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Solder Alloy 702 vs. R30003 Cobalt

Solder alloy 702 belongs to the otherwise unclassified metals classification, while R30003 cobalt belongs to the cobalt alloys. There are 22 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 702 and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
210
Elongation at Break, % 21
10 to 73
Poisson's Ratio 0.36
0.29
Shear Modulus, GPa 19
83
Tensile Strength: Ultimate (UTS), MPa 53
970 to 1720

Thermal Properties

Latent Heat of Fusion, J/g 61
310
Melting Completion (Liquidus), °C 220
1400
Melting Onset (Solidus), °C 220
1440
Specific Heat Capacity, J/kg-K 220
450
Thermal Conductivity, W/m-K 62
13
Thermal Expansion, µm/m-K 22
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 15
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 18
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.4
8.4
Embodied Carbon, kg CO2/kg material 17
8.0
Embodied Energy, MJ/kg 290
110

Common Calculations

Stiffness to Weight: Axial, points 3.8
14
Stiffness to Weight: Bending, points 17
24
Strength to Weight: Axial, points 2.0
32 to 57
Strength to Weight: Bending, points 4.2
26 to 38
Thermal Diffusivity, mm2/s 38
3.3
Thermal Shock Resistance, points 3.4
26 to 45

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
Boron (B), % 0
0 to 0.1
Cadmium (Cd), % 0 to 0.0020
0
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
39 to 41
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
10 to 20.5
Lead (Pb), % 0 to 0.070
0
Manganese (Mn), % 0
1.5 to 2.5
Molybdenum (Mo), % 0
6.0 to 8.0
Nickel (Ni), % 0 to 0.010
14 to 16
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0
0 to 1.2
Silver (Ag), % 2.8 to 3.2
0
Sulfur (S), % 0
0 to 0.015
Tin (Sn), % 96.3 to 97.2
0
Zinc (Zn), % 0 to 0.0010
0