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Solder Alloy 704 vs. R30012 Cobalt

Solder alloy 704 belongs to the otherwise unclassified metals classification, while R30012 cobalt belongs to the cobalt alloys. There are 22 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is solder alloy 704 and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
220
Elongation at Break, % 30
1.0
Poisson's Ratio 0.36
0.28
Shear Modulus, GPa 19
86
Tensile Strength: Ultimate (UTS), MPa 55
830

Thermal Properties

Latent Heat of Fusion, J/g 62
320
Melting Completion (Liquidus), °C 240
1470
Melting Onset (Solidus), °C 220
1280
Specific Heat Capacity, J/kg-K 220
440
Thermal Conductivity, W/m-K 50
15
Thermal Expansion, µm/m-K 22
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 13
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 15
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.5
8.8
Embodied Carbon, kg CO2/kg material 19
8.3
Embodied Energy, MJ/kg 320
120

Common Calculations

Stiffness to Weight: Axial, points 3.8
14
Stiffness to Weight: Bending, points 17
23
Strength to Weight: Axial, points 2.1
26
Strength to Weight: Bending, points 4.3
22
Thermal Diffusivity, mm2/s 30
3.8
Thermal Shock Resistance, points 3.5
23

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
1.4 to 2.0
Chromium (Cr), % 0
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
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 3.0
Lead (Pb), % 0 to 0.070
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0 to 0.010
0 to 3.0
Silicon (Si), % 0
0 to 2.0
Silver (Ag), % 4.8 to 5.2
0
Tin (Sn), % 94.3 to 95.2
0
Tungsten (W), % 0
7.5 to 9.5
Zinc (Zn), % 0 to 0.0010
0