. Grade 20 Cast Iron
Both ASTM A356 grade 9 and grade 20 cast iron are iron alloys. They have a moderately high 94% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is ASTM A356 grade 9 and the bottom bar is grade 20 cast iron.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 | |
| 160 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 180 |
| Elongation at Break, % | 17 | |
| 9.6 |
| Fatigue Strength, MPa | 310 | |
| 69 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 69 |
| Tensile Strength: Ultimate (UTS), MPa | 670 | |
| 160 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 98 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 280 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1380 |
| Melting Onset (Solidus), °C | 1430 | |
| 1180 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 490 |
| Thermal Conductivity, W/m-K | 41 | |
| 46 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.5 | |
| 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 8.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.6 | |
| 1.9 |
| Density, g/cm3 | 7.8 | |
| 7.5 |
| Embodied Carbon, kg CO2/kg material | 2.4 | |
| 1.5 |
| Embodied Energy, MJ/kg | 33 | |
| 21 |
| Embodied Water, L/kg | 56 | |
| 44 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 100 | |
| 13 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 570 | |
| 27 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 24 | |
| 5.8 |
| Strength to Weight: Bending, points | 22 | |
| 8.7 |
| Thermal Diffusivity, mm2/s | 11 | |
| 13 |
| Thermal Shock Resistance, points | 19 | |
| 6.0 |
Alloy Composition
| Carbon (C), % | 0 to 0.2 | |
| 3.1 to 3.4 |
| Chromium (Cr), % | 1.0 to 1.5 | |
| 0 |
| Iron (Fe), % | 95.2 to 97.2 | |
| 92.1 to 93.9 |
| Manganese (Mn), % | 0.5 to 0.9 | |
| 0.5 to 0.7 |
| Molybdenum (Mo), % | 0.9 to 1.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.9 |
| Silicon (Si), % | 0.2 to 0.6 | |
| 2.5 to 2.8 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.15 |
| Vanadium (V), % | 0.2 to 0.35 | |
| 0 |