ASTM Grade HD Steel vs. Austempered Cast Iron
Both ASTM grade HD steel and austempered cast iron are iron alloys. They have 67% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is ASTM grade HD steel and the bottom bar is austempered cast iron.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 180 |
| Elongation at Break, % | 9.1 | |
| 1.1 to 13 |
| Poisson's Ratio | 0.27 | |
| 0.29 |
| Shear Modulus, GPa | 80 | |
| 62 to 69 |
| Tensile Strength: Ultimate (UTS), MPa | 590 | |
| 860 to 1800 |
| Tensile Strength: Yield (Proof), MPa | 270 | |
| 560 to 1460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 280 |
| Melting Completion (Liquidus), °C | 1410 | |
| 1380 |
| Melting Onset (Solidus), °C | 1370 | |
| 1340 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 490 |
| Thermal Conductivity, W/m-K | 16 | |
| 42 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 17 | |
| 2.9 |
| Density, g/cm3 | 7.7 | |
| 7.5 |
| Embodied Carbon, kg CO2/kg material | 3.1 | |
| 1.8 |
| Embodied Energy, MJ/kg | 45 | |
| 25 |
| Embodied Water, L/kg | 180 | |
| 48 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 44 | |
| 19 to 95 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 180 | |
| 880 to 3970 |
| Stiffness to Weight: Axial, points | 15 | |
| 13 |
| Stiffness to Weight: Bending, points | 26 | |
| 25 |
| Strength to Weight: Axial, points | 21 | |
| 32 to 66 |
| Strength to Weight: Bending, points | 20 | |
| 27 to 44 |
| Thermal Diffusivity, mm2/s | 4.3 | |
| 11 |
| Thermal Shock Resistance, points | 19 | |
| 25 to 53 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.050 |
| Arsenic (As), % | 0 | |
| 0 to 0.020 |
| Carbon (C), % | 0 to 0.5 | |
| 3.4 to 3.8 |
| Chromium (Cr), % | 26 to 30 | |
| 0 to 0.1 |
| Copper (Cu), % | 0 | |
| 0 to 0.8 |
| Iron (Fe), % | 58.4 to 70 | |
| 89.6 to 94 |
| Magnesium (Mg), % | 0 | |
| 0 to 0.040 |
| Manganese (Mn), % | 0 to 1.5 | |
| 0.3 to 0.4 |
| Molybdenum (Mo), % | 0 to 0.5 | |
| 0 to 0.3 |
| Nickel (Ni), % | 4.0 to 7.0 | |
| 0 to 2.0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Selenium (Se), % | 0 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 2.0 | |
| 2.3 to 2.7 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.020 |
| Tin (Sn), % | 0 | |
| 0 to 0.020 |
| Vanadium (V), % | 0 | |
| 0 to 0.1 |