SAE-AISI 8645 Steel vs. SAE-AISI D4 Steel
Both SAE-AISI 8645 steel and SAE-AISI D4 steel are iron alloys. They have 85% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 8645 steel and the bottom bar is SAE-AISI D4 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 12 to 23 | |
| 8.4 to 15 |
| Fatigue Strength, MPa | 280 to 350 | |
| 310 to 920 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 74 |
| Shear Strength, MPa | 380 to 400 | |
| 460 to 1210 |
| Tensile Strength: Ultimate (UTS), MPa | 600 to 670 | |
| 760 to 2060 |
| Tensile Strength: Yield (Proof), MPa | 390 to 560 | |
| 470 to 1540 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 270 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1430 |
| Melting Onset (Solidus), °C | 1420 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 39 | |
| 31 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 4.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 5.0 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 8.0 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 3.3 |
| Embodied Energy, MJ/kg | 20 | |
| 49 |
| Embodied Water, L/kg | 50 | |
| 100 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 77 to 120 | |
| 100 to 160 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 21 to 24 | |
| 27 to 75 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 24 to 47 |
| Thermal Diffusivity, mm2/s | 10 | |
| 8.3 |
| Thermal Shock Resistance, points | 18 to 20 | |
| 23 to 63 |
Alloy Composition
| Carbon (C), % | 0.43 to 0.48 | |
| 2.1 to 2.4 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 11 to 13 |
| Copper (Cu), % | 0 | |
| 0 to 0.25 |
| Iron (Fe), % | 96.5 to 97.7 | |
| 80.6 to 86.3 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0 to 0.6 |
| Molybdenum (Mo), % | 0.15 to 0.25 | |
| 0.7 to 1.2 |
| Nickel (Ni), % | 0.4 to 0.7 | |
| 0 to 0.3 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.030 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.030 |
| Vanadium (V), % | 0 | |
| 0 to 1.0 |