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Class 3 Tungsten vs. R30012 Cobalt

Class 3 tungsten belongs to the otherwise unclassified metals classification, while R30012 cobalt belongs to the cobalt alloys. There are 25 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 class 3 tungsten and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 270
220
Elongation at Break, % 3.4
1.0
Poisson's Ratio 0.28
0.28
Rockwell C Hardness 30
48
Shear Modulus, GPa 100
86
Tensile Strength: Ultimate (UTS), MPa 830
830
Tensile Strength: Yield (Proof), MPa 580
650

Thermal Properties

Latent Heat of Fusion, J/g 170
320
Specific Heat Capacity, J/kg-K 120
440
Thermal Conductivity, W/m-K 30
15
Thermal Expansion, µm/m-K 4.5
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 15
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
1.8

Otherwise Unclassified Properties

Density, g/cm3 15
8.8
Embodied Carbon, kg CO2/kg material 23
8.3
Embodied Energy, MJ/kg 360
120
Embodied Water, L/kg 150
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 25
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 630
960
Stiffness to Weight: Axial, points 9.6
14
Stiffness to Weight: Bending, points 14
23
Strength to Weight: Axial, points 15
26
Strength to Weight: Bending, points 13
22
Thermal Diffusivity, mm2/s 15
3.8
Thermal Shock Resistance, points 49
23

Alloy Composition

Carbon (C), % 0
1.4 to 2.0
Chromium (Cr), % 0
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Iron (Fe), % 0
0 to 3.0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Silicon (Si), % 0
0 to 2.0
Tungsten (W), % 95
7.5 to 9.5
Residuals, % 5.0
0