Solder Alloy 721 vs. SAE-AISI S6 Steel
Solder alloy 721 belongs to the otherwise unclassified metals classification, while SAE-AISI S6 steel belongs to the iron alloys. There are 21 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 solder alloy 721 and the bottom bar is SAE-AISI S6 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 51 | |
| 190 |
| Poisson's Ratio | 0.36 | |
| 0.29 |
| Shear Modulus, GPa | 19 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 50 | |
| 670 to 1920 |
Thermal Properties
| Latent Heat of Fusion, J/g | 61 | |
| 290 |
| Melting Completion (Liquidus), °C | 220 | |
| 1430 |
| Melting Onset (Solidus), °C | 210 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 220 | |
| 480 |
| Thermal Conductivity, W/m-K | 56 | |
| 41 |
| Thermal Expansion, µm/m-K | 22 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 14 | |
| 7.6 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 17 | |
| 8.9 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.4 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 17 | |
| 2.3 |
| Embodied Energy, MJ/kg | 280 | |
| 33 |
Common Calculations
| Stiffness to Weight: Axial, points | 3.8 | |
| 13 |
| Stiffness to Weight: Bending, points | 17 | |
| 25 |
| Strength to Weight: Axial, points | 1.9 | |
| 24 to 70 |
| Strength to Weight: Bending, points | 4.1 | |
| 22 to 45 |
| Thermal Diffusivity, mm2/s | 34 | |
| 11 |
| Thermal Shock Resistance, points | 3.2 | |
| 22 to 64 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.0010 | |
| 0 |
| Antimony (Sb), % | 0 to 0.1 | |
| 0 |
| Arsenic (As), % | 0 to 0.030 | |
| 0 |
| Bismuth (Bi), % | 0.8 to 1.2 | |
| 0 |
| Cadmium (Cd), % | 0 to 0.0020 | |
| 0 |
| Carbon (C), % | 0 | |
| 0.4 to 0.5 |
| Chromium (Cr), % | 0 | |
| 1.2 to 1.5 |
| Copper (Cu), % | 0.3 to 0.7 | |
| 0 to 0.25 |
| Gold (Au), % | 0 to 0.050 | |
| 0 |
| Indium (In), % | 0 to 0.1 | |
| 0 |
| Iron (Fe), % | 0 to 0.020 | |
| 92.8 to 94.7 |
| Lead (Pb), % | 0 to 0.070 | |
| 0 |
| Manganese (Mn), % | 0 | |
| 1.2 to 1.5 |
| Molybdenum (Mo), % | 0 | |
| 0.3 to 0.5 |
| Nickel (Ni), % | 0 to 0.010 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 | |
| 2.0 to 2.5 |
| Silver (Ag), % | 2.3 to 2.7 | |
| 0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Tin (Sn), % | 95 to 96.6 | |
| 0 |
| Vanadium (V), % | 0 | |
| 0.2 to 0.4 |
| Zinc (Zn), % | 0 to 0.0010 | |
| 0 |