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Solder Alloy 121 vs. SAE-AISI T8 Steel

Solder alloy 121 belongs to the otherwise unclassified metals classification, while SAE-AISI T8 steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is solder alloy 121 and the bottom bar is SAE-AISI T8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 21
200
Poisson's Ratio 0.43
0.29
Shear Modulus, GPa 7.5
78
Tensile Strength: Ultimate (UTS), MPa 32
780 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 29
250
Melting Completion (Liquidus), °C 290
1730
Melting Onset (Solidus), °C 230
1670
Specific Heat Capacity, J/kg-K 140
420
Thermal Conductivity, W/m-K 31
18
Thermal Expansion, µm/m-K 28
12

Otherwise Unclassified Properties

Base Metal Price, % relative 80
45
Density, g/cm3 11
9.0
Embodied Carbon, kg CO2/kg material 5.6
10
Embodied Energy, MJ/kg 93
160
Embodied Water, L/kg 580
120

Common Calculations

Stiffness to Weight: Axial, points 1.1
12
Stiffness to Weight: Bending, points 8.6
22
Strength to Weight: Axial, points 0.84
24 to 66
Strength to Weight: Bending, points 2.1
21 to 41
Thermal Diffusivity, mm2/s 20
4.8
Thermal Shock Resistance, points 3.9
24 to 66

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
0.75 to 0.85
Chromium (Cr), % 0
3.8 to 4.5
Cobalt (Co), % 0
4.3 to 5.8
Copper (Cu), % 0 to 0.080
0 to 0.25
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
69.3 to 75.4
Lead (Pb), % 83.4 to 85.5
0
Manganese (Mn), % 0
0.2 to 0.4
Molybdenum (Mo), % 0
0.4 to 1.0
Nickel (Ni), % 0 to 0.010
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0
0.2 to 0.4
Silver (Ag), % 0 to 0.1
0
Sulfur (S), % 0
0 to 0.030
Tin (Sn), % 14.5 to 15.5
0
Tungsten (W), % 0
13.3 to 14.8
Vanadium (V), % 0
1.8 to 2.4
Zinc (Zn), % 0 to 0.0010
0