Annealed SAE-AISI M4 vs. Annealed R30035 Cobalt
Annealed SAE-AISI M4 belongs to the iron alloys classification, while annealed R30035 cobalt belongs to the cobalt alloys. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is annealed SAE-AISI M4 and the bottom bar is annealed R30035 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 220 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Rockwell B Hardness | 100 | |
| 99 |
| Shear Modulus, GPa | 76 | |
| 84 |
| Tensile Strength: Ultimate (UTS), MPa | 770 | |
| 900 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 320 |
| Melting Completion (Liquidus), °C | 1610 | |
| 1440 |
| Melting Onset (Solidus), °C | 1560 | |
| 1320 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 440 |
| Thermal Conductivity, W/m-K | 25 | |
| 11 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 25 | |
| 100 |
| Density, g/cm3 | 8.3 | |
| 8.7 |
| Embodied Carbon, kg CO2/kg material | 14 | |
| 10 |
| Embodied Energy, MJ/kg | 210 | |
| 140 |
| Embodied Water, L/kg | 110 | |
| 410 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 23 |
| Strength to Weight: Axial, points | 26 | |
| 29 |
| Strength to Weight: Bending, points | 23 | |
| 24 |
| Thermal Diffusivity, mm2/s | 6.9 | |
| 3.0 |
| Thermal Shock Resistance, points | 24 | |
| 23 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.015 |
| Carbon (C), % | 1.3 to 1.4 | |
| 0 to 0.025 |
| Chromium (Cr), % | 3.8 to 4.8 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 29.1 to 39 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 |
| Iron (Fe), % | 75.9 to 81.4 | |
| 0 to 1.0 |
| Manganese (Mn), % | 0.15 to 0.4 | |
| 0 to 0.15 |
| Molybdenum (Mo), % | 4.3 to 5.5 | |
| 9.0 to 10.5 |
| Nickel (Ni), % | 0 to 0.3 | |
| 33 to 37 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.015 |
| Silicon (Si), % | 0.2 to 0.45 | |
| 0 to 0.15 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 | |
| 0 to 1.0 |
| Tungsten (W), % | 5.3 to 6.5 | |
| 0 |
| Vanadium (V), % | 3.8 to 4.5 | |
| 0 |