Annealed SAE-AISI O1 vs. Annealed SAE-AISI O2
Both annealed SAE-AISI O1 and annealed SAE-AISI O2 are iron alloys. Both are furnished in the annealed condition. Their average alloy composition is basically identical.
For each property being compared, the top bar is annealed SAE-AISI O1 and the bottom bar is annealed SAE-AISI O2.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 | |
| 190 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 20 | |
| 22 |
| Fatigue Strength, MPa | 280 | |
| 260 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Rockwell B Hardness | 93 | |
| 93 |
| Shear Modulus, GPa | 72 | |
| 72 |
| Shear Strength, MPa | 400 | |
| 410 |
| Tensile Strength: Ultimate (UTS), MPa | 640 | |
| 640 |
| Tensile Strength: Yield (Proof), MPa | 400 | |
| 370 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1450 |
| Melting Onset (Solidus), °C | 1420 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 43 | |
| 43 |
| Thermal Expansion, µm/m-K | 12 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.5 | |
| 8.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.4 | |
| 2.4 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.9 | |
| 1.8 |
| Embodied Energy, MJ/kg | 27 | |
| 26 |
| Embodied Water, L/kg | 51 | |
| 50 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 440 | |
| 370 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 23 | |
| 23 |
| Strength to Weight: Bending, points | 21 | |
| 21 |
| Thermal Diffusivity, mm2/s | 12 | |
| 12 |
| Thermal Shock Resistance, points | 21 | |
| 22 |
Alloy Composition
| Carbon (C), % | 0.85 to 1.0 | |
| 0.85 to 1.0 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 0 to 0.5 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 to 0.25 |
| Iron (Fe), % | 95 to 97.4 | |
| 95 to 97.8 |
| Manganese (Mn), % | 1.0 to 1.4 | |
| 1.4 to 1.8 |
| Molybdenum (Mo), % | 0 | |
| 0 to 0.3 |
| 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 to 0.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tungsten (W), % | 0.4 to 0.6 | |
| 0 |
| Vanadium (V), % | 0 to 0.3 | |
| 0 to 0.3 |