Hardened SAE-AISI O7 vs. Hardened SAE-AISI S4
Both hardened SAE-AISI O7 and hardened SAE-AISI S4 are iron alloys. Both are furnished in the hardened (H) condition. They have a very high 97% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.
For each property being compared, the top bar is hardened SAE-AISI O7 and the bottom bar is hardened SAE-AISI S4.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Rockwell C Hardness | 65 | |
| 66 |
| Shear Modulus, GPa | 73 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 2110 | |
| 2140 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 280 |
| Melting Completion (Liquidus), °C | 1480 | |
| 1430 |
| Melting Onset (Solidus), °C | 1430 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 41 | |
| 44 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.6 | |
| 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.7 | |
| 8.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 6.0 | |
| 2.2 |
| Density, g/cm3 | 7.9 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 2.3 | |
| 2.0 |
| Embodied Energy, MJ/kg | 33 | |
| 29 |
| Embodied Water, L/kg | 52 | |
| 48 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 74 | |
| 77 |
| Strength to Weight: Bending, points | 46 | |
| 48 |
| Thermal Diffusivity, mm2/s | 11 | |
| 12 |
| Thermal Shock Resistance, points | 70 | |
| 65 |
Alloy Composition
| Carbon (C), % | 1.1 to 1.3 | |
| 0.5 to 0.65 |
| Chromium (Cr), % | 0.35 to 0.85 | |
| 0.1 to 0.5 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 |
| Iron (Fe), % | 92.9 to 97.6 | |
| 95.2 to 96.9 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 0 to 0.3 | |
| 0 |
| Nickel (Ni), % | 0 to 0.3 | |
| 0 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.6 | |
| 1.8 to 2.3 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tungsten (W), % | 1.0 to 2.0 | |
| 0 |
| Vanadium (V), % | 0 to 0.4 | |
| 0.15 to 0.35 |