Solder Alloy 121 vs. S81921 Stainless Steel
Solder alloy 121 belongs to the otherwise unclassified metals classification, while S81921 stainless steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is solder alloy 121 and the bottom bar is S81921 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 11 | |
| 260 |
| Elastic (Young's, Tensile) Modulus, GPa | 21 | |
| 200 |
| Elongation at Break, % | 25 | |
| 29 |
| Poisson's Ratio | 0.43 | |
| 0.28 |
| Shear Modulus, GPa | 7.5 | |
| 79 |
| Tensile Strength: Ultimate (UTS), MPa | 32 | |
| 710 |
Thermal Properties
| Latent Heat of Fusion, J/g | 29 | |
| 290 |
| Melting Completion (Liquidus), °C | 290 | |
| 1430 |
| Melting Onset (Solidus), °C | 230 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 140 | |
| 480 |
| Thermal Conductivity, W/m-K | 31 | |
| 15 |
| Thermal Expansion, µm/m-K | 28 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 8.8 | |
| 2.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 7.4 | |
| 2.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 14 |
| Density, g/cm3 | 11 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 5.6 | |
| 2.9 |
| Embodied Energy, MJ/kg | 93 | |
| 41 |
| Embodied Water, L/kg | 580 | |
| 150 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.1 | |
| 14 |
| Stiffness to Weight: Bending, points | 8.6 | |
| 25 |
| Strength to Weight: Axial, points | 0.84 | |
| 25 |
| Strength to Weight: Bending, points | 2.1 | |
| 23 |
| Thermal Diffusivity, mm2/s | 20 | |
| 4.0 |
| Thermal Shock Resistance, points | 3.9 | |
| 20 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.0010 | |
| 0 |
| Antimony (Sb), % | 0 to 0.5 | |
| 0 |
| Arsenic (As), % | 0 to 0.030 | |
| 0 |
| Bismuth (Bi), % | 0 to 0.25 | |
| 0 |
| Cadmium (Cd), % | 0 to 0.0050 | |
| 0 |
| Carbon (C), % | 0 | |
| 0 to 0.030 |
| Chromium (Cr), % | 0 | |
| 19 to 22 |
| Copper (Cu), % | 0 to 0.080 | |
| 0 |
| Gold (Au), % | 0 to 0.050 | |
| 0 |
| Indium (In), % | 0 to 0.1 | |
| 0 |
| Iron (Fe), % | 0 to 0.020 | |
| 66.7 to 75.9 |
| Lead (Pb), % | 83.4 to 85.5 | |
| 0 |
| Manganese (Mn), % | 0 | |
| 2.0 to 4.0 |
| Molybdenum (Mo), % | 0 | |
| 1.0 to 2.0 |
| Nickel (Ni), % | 0 to 0.010 | |
| 2.0 to 4.0 |
| Nitrogen (N), % | 0 | |
| 0.14 to 0.2 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Silver (Ag), % | 0 to 0.1 | |
| 0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Tin (Sn), % | 14.5 to 15.5 | |
| 0 |
| Zinc (Zn), % | 0 to 0.0010 | |
| 0 |