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Solder Alloy 721 vs. SAE-AISI 4161 Steel

Solder alloy 721 belongs to the otherwise unclassified metals classification, while SAE-AISI 4161 steel belongs to the iron alloys. There are 22 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 721 and the bottom bar is SAE-AISI 4161 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
190
Elongation at Break, % 17
20
Poisson's Ratio 0.36
0.29
Shear Modulus, GPa 19
73
Tensile Strength: Ultimate (UTS), MPa 50
680

Thermal Properties

Latent Heat of Fusion, J/g 61
250
Melting Completion (Liquidus), °C 220
1460
Melting Onset (Solidus), °C 210
1410
Specific Heat Capacity, J/kg-K 220
470
Thermal Conductivity, W/m-K 56
43
Thermal Expansion, µm/m-K 22
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 17
8.4

Otherwise Unclassified Properties

Density, g/cm3 7.4
7.8
Embodied Carbon, kg CO2/kg material 17
1.5
Embodied Energy, MJ/kg 280
20

Common Calculations

Stiffness to Weight: Axial, points 3.8
13
Stiffness to Weight: Bending, points 17
24
Strength to Weight: Axial, points 1.9
24
Strength to Weight: Bending, points 4.1
22
Thermal Diffusivity, mm2/s 34
12
Thermal Shock Resistance, points 3.2
22

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
0.56 to 0.64
Chromium (Cr), % 0
0.7 to 0.9
Copper (Cu), % 0.3 to 0.7
0
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
96.7 to 97.6
Lead (Pb), % 0 to 0.070
0
Manganese (Mn), % 0
0.75 to 1.0
Molybdenum (Mo), % 0
0.25 to 0.35
Nickel (Ni), % 0 to 0.010
0
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0
0.15 to 0.35
Silver (Ag), % 2.3 to 2.7
0
Sulfur (S), % 0
0 to 0.040
Tin (Sn), % 95 to 96.6
0
Zinc (Zn), % 0 to 0.0010
0