SAE-AISI H21 Steel vs. Automotive Grey Cast Iron
Both SAE-AISI H21 steel and automotive grey cast iron are iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI H21 steel and the bottom bar is automotive grey cast iron.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 180 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 76 | |
| 69 to 70 |
| Tensile Strength: Ultimate (UTS), MPa | 720 to 1790 | |
| 140 to 290 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 260 to 280 |
| Melting Completion (Liquidus), °C | 1630 | |
| 1380 to 1390 |
| Melting Onset (Solidus), °C | 1580 | |
| 1340 to 1350 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 490 |
| Thermal Conductivity, W/m-K | 27 | |
| 41 to 43 |
| Thermal Expansion, µm/m-K | 11 | |
| 12 to 14 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 23 | |
| 1.9 to 3.0 |
| Density, g/cm3 | 8.5 | |
| 7.5 to 7.6 |
| Embodied Carbon, kg CO2/kg material | 4.5 | |
| 1.5 to 1.7 |
| Embodied Energy, MJ/kg | 68 | |
| 21 to 24 |
| Embodied Water, L/kg | 72 | |
| 44 to 51 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 25 |
| Strength to Weight: Axial, points | 23 to 58 | |
| 5.2 to 11 |
| Strength to Weight: Bending, points | 21 to 38 | |
| 8.0 to 13 |
| Thermal Diffusivity, mm2/s | 7.1 | |
| 11 to 12 |
| Thermal Shock Resistance, points | 24 to 59 | |
| 4.2 to 8.6 |