ASTM B817 Type I vs. Austempered Cast Iron
ASTM B817 type I belongs to the titanium alloys classification, while austempered cast iron belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is ASTM B817 type I and the bottom bar is austempered cast iron.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 100 | |
| 180 |
| Elongation at Break, % | 4.0 to 13 | |
| 1.1 to 13 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Shear Modulus, GPa | 40 | |
| 62 to 69 |
| Tensile Strength: Ultimate (UTS), MPa | 770 to 960 | |
| 860 to 1800 |
| Tensile Strength: Yield (Proof), MPa | 700 to 860 | |
| 560 to 1460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 280 |
| Melting Completion (Liquidus), °C | 1600 | |
| 1380 |
| Melting Onset (Solidus), °C | 1550 | |
| 1340 |
| Specific Heat Capacity, J/kg-K | 560 | |
| 490 |
| Thermal Conductivity, W/m-K | 7.1 | |
| 42 |
| Thermal Expansion, µm/m-K | 9.6 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 36 | |
| 2.9 |
| Density, g/cm3 | 4.4 | |
| 7.5 |
| Embodied Carbon, kg CO2/kg material | 38 | |
| 1.8 |
| Embodied Energy, MJ/kg | 610 | |
| 25 |
| Embodied Water, L/kg | 200 | |
| 48 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 30 to 120 | |
| 19 to 95 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2310 to 3540 | |
| 880 to 3970 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 35 | |
| 25 |
| Strength to Weight: Axial, points | 48 to 60 | |
| 32 to 66 |
| Strength to Weight: Bending, points | 42 to 49 | |
| 27 to 44 |
| Thermal Diffusivity, mm2/s | 2.9 | |
| 11 |
| Thermal Shock Resistance, points | 54 to 68 | |
| 25 to 53 |
Alloy Composition
| Aluminum (Al), % | 5.5 to 6.8 | |
| 0 to 0.050 |
| Arsenic (As), % | 0 | |
| 0 to 0.020 |
| Carbon (C), % | 0 to 0.1 | |
| 3.4 to 3.8 |
| Chlorine (Cl), % | 0 to 0.2 | |
| 0 |
| Chromium (Cr), % | 0 | |
| 0 to 0.1 |
| Copper (Cu), % | 0 | |
| 0 to 0.8 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 89.6 to 94 |
| Magnesium (Mg), % | 0 | |
| 0 to 0.040 |
| Manganese (Mn), % | 0 | |
| 0.3 to 0.4 |
| Molybdenum (Mo), % | 0 | |
| 0 to 0.3 |
| Nickel (Ni), % | 0 | |
| 0 to 2.0 |
| Nitrogen (N), % | 0 to 0.040 | |
| 0 |
| Oxygen (O), % | 0 to 0.3 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Selenium (Se), % | 0 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.1 | |
| 2.3 to 2.7 |
| Sodium (Na), % | 0 to 0.2 | |
| 0 |
| Sulfur (S), % | 0 | |
| 0 to 0.020 |
| Tin (Sn), % | 0 | |
| 0 to 0.020 |
| Titanium (Ti), % | 87 to 91 | |
| 0 |
| Vanadium (V), % | 3.5 to 4.5 | |
| 0 to 0.1 |
| Residuals, % | 0 to 0.4 | |
| 0 |