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Solder Alloy 704 vs. R30605 Cobalt

Solder alloy 704 belongs to the otherwise unclassified metals classification, while R30605 cobalt belongs to the cobalt alloys. There are 22 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is solder alloy 704 and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
210
Elongation at Break, % 30
34
Poisson's Ratio 0.36
0.29
Shear Modulus, GPa 19
81
Tensile Strength: Ultimate (UTS), MPa 55
1130 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 62
290
Melting Completion (Liquidus), °C 240
1410
Melting Onset (Solidus), °C 220
1330
Specific Heat Capacity, J/kg-K 220
410
Thermal Conductivity, W/m-K 50
9.6
Thermal Expansion, µm/m-K 22
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 13
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 15
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.5
9.6
Embodied Carbon, kg CO2/kg material 19
9.8
Embodied Energy, MJ/kg 320
140

Common Calculations

Stiffness to Weight: Axial, points 3.8
12
Stiffness to Weight: Bending, points 17
21
Strength to Weight: Axial, points 2.1
33 to 55
Strength to Weight: Bending, points 4.3
25 to 36
Thermal Diffusivity, mm2/s 30
2.5
Thermal Shock Resistance, points 3.5
31 to 52

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
0.050 to 0.15
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
46.4 to 57
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
Manganese (Mn), % 0
1.0 to 2.0
Nickel (Ni), % 0 to 0.010
9.0 to 11
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 0.4
Silver (Ag), % 4.8 to 5.2
0
Sulfur (S), % 0
0 to 0.030
Tin (Sn), % 94.3 to 95.2
0
Tungsten (W), % 0
14 to 16
Zinc (Zn), % 0 to 0.0010
0