ASTM A372 Grade G Steel vs. Grade 20 Cast Iron
Both ASTM A372 grade G steel and grade 20 cast iron are iron alloys. They have a moderately high 94% 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 ASTM A372 grade G steel and the bottom bar is grade 20 cast iron.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 280 | |
| 160 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 180 |
| Elongation at Break, % | 20 to 22 | |
| 9.6 |
| Fatigue Strength, MPa | 310 to 380 | |
| 69 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 69 |
| Shear Strength, MPa | 410 to 570 | |
| 180 |
| Tensile Strength: Ultimate (UTS), MPa | 650 to 910 | |
| 160 |
| Tensile Strength: Yield (Proof), MPa | 430 to 550 | |
| 98 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 280 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1380 |
| Melting Onset (Solidus), °C | 1420 | |
| 1180 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 490 |
| Thermal Conductivity, W/m-K | 46 | |
| 46 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 8.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.2 | |
| 1.9 |
| Density, g/cm3 | 7.8 | |
| 7.5 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.5 |
| Embodied Energy, MJ/kg | 20 | |
| 21 |
| Embodied Water, L/kg | 49 | |
| 44 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 130 to 160 | |
| 13 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 500 to 810 | |
| 27 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 23 to 32 | |
| 5.8 |
| Strength to Weight: Bending, points | 21 to 27 | |
| 8.7 |
| Thermal Diffusivity, mm2/s | 13 | |
| 13 |
| Thermal Shock Resistance, points | 19 to 27 | |
| 6.0 |
Alloy Composition
| Carbon (C), % | 0.25 to 0.35 | |
| 3.1 to 3.4 |
| Chromium (Cr), % | 0.4 to 0.65 | |
| 0 |
| Iron (Fe), % | 97.4 to 98.4 | |
| 92.1 to 93.9 |
| Manganese (Mn), % | 0.7 to 1.0 | |
| 0.5 to 0.7 |
| Molybdenum (Mo), % | 0.15 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.9 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 2.5 to 2.8 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.15 |