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Solder Alloy 702 vs. R30816 Cobalt

Solder alloy 702 belongs to the otherwise unclassified metals classification, while R30816 cobalt belongs to the cobalt alloys. There are 20 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 702 and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
210
Elongation at Break, % 21
23
Poisson's Ratio 0.36
0.3
Shear Modulus, GPa 19
81
Tensile Strength: Ultimate (UTS), MPa 53
1020

Thermal Properties

Latent Heat of Fusion, J/g 61
300
Melting Completion (Liquidus), °C 220
1540
Melting Onset (Solidus), °C 220
1460
Specific Heat Capacity, J/kg-K 220
420
Thermal Conductivity, W/m-K 62
13
Thermal Expansion, µm/m-K 22
12

Otherwise Unclassified Properties

Density, g/cm3 7.4
9.1
Embodied Carbon, kg CO2/kg material 17
20
Embodied Energy, MJ/kg 290
320

Common Calculations

Stiffness to Weight: Axial, points 3.8
13
Stiffness to Weight: Bending, points 17
22
Strength to Weight: Axial, points 2.0
31
Strength to Weight: Bending, points 4.2
25
Thermal Diffusivity, mm2/s 38
3.3
Thermal Shock Resistance, points 3.4
28

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 to 0.1
0
Cadmium (Cd), % 0 to 0.0020
0
Carbon (C), % 0
0.32 to 0.42
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 0 to 0.050
0
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0 to 5.0
Lead (Pb), % 0 to 0.070
0
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0 to 0.010
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Silver (Ag), % 2.8 to 3.2
0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tin (Sn), % 96.3 to 97.2
0
Tungsten (W), % 0
3.5 to 4.5
Zinc (Zn), % 0 to 0.0010
0