ASTM A387 Grade 21 Steel vs. Austenitic Grey Cast Iron
Both ASTM A387 grade 21 steel and austenitic grey cast iron are iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is ASTM A387 grade 21 steel and the bottom bar is austenitic grey cast iron.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 150 to 180 | |
| 110 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 180 |
| Poisson's Ratio | 0.29 | |
| 0.29 to 0.3 |
| Shear Modulus, GPa | 74 | |
| 69 to 72 |
| Tensile Strength: Ultimate (UTS), MPa | 500 to 590 | |
| 150 to 230 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 280 to 350 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1340 to 1400 |
| Melting Onset (Solidus), °C | 1430 | |
| 1290 to 1350 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 to 490 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 to 14 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.1 | |
| 14 to 24 |
| Density, g/cm3 | 7.9 | |
| 7.7 to 8.1 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 3.1 to 4.7 |
| Embodied Energy, MJ/kg | 23 | |
| 43 to 65 |
| Embodied Water, L/kg | 62 | |
| 93 to 120 |
Common Calculations
| PREN (Pitting Resistance) | 6.4 | |
| 2.0 to 5.0 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 to 25 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 5.3 to 8.2 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 7.9 to 11 |
| Thermal Shock Resistance, points | 14 to 17 | |
| 4.5 to 6.5 |