SAE-AISI 8740 Steel vs. ASTM B685 Alloy
SAE-AISI 8740 steel belongs to the iron alloys classification, while ASTM B685 alloy belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 8740 steel and the bottom bar is ASTM B685 alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 120 |
| Poisson's Ratio | 0.29 | |
| 0.37 |
| Shear Modulus, GPa | 73 | |
| 43 |
| Tensile Strength: Ultimate (UTS), MPa | 580 to 670 | |
| 660 to 1060 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 180 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1230 |
| Melting Onset (Solidus), °C | 1420 | |
| 1200 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 300 |
| Thermal Expansion, µm/m-K | 13 | |
| 14 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 5.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 4.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 11 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 6.1 |
| Stiffness to Weight: Bending, points | 24 | |
| 15 |
| Strength to Weight: Axial, points | 20 to 24 | |
| 17 to 27 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 16 to 21 |
| Thermal Shock Resistance, points | 17 to 20 | |
| 28 to 46 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.0050 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.050 |
| Carbon (C), % | 0.38 to 0.43 | |
| 0 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 0 |
| Copper (Cu), % | 0 | |
| 39.5 to 40.5 |
| Iron (Fe), % | 96.5 to 97.7 | |
| 0 to 0.050 |
| Lead (Pb), % | 0 | |
| 0 to 0.030 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0 |
| Nickel (Ni), % | 0.4 to 0.7 | |
| 0 |
| Palladium (Pd), % | 0 | |
| 59 to 60.5 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 |
| Silver (Ag), % | 0 | |
| 0 to 0.1 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0 to 0.060 |
| Residuals, % | 0 | |
| 0 to 0.2 |