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Z21721 Zinc vs. R30021 Cobalt

Z21721 zinc belongs to the zinc alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 26 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 Z21721 zinc and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 87
220
Elongation at Break, % 40
9.0
Poisson's Ratio 0.25
0.29
Shear Modulus, GPa 35
86
Tensile Strength: Ultimate (UTS), MPa 150
700
Tensile Strength: Yield (Proof), MPa 120
500

Thermal Properties

Latent Heat of Fusion, J/g 110
330
Melting Completion (Liquidus), °C 410
1350
Melting Onset (Solidus), °C 390
1190
Specific Heat Capacity, J/kg-K 390
450
Thermal Conductivity, W/m-K 110
15
Thermal Expansion, µm/m-K 26
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 37
2.1

Otherwise Unclassified Properties

Density, g/cm3 6.6
8.4
Embodied Carbon, kg CO2/kg material 2.8
8.0
Embodied Energy, MJ/kg 53
110
Embodied Water, L/kg 340
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
57
Resilience: Unit (Modulus of Resilience), kJ/m3 88
570
Stiffness to Weight: Axial, points 7.3
15
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 6.4
23
Strength to Weight: Bending, points 9.6
21
Thermal Diffusivity, mm2/s 44
3.8
Thermal Shock Resistance, points 4.8
21

Alloy Composition

Aluminum (Al), % 0 to 0.0020
0
Cadmium (Cd), % 0 to 0.070
0
Carbon (C), % 0
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 0 to 0.0050
0
Iron (Fe), % 0 to 0.010
0 to 3.0
Lead (Pb), % 0 to 1.0
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0
2.0 to 3.0
Silicon (Si), % 0
0 to 1.5
Titanium (Ti), % 0 to 0.020
0
Zinc (Zn), % 98.9 to 100
0