Annealed SAE-AISI O2 vs. Annealed SAE-AISI T8
Both annealed SAE-AISI O2 and annealed SAE-AISI T8 are iron alloys. Both are furnished in the annealed condition. They have 75% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is annealed SAE-AISI O2 and the bottom bar is annealed SAE-AISI T8.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 | |
| 240 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Rockwell B Hardness | 93 | |
| 100 |
| Shear Modulus, GPa | 72 | |
| 78 |
| Tensile Strength: Ultimate (UTS), MPa | 640 | |
| 780 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1730 |
| Melting Onset (Solidus), °C | 1410 | |
| 1670 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 420 |
| Thermal Conductivity, W/m-K | 43 | |
| 18 |
| Thermal Expansion, µm/m-K | 11 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.4 | |
| 45 |
| Density, g/cm3 | 7.8 | |
| 9.0 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 10 |
| Embodied Energy, MJ/kg | 26 | |
| 160 |
| Embodied Water, L/kg | 50 | |
| 120 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 12 |
| Stiffness to Weight: Bending, points | 24 | |
| 22 |
| Strength to Weight: Axial, points | 23 | |
| 24 |
| Strength to Weight: Bending, points | 21 | |
| 21 |
| Thermal Diffusivity, mm2/s | 12 | |
| 4.8 |
| Thermal Shock Resistance, points | 22 | |
| 24 |
Alloy Composition
| Carbon (C), % | 0.85 to 1.0 | |
| 0.75 to 0.85 |
| Chromium (Cr), % | 0 to 0.5 | |
| 3.8 to 4.5 |
| Cobalt (Co), % | 0 | |
| 4.3 to 5.8 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 to 0.25 |
| Iron (Fe), % | 95 to 97.8 | |
| 69.3 to 75.4 |
| Manganese (Mn), % | 1.4 to 1.8 | |
| 0.2 to 0.4 |
| Molybdenum (Mo), % | 0 to 0.3 | |
| 0.4 to 1.0 |
| Nickel (Ni), % | 0 to 0.3 | |
| 0 to 0.3 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.5 | |
| 0.2 to 0.4 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tungsten (W), % | 0 | |
| 13.3 to 14.8 |
| Vanadium (V), % | 0 to 0.3 | |
| 1.8 to 2.4 |