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R30021 Cobalt vs. Grade VDC Steel

R30021 cobalt belongs to the cobalt alloys classification, while grade VDC steel belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is grade VDC steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 700
1700

Thermal Properties

Latent Heat of Fusion, J/g 330
250
Melting Completion (Liquidus), °C 1350
1450
Melting Onset (Solidus), °C 1190
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
51
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.1

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
1.4
Embodied Energy, MJ/kg 110
19
Embodied Water, L/kg 520
47

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
60
Strength to Weight: Bending, points 21
40
Thermal Diffusivity, mm2/s 3.8
14
Thermal Shock Resistance, points 21
50

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.6 to 0.75
Chromium (Cr), % 26 to 29
0 to 0.3
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.060
Iron (Fe), % 0 to 3.0
98.3 to 99.35
Manganese (Mn), % 0
0.5 to 1.0
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 1.5
0.15 to 0.3
Sulfur (S), % 0
0 to 0.020