Grade 20 Cast Iron vs. Zamak 7
Grade 20 cast iron belongs to the iron alloys classification, while Zamak 7 belongs to the zinc alloys. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is grade 20 cast iron and the bottom bar is Zamak 7.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 160 | |
| 80 |
| Compressive (Crushing) Strength, MPa | 570 | |
| 410 |
| Elastic (Young's, Tensile) Modulus, GPa | 180 | |
| 86 |
| Elongation at Break, % | 9.6 | |
| 13 |
| Fatigue Strength, MPa | 69 | |
| 47 |
| Poisson's Ratio | 0.29 | |
| 0.25 |
| Shear Modulus, GPa | 69 | |
| 33 |
| Shear Strength, MPa | 180 | |
| 210 |
| Tensile Strength: Ultimate (UTS), MPa | 160 | |
| 280 |
| Tensile Strength: Yield (Proof), MPa | 98 | |
| 250 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 120 |
| Melting Completion (Liquidus), °C | 1380 | |
| 390 |
| Melting Onset (Solidus), °C | 1180 | |
| 380 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 410 |
| Thermal Conductivity, W/m-K | 46 | |
| 110 |
| Thermal Expansion, µm/m-K | 11 | |
| 27 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 27 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.9 | |
| 38 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.9 | |
| 11 |
| Density, g/cm3 | 7.5 | |
| 6.4 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 3.0 |
| Embodied Energy, MJ/kg | 21 | |
| 57 |
| Embodied Water, L/kg | 44 | |
| 380 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 13 | |
| 36 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 27 | |
| 370 |
| Stiffness to Weight: Axial, points | 13 | |
| 7.5 |
| Stiffness to Weight: Bending, points | 25 | |
| 23 |
| Strength to Weight: Axial, points | 5.8 | |
| 12 |
| Strength to Weight: Bending, points | 8.7 | |
| 15 |
| Thermal Diffusivity, mm2/s | 13 | |
| 43 |
| Thermal Shock Resistance, points | 6.0 | |
| 8.6 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 3.5 to 4.3 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.0020 |
| Carbon (C), % | 3.1 to 3.4 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.25 |
| Iron (Fe), % | 92.1 to 93.9 | |
| 0 to 0.075 |
| Lead (Pb), % | 0 | |
| 0 to 0.0030 |
| Magnesium (Mg), % | 0 | |
| 0.0050 to 0.020 |
| Manganese (Mn), % | 0.5 to 0.7 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 0.0050 to 0.020 |
| Phosphorus (P), % | 0 to 0.9 | |
| 0 |
| Silicon (Si), % | 2.5 to 2.8 | |
| 0 |
| Sulfur (S), % | 0 to 0.15 | |
| 0 |
| Tin (Sn), % | 0 | |
| 0 to 0.0010 |
| Zinc (Zn), % | 0 | |
| 95.3 to 96.5 |