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Solder Alloy 137 vs. R31538 Cobalt

Solder alloy 137 belongs to the otherwise unclassified metals classification, while R31538 cobalt belongs to the cobalt alloys. There are 23 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is solder alloy 137 and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 24
220
Elongation at Break, % 19
13 to 23
Poisson's Ratio 0.42
0.29
Shear Modulus, GPa 8.3
86
Tensile Strength: Ultimate (UTS), MPa 34
1020 to 1360

Thermal Properties

Latent Heat of Fusion, J/g 33
320
Melting Completion (Liquidus), °C 270
1360
Melting Onset (Solidus), °C 190
1290
Specific Heat Capacity, J/kg-K 150
450
Thermal Conductivity, W/m-K 38
13
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 7.7
2.1

Otherwise Unclassified Properties

Density, g/cm3 10
8.4
Embodied Carbon, kg CO2/kg material 6.3
8.1
Embodied Energy, MJ/kg 100
110
Embodied Water, L/kg 660
530

Common Calculations

Stiffness to Weight: Axial, points 1.3
15
Stiffness to Weight: Bending, points 9.2
24
Strength to Weight: Axial, points 0.9
34 to 45
Strength to Weight: Bending, points 2.2
27 to 32
Thermal Diffusivity, mm2/s 25
3.5
Thermal Shock Resistance, points 3.7
25 to 33

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0
Antimony (Sb), % 0.5 to 3.0
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
0.15 to 0.35
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
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
0 to 0.75
Lead (Pb), % 75.9 to 80
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0 to 0.010
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Silicon (Si), % 0
0 to 1.0
Silver (Ag), % 0 to 0.1
0
Tin (Sn), % 19.5 to 20.5
0
Zinc (Zn), % 0 to 0.0010
0