SAE-AISI 8645 Steel vs. ASTM A387 Grade 5 Steel
Both SAE-AISI 8645 steel and ASTM A387 grade 5 steel are iron alloys. They have a very high 95% of their average alloy composition in common. There are 31 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 SAE-AISI 8645 steel and the bottom bar is ASTM A387 grade 5 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 180 to 200 | |
| 150 to 180 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 12 to 23 | |
| 20 to 21 |
| Fatigue Strength, MPa | 280 to 350 | |
| 160 to 240 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 74 |
| Shear Strength, MPa | 380 to 400 | |
| 310 to 380 |
| Tensile Strength: Ultimate (UTS), MPa | 600 to 670 | |
| 500 to 600 |
| Tensile Strength: Yield (Proof), MPa | 390 to 560 | |
| 230 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 260 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 510 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1460 |
| Melting Onset (Solidus), °C | 1420 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 39 | |
| 40 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 8.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 9.2 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 4.3 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.7 |
| Embodied Energy, MJ/kg | 20 | |
| 23 |
| Embodied Water, L/kg | 50 | |
| 69 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 77 to 120 | |
| 83 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 420 to 840 | |
| 140 to 320 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 21 to 24 | |
| 18 to 21 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 18 to 20 |
| Thermal Diffusivity, mm2/s | 10 | |
| 11 |
| Thermal Shock Resistance, points | 18 to 20 | |
| 14 to 17 |
Alloy Composition
| Carbon (C), % | 0.43 to 0.48 | |
| 0 to 0.15 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 4.0 to 6.0 |
| Iron (Fe), % | 96.5 to 97.7 | |
| 92.1 to 95.3 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 0.15 to 0.25 | |
| 0.45 to 0.65 |
| Nickel (Ni), % | 0.4 to 0.7 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.025 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.025 |