Annealed SAE-AISI M3 Class 2 vs. Annealed SAE-AISI M4
Both annealed SAE-AISI M3 class 2 and annealed SAE-AISI M4 are iron alloys. Both are furnished in the annealed condition. Their average alloy composition is basically identical. There are 23 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 annealed SAE-AISI M3 class 2 and the bottom bar is annealed SAE-AISI M4.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 230 | |
| 230 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 76 |
| Tensile Strength: Ultimate (UTS), MPa | 770 | |
| 770 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 260 |
| Melting Completion (Liquidus), °C | 1620 | |
| 1610 |
| Melting Onset (Solidus), °C | 1570 | |
| 1560 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 440 |
| Thermal Conductivity, W/m-K | 26 | |
| 25 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 25 | |
| 25 |
| Density, g/cm3 | 8.3 | |
| 8.3 |
| Embodied Carbon, kg CO2/kg material | 12 | |
| 14 |
| Embodied Energy, MJ/kg | 180 | |
| 210 |
| Embodied Water, L/kg | 110 | |
| 110 |
Common Calculations
| PREN (Pitting Resistance) | 33 | |
| 30 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 23 |
| Strength to Weight: Axial, points | 26 | |
| 26 |
| Strength to Weight: Bending, points | 22 | |
| 23 |
| Thermal Diffusivity, mm2/s | 7.2 | |
| 6.9 |
| Thermal Shock Resistance, points | 24 | |
| 24 |
Alloy Composition
| Carbon (C), % | 1.2 to 1.3 | |
| 1.3 to 1.4 |
| Chromium (Cr), % | 3.8 to 4.5 | |
| 3.8 to 4.8 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 to 0.25 |
| Iron (Fe), % | 75.8 to 82.3 | |
| 75.9 to 81.4 |
| Manganese (Mn), % | 0.15 to 0.4 | |
| 0.15 to 0.4 |
| Molybdenum (Mo), % | 4.8 to 6.5 | |
| 4.3 to 5.5 |
| Nickel (Ni), % | 0 to 0.3 | |
| 0 to 0.3 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.030 |
| Silicon (Si), % | 0.2 to 0.45 | |
| 0.2 to 0.45 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tungsten (W), % | 5.0 to 6.8 | |
| 5.3 to 6.5 |
| Vanadium (V), % | 2.8 to 3.8 | |
| 3.8 to 4.5 |