Hardened SAE-AISI H22 vs. Hardened SAE-AISI M3 Class 2
Both hardened SAE-AISI H22 and hardened SAE-AISI M3 class 2 are iron alloys. Both are furnished in the hardened (H) condition. They have 89% of their average alloy composition in common.
For each property being compared, the top bar is hardened SAE-AISI H22 and the bottom bar is hardened SAE-AISI M3 class 2.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Rockwell C Hardness | 59 | |
| 68 |
| Shear Modulus, GPa | 77 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 1920 | |
| 2210 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 260 |
| Melting Completion (Liquidus), °C | 1670 | |
| 1620 |
| Melting Onset (Solidus), °C | 1620 | |
| 1570 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 440 |
| Thermal Conductivity, W/m-K | 31 | |
| 26 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 28 | |
| 25 |
| Density, g/cm3 | 8.7 | |
| 8.3 |
| Embodied Carbon, kg CO2/kg material | 4.9 | |
| 12 |
| Embodied Energy, MJ/kg | 73 | |
| 180 |
| Embodied Water, L/kg | 72 | |
| 110 |
Common Calculations
| PREN (Pitting Resistance) | 21 | |
| 33 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 22 | |
| 23 |
| Strength to Weight: Axial, points | 61 | |
| 74 |
| Strength to Weight: Bending, points | 39 | |
| 45 |
| Thermal Diffusivity, mm2/s | 8.2 | |
| 7.2 |
| Thermal Shock Resistance, points | 60 | |
| 69 |
Alloy Composition
| Carbon (C), % | 0.3 to 0.4 | |
| 1.2 to 1.3 |
| Chromium (Cr), % | 1.8 to 3.8 | |
| 3.8 to 4.5 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 to 0.25 |
| Iron (Fe), % | 82.2 to 87.4 | |
| 75.8 to 82.3 |
| Manganese (Mn), % | 0.15 to 0.4 | |
| 0.15 to 0.4 |
| Molybdenum (Mo), % | 0 | |
| 4.8 to 6.5 |
| Nickel (Ni), % | 0 to 0.3 | |
| 0 to 0.3 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.030 |
| Silicon (Si), % | 0.15 to 0.4 | |
| 0.2 to 0.45 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tungsten (W), % | 10 to 11.8 | |
| 5.0 to 6.8 |
| Vanadium (V), % | 0.25 to 0.5 | |
| 2.8 to 3.8 |