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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